Cerus Corp NASDAQ:CERS Historical Prices

Below are the 6816 trading days of historical prices for CERS.

#	Exchange	Symbol	Date	Open	High	Low	Close
6816	NASDAQ	CERS	Thu, Mar 7, 2024	2.50	2.59	2.40	2.43
6815	NASDAQ	CERS	Wed, Mar 6, 2024	2.14	2.58	2.13	2.42
6814	NASDAQ	CERS	Tue, Mar 5, 2024	2.10	2.12	1.98	1.99
6813	NASDAQ	CERS	Mon, Mar 4, 2024	2.15	2.17	2.01	2.12
6812	NASDAQ	CERS	Fri, Mar 1, 2024	2.18	2.24	2.14	2.18
6811	NASDAQ	CERS	Thu, Feb 29, 2024	2.27	2.30	2.17	2.18
6810	NASDAQ	CERS	Wed, Feb 28, 2024	2.26	2.27	2.19	2.20
6809	NASDAQ	CERS	Tue, Feb 27, 2024	2.26	2.29	2.20	2.28
6808	NASDAQ	CERS	Mon, Feb 26, 2024	2.18	2.27	2.11	2.21
6807	NASDAQ	CERS	Fri, Feb 23, 2024	2.20	2.30	2.15	2.21
6806	NASDAQ	CERS	Thu, Feb 22, 2024	2.24	2.32	2.17	2.22
6805	NASDAQ	CERS	Wed, Feb 21, 2024	2.27	2.30	2.21	2.24
6804	NASDAQ	CERS	Tue, Feb 20, 2024	2.29	2.37	2.22	2.31
6803	NASDAQ	CERS	Fri, Feb 16, 2024	2.36	2.43	2.29	2.36
6802	NASDAQ	CERS	Thu, Feb 15, 2024	2.37	2.43	2.32	2.39
6801	NASDAQ	CERS	Wed, Feb 14, 2024	2.24	2.36	2.23	2.33
6800	NASDAQ	CERS	Tue, Feb 13, 2024	2.26	2.31	2.10	2.17
6799	NASDAQ	CERS	Mon, Feb 12, 2024	2.40	2.42	2.32	2.37
6798	NASDAQ	CERS	Fri, Feb 9, 2024	2.35	2.40	2.29	2.36
6797	NASDAQ	CERS	Thu, Feb 8, 2024	2.20	2.34	2.18	2.30
6796	NASDAQ	CERS	Wed, Feb 7, 2024	2.22	2.32	2.19	2.20
6795	NASDAQ	CERS	Tue, Feb 6, 2024	1.88	2.24	1.88	2.23
6794	NASDAQ	CERS	Mon, Feb 5, 2024	1.89	1.98	1.88	1.88
6793	NASDAQ	CERS	Fri, Feb 2, 2024	1.98	1.98	1.90	1.95
6792	NASDAQ	CERS	Thu, Feb 1, 2024	1.87	1.98	1.84	1.97
6791	NASDAQ	CERS	Wed, Jan 31, 2024	1.90	1.95	1.81	1.81
6790	NASDAQ	CERS	Tue, Jan 30, 2024	2.09	2.11	1.89	1.91
6789	NASDAQ	CERS	Mon, Jan 29, 2024	1.92	2.08	1.90	2.07
6788	NASDAQ	CERS	Fri, Jan 26, 2024	1.87	1.99	1.85	1.87
6787	NASDAQ	CERS	Thu, Jan 25, 2024	1.83	1.88	1.78	1.84
6786	NASDAQ	CERS	Wed, Jan 24, 2024	1.85	1.91	1.79	1.80
6785	NASDAQ	CERS	Tue, Jan 23, 2024	1.83	1.88	1.80	1.84
6784	NASDAQ	CERS	Mon, Jan 22, 2024	1.81	1.89	1.77	1.80
6783	NASDAQ	CERS	Fri, Jan 19, 2024	1.71	1.77	1.65	1.76
6782	NASDAQ	CERS	Thu, Jan 18, 2024	1.70	1.71	1.64	1.69
6781	NASDAQ	CERS	Wed, Jan 17, 2024	1.68	1.69	1.64	1.66
6780	NASDAQ	CERS	Tue, Jan 16, 2024	1.65	1.69	1.59	1.67
6779	NASDAQ	CERS	Fri, Jan 12, 2024	1.84	1.90	1.69	1.70
6778	NASDAQ	CERS	Thu, Jan 11, 2024	2.00	2.03	1.76	1.82
6777	NASDAQ	CERS	Wed, Jan 10, 2024	2.03	2.08	1.99	2.02
6776	NASDAQ	CERS	Tue, Jan 9, 2024	2.02	2.11	2.02	2.04
6775	NASDAQ	CERS	Mon, Jan 8, 2024	1.99	2.09	1.95	2.07
6774	NASDAQ	CERS	Fri, Jan 5, 2024	2.00	2.05	1.95	1.96
6773	NASDAQ	CERS	Thu, Jan 4, 2024	2.05	2.09	2.02	2.03
6772	NASDAQ	CERS	Wed, Jan 3, 2024	2.09	2.12	2.02	2.03
6771	NASDAQ	CERS	Tue, Jan 2, 2024	2.13	2.24	2.07	2.16
6770	NASDAQ	CERS	Fri, Dec 29, 2023	2.25	2.31	2.15	2.16
6769	NASDAQ	CERS	Thu, Dec 28, 2023	2.27	2.27	2.15	2.26
6768	NASDAQ	CERS	Wed, Dec 27, 2023	2.30	2.36	2.26	2.30
6767	NASDAQ	CERS	Tue, Dec 26, 2023	2.28	2.32	2.22	2.25
6766	NASDAQ	CERS	Fri, Dec 22, 2023	2.24	2.31	2.18	2.25
6765	NASDAQ	CERS	Thu, Dec 21, 2023	2.16	2.27	2.15	2.23
6764	NASDAQ	CERS	Wed, Dec 20, 2023	2.35	2.40	2.09	2.11
6763	NASDAQ	CERS	Tue, Dec 19, 2023	2.11	2.37	2.08	2.35
6762	NASDAQ	CERS	Mon, Dec 18, 2023	2.13	2.18	2.06	2.09
6761	NASDAQ	CERS	Fri, Dec 15, 2023	2.09	2.20	2.03	2.14
6760	NASDAQ	CERS	Thu, Dec 14, 2023	1.84	2.13	1.84	2.06
6759	NASDAQ	CERS	Wed, Dec 13, 2023	1.66	1.81	1.60	1.81
6758	NASDAQ	CERS	Tue, Dec 12, 2023	1.69	1.70	1.64	1.66
6757	NASDAQ	CERS	Mon, Dec 11, 2023	1.72	1.73	1.65	1.68
6756	NASDAQ	CERS	Fri, Dec 8, 2023	1.64	1.71	1.59	1.71
6755	NASDAQ	CERS	Thu, Dec 7, 2023	1.61	1.68	1.58	1.65
6754	NASDAQ	CERS	Wed, Dec 6, 2023	1.66	1.70	1.61	1.62
6753	NASDAQ	CERS	Tue, Dec 5, 2023	1.67	1.68	1.61	1.62
6752	NASDAQ	CERS	Mon, Dec 4, 2023	1.67	1.73	1.60	1.67
6751	NASDAQ	CERS	Fri, Dec 1, 2023	1.65	1.67	1.58	1.67
6750	NASDAQ	CERS	Thu, Nov 30, 2023	1.89	1.89	1.60	1.61
6749	NASDAQ	CERS	Wed, Nov 29, 2023	1.70	1.86	1.69	1.78
6748	NASDAQ	CERS	Tue, Nov 28, 2023	1.58	1.69	1.55	1.68
6747	NASDAQ	CERS	Mon, Nov 27, 2023	1.66	1.66	1.57	1.61
6746	NASDAQ	CERS	Fri, Nov 24, 2023	1.62	1.69	1.61	1.65
6745	NASDAQ	CERS	Wed, Nov 22, 2023	1.70	1.75	1.63	1.65
6744	NASDAQ	CERS	Tue, Nov 21, 2023	1.77	1.78	1.68	1.69
6743	NASDAQ	CERS	Mon, Nov 20, 2023	1.73	1.83	1.73	1.79
6742	NASDAQ	CERS	Fri, Nov 17, 2023	1.74	1.76	1.70	1.75
6741	NASDAQ	CERS	Thu, Nov 16, 2023	1.72	1.76	1.67	1.73
6740	NASDAQ	CERS	Wed, Nov 15, 2023	1.74	1.84	1.71	1.73
6739	NASDAQ	CERS	Tue, Nov 14, 2023	1.68	1.78	1.68	1.76
6738	NASDAQ	CERS	Mon, Nov 13, 2023	1.59	1.62	1.52	1.58
6737	NASDAQ	CERS	Fri, Nov 10, 2023	1.53	1.61	1.50	1.60
6736	NASDAQ	CERS	Thu, Nov 9, 2023	1.68	1.70	1.54	1.54
6735	NASDAQ	CERS	Wed, Nov 8, 2023	1.72	1.74	1.62	1.67
6734	NASDAQ	CERS	Tue, Nov 7, 2023	1.69	1.80	1.68	1.73
6733	NASDAQ	CERS	Mon, Nov 6, 2023	1.74	1.76	1.61	1.70
6732	NASDAQ	CERS	Fri, Nov 3, 2023	1.63	1.85	1.61	1.73
6731	NASDAQ	CERS	Thu, Nov 2, 2023	1.39	1.60	1.39	1.59
6730	NASDAQ	CERS	Wed, Nov 1, 2023	1.42	1.42	1.33	1.38
6729	NASDAQ	CERS	Tue, Oct 31, 2023	1.33	1.41	1.32	1.40
6728	NASDAQ	CERS	Mon, Oct 30, 2023	1.31	1.34	1.25	1.31
6727	NASDAQ	CERS	Fri, Oct 27, 2023	1.29	1.32	1.26	1.27
6726	NASDAQ	CERS	Thu, Oct 26, 2023	1.28	1.33	1.26	1.30
6725	NASDAQ	CERS	Wed, Oct 25, 2023	1.34	1.34	1.26	1.27
6724	NASDAQ	CERS	Tue, Oct 24, 2023	1.30	1.39	1.29	1.35
6723	NASDAQ	CERS	Mon, Oct 23, 2023	1.24	1.32	1.23	1.28
6722	NASDAQ	CERS	Fri, Oct 20, 2023	1.26	1.31	1.22	1.27
6721	NASDAQ	CERS	Thu, Oct 19, 2023	1.31	1.31	1.21	1.25
6720	NASDAQ	CERS	Wed, Oct 18, 2023	1.30	1.35	1.27	1.29
6719	NASDAQ	CERS	Tue, Oct 17, 2023	1.35	1.40	1.30	1.32
6718	NASDAQ	CERS	Mon, Oct 16, 2023	1.28	1.39	1.27	1.36
6717	NASDAQ	CERS	Fri, Oct 13, 2023	1.26	1.30	1.24	1.29
6716	NASDAQ	CERS	Thu, Oct 12, 2023	1.33	1.33	1.22	1.26
6715	NASDAQ	CERS	Wed, Oct 11, 2023	1.42	1.45	1.28	1.30
6714	NASDAQ	CERS	Tue, Oct 10, 2023	1.32	1.43	1.32	1.42
6713	NASDAQ	CERS	Mon, Oct 9, 2023	1.31	1.33	1.21	1.31
6712	NASDAQ	CERS	Fri, Oct 6, 2023	1.39	1.41	1.33	1.34
6711	NASDAQ	CERS	Thu, Oct 5, 2023	1.54	1.54	1.40	1.41
6710	NASDAQ	CERS	Wed, Oct 4, 2023	1.49	1.53	1.46	1.53
6709	NASDAQ	CERS	Tue, Oct 3, 2023	1.54	1.57	1.47	1.49
6708	NASDAQ	CERS	Mon, Oct 2, 2023	1.59	1.62	1.54	1.57
6707	NASDAQ	CERS	Fri, Sep 29, 2023	1.59	1.65	1.55	1.62
6706	NASDAQ	CERS	Thu, Sep 28, 2023	1.51	1.58	1.46	1.57
6705	NASDAQ	CERS	Wed, Sep 27, 2023	1.52	1.61	1.50	1.53
6704	NASDAQ	CERS	Tue, Sep 26, 2023	1.50	1.58	1.48	1.54
6703	NASDAQ	CERS	Mon, Sep 25, 2023	1.50	1.53	1.45	1.52
6702	NASDAQ	CERS	Fri, Sep 22, 2023	1.52	1.58	1.47	1.50
6701	NASDAQ	CERS	Thu, Sep 21, 2023	1.50	1.54	1.47	1.51
6700	NASDAQ	CERS	Wed, Sep 20, 2023	1.56	1.64	1.54	1.55
6699	NASDAQ	CERS	Tue, Sep 19, 2023	1.63	1.63	1.53	1.56
6698	NASDAQ	CERS	Mon, Sep 18, 2023	1.66	1.66	1.57	1.60
6697	NASDAQ	CERS	Fri, Sep 15, 2023	1.70	1.71	1.63	1.63
6696	NASDAQ	CERS	Thu, Sep 14, 2023	1.68	1.74	1.67	1.70
6695	NASDAQ	CERS	Wed, Sep 13, 2023	1.71	1.75	1.67	1.67
6694	NASDAQ	CERS	Tue, Sep 12, 2023	1.69	1.79	1.67	1.74
6693	NASDAQ	CERS	Mon, Sep 11, 2023	1.68	1.68	1.68	1.68
6692	NASDAQ	CERS	Fri, Sep 8, 2023	1.63	1.65	1.56	1.64
6691	NASDAQ	CERS	Thu, Sep 7, 2023	1.71	1.72	1.62	1.64
6690	NASDAQ	CERS	Wed, Sep 6, 2023	1.76	1.80	1.69	1.72
6689	NASDAQ	CERS	Tue, Sep 5, 2023	1.87	1.90	1.74	1.75
6688	NASDAQ	CERS	Fri, Sep 1, 2023	1.92	1.96	1.87	1.92
6687	NASDAQ	CERS	Thu, Aug 31, 2023	1.91	1.97	1.85	1.89
6686	NASDAQ	CERS	Wed, Aug 30, 2023	1.93	1.98	1.90	1.92
6685	NASDAQ	CERS	Tue, Aug 29, 2023	1.82	1.96	1.79	1.92
6684	NASDAQ	CERS	Mon, Aug 28, 2023	1.77	1.85	1.77	1.83
6683	NASDAQ	CERS	Fri, Aug 25, 2023	1.69	1.79	1.69	1.79
6682	NASDAQ	CERS	Thu, Aug 24, 2023	1.77	1.78	1.66	1.69
6681	NASDAQ	CERS	Wed, Aug 23, 2023	1.74	1.79	1.71	1.75
6680	NASDAQ	CERS	Tue, Aug 22, 2023	1.77	1.79	1.67	1.71
6679	NASDAQ	CERS	Mon, Aug 21, 2023	1.77	1.77	1.67	1.70
6678	NASDAQ	CERS	Fri, Aug 18, 2023	1.72	1.83	1.70	1.71
6677	NASDAQ	CERS	Thu, Aug 17, 2023	1.82	1.82	1.73	1.74
6676	NASDAQ	CERS	Wed, Aug 16, 2023	1.86	1.91	1.79	1.80
6675	NASDAQ	CERS	Tue, Aug 15, 2023	1.91	1.94	1.84	1.85
6674	NASDAQ	CERS	Mon, Aug 14, 2023	1.93	1.96	1.87	1.93
6673	NASDAQ	CERS	Fri, Aug 11, 2023	1.90	1.96	1.89	1.95
6672	NASDAQ	CERS	Thu, Aug 10, 2023	2.00	2.03	1.90	1.91
6671	NASDAQ	CERS	Wed, Aug 9, 2023	2.08	2.08	1.94	1.95
6670	NASDAQ	CERS	Tue, Aug 8, 2023	2.17	2.19	2.04	2.05
6669	NASDAQ	CERS	Mon, Aug 7, 2023	2.40	2.45	2.18	2.20
6668	NASDAQ	CERS	Fri, Aug 4, 2023	2.46	2.48	2.24	2.43
6667	NASDAQ	CERS	Thu, Aug 3, 2023	2.73	2.85	2.40	2.44
6666	NASDAQ	CERS	Wed, Aug 2, 2023	2.91	3.01	2.86	2.98
6665	NASDAQ	CERS	Tue, Aug 1, 2023	3.06	3.06	2.90	2.97
6664	NASDAQ	CERS	Mon, Jul 31, 2023	2.98	3.08	2.95	3.07
6663	NASDAQ	CERS	Fri, Jul 28, 2023	2.83	2.96	2.83	2.95
6662	NASDAQ	CERS	Thu, Jul 27, 2023	2.98	2.99	2.79	2.81
6661	NASDAQ	CERS	Wed, Jul 26, 2023	2.84	2.95	2.84	2.91
6660	NASDAQ	CERS	Tue, Jul 25, 2023	2.83	2.87	2.81	2.86
6659	NASDAQ	CERS	Mon, Jul 24, 2023	2.88	2.93	2.77	2.86
6658	NASDAQ	CERS	Fri, Jul 21, 2023	2.84	2.95	2.77	2.88
6657	NASDAQ	CERS	Thu, Jul 20, 2023	2.88	2.90	2.73	2.80
6656	NASDAQ	CERS	Wed, Jul 19, 2023	2.79	2.95	2.78	2.92
6655	NASDAQ	CERS	Tue, Jul 18, 2023	2.54	2.82	2.54	2.77
6654	NASDAQ	CERS	Mon, Jul 17, 2023	2.48	2.54	2.39	2.54
6653	NASDAQ	CERS	Fri, Jul 14, 2023	2.60	2.60	2.40	2.42
6652	NASDAQ	CERS	Thu, Jul 13, 2023	2.55	2.58	2.48	2.53
6651	NASDAQ	CERS	Wed, Jul 12, 2023	2.47	2.59	2.47	2.49
6650	NASDAQ	CERS	Tue, Jul 11, 2023	2.22	2.44	2.18	2.43
6649	NASDAQ	CERS	Mon, Jul 10, 2023	2.05	2.20	2.05	2.18
6648	NASDAQ	CERS	Fri, Jul 7, 2023	2.08	2.11	2.03	2.07
6647	NASDAQ	CERS	Thu, Jul 6, 2023	2.23	2.25	2.04	2.06
6646	NASDAQ	CERS	Wed, Jul 5, 2023	2.44	2.47	2.26	2.26
6645	NASDAQ	CERS	Mon, Jul 3, 2023	2.46	2.46	2.41	2.45
6644	NASDAQ	CERS	Fri, Jun 30, 2023	2.46	2.50	2.44	2.46
6643	NASDAQ	CERS	Thu, Jun 29, 2023	2.45	2.45	2.41	2.44
6642	NASDAQ	CERS	Wed, Jun 28, 2023	2.38	2.45	2.38	2.45
6641	NASDAQ	CERS	Tue, Jun 27, 2023	2.35	2.42	2.33	2.40
6640	NASDAQ	CERS	Mon, Jun 26, 2023	2.36	2.38	2.31	2.36
6639	NASDAQ	CERS	Fri, Jun 23, 2023	2.47	2.48	2.37	2.40
6638	NASDAQ	CERS	Thu, Jun 22, 2023	2.50	2.58	2.47	2.53
6637	NASDAQ	CERS	Wed, Jun 21, 2023	2.44	2.58	2.43	2.56
6636	NASDAQ	CERS	Tue, Jun 20, 2023	2.56	2.56	2.41	2.46
6635	NASDAQ	CERS	Fri, Jun 16, 2023	2.70	2.70	2.54	2.57
6634	NASDAQ	CERS	Thu, Jun 15, 2023	2.60	2.68	2.57	2.67
6633	NASDAQ	CERS	Wed, Jun 14, 2023	2.64	2.67	2.55	2.61
6632	NASDAQ	CERS	Tue, Jun 13, 2023	2.54	2.67	2.52	2.61
6631	NASDAQ	CERS	Mon, Jun 12, 2023	2.55	2.65	2.47	2.54
6630	NASDAQ	CERS	Fri, Jun 9, 2023	2.54	2.62	2.50	2.52
6629	NASDAQ	CERS	Thu, Jun 8, 2023	2.56	2.57	2.48	2.53
6628	NASDAQ	CERS	Wed, Jun 7, 2023	2.49	2.58	2.44	2.54
6627	NASDAQ	CERS	Tue, Jun 6, 2023	2.27	2.44	2.22	2.43
6626	NASDAQ	CERS	Mon, Jun 5, 2023	2.26	2.28	2.19	2.26
6625	NASDAQ	CERS	Fri, Jun 2, 2023	2.19	2.27	2.16	2.26
6624	NASDAQ	CERS	Thu, Jun 1, 2023	2.16	2.18	2.07	2.14
6623	NASDAQ	CERS	Wed, May 31, 2023	2.05	2.17	2.02	2.14
6622	NASDAQ	CERS	Tue, May 30, 2023	1.96	2.06	1.95	2.04
6621	NASDAQ	CERS	Fri, May 26, 2023	1.93	1.99	1.86	1.93
6620	NASDAQ	CERS	Thu, May 25, 2023	2.06	2.09	1.94	1.96
6619	NASDAQ	CERS	Wed, May 24, 2023	1.94	2.04	1.91	2.03
6618	NASDAQ	CERS	Tue, May 23, 2023	1.96	2.14	1.91	1.94
6617	NASDAQ	CERS	Mon, May 22, 2023	1.86	2.00	1.82	1.98
6616	NASDAQ	CERS	Fri, May 19, 2023	1.81	1.89	1.79	1.88
6615	NASDAQ	CERS	Thu, May 18, 2023	2.00	2.00	1.76	1.79
6614	NASDAQ	CERS	Wed, May 17, 2023	1.90	1.99	1.87	1.99
6613	NASDAQ	CERS	Tue, May 16, 2023	1.89	1.93	1.85	1.88
6612	NASDAQ	CERS	Mon, May 15, 2023	1.90	1.92	1.84	1.86
6611	NASDAQ	CERS	Fri, May 12, 2023	1.93	1.99	1.81	1.88
6610	NASDAQ	CERS	Thu, May 11, 2023	2.27	2.27	1.93	1.95
6609	NASDAQ	CERS	Wed, May 10, 2023	2.23	2.26	2.10	2.17
6608	NASDAQ	CERS	Tue, May 9, 2023	2.17	2.21	2.13	2.16
6607	NASDAQ	CERS	Mon, May 8, 2023	2.30	2.39	2.19	2.21
6606	NASDAQ	CERS	Fri, May 5, 2023	2.22	2.29	2.14	2.28
6605	NASDAQ	CERS	Thu, May 4, 2023	2.25	2.33	2.25	2.31
6604	NASDAQ	CERS	Wed, May 3, 2023	2.19	2.37	2.19	2.30
6603	NASDAQ	CERS	Tue, May 2, 2023	2.37	2.37	2.15	2.16
6602	NASDAQ	CERS	Mon, May 1, 2023	2.31	2.39	2.29	2.35
6601	NASDAQ	CERS	Fri, Apr 28, 2023	2.29	2.36	2.25	2.31
6600	NASDAQ	CERS	Thu, Apr 27, 2023	2.35	2.37	2.29	2.29
6599	NASDAQ	CERS	Wed, Apr 26, 2023	2.42	2.45	2.32	2.35
6598	NASDAQ	CERS	Tue, Apr 25, 2023	2.42	2.49	2.42	2.43
6597	NASDAQ	CERS	Mon, Apr 24, 2023	2.49	2.52	2.42	2.46
6596	NASDAQ	CERS	Fri, Apr 21, 2023	2.41	2.53	2.39	2.50
6595	NASDAQ	CERS	Thu, Apr 20, 2023	2.55	2.56	2.41	2.42
6594	NASDAQ	CERS	Wed, Apr 19, 2023	2.72	2.73	2.56	2.57
6593	NASDAQ	CERS	Tue, Apr 18, 2023	2.82	2.84	2.72	2.72
6592	NASDAQ	CERS	Mon, Apr 17, 2023	2.84	2.86	2.78	2.81
6591	NASDAQ	CERS	Fri, Apr 14, 2023	2.87	2.92	2.76	2.81
6590	NASDAQ	CERS	Thu, Apr 13, 2023	2.80	2.92	2.78	2.90
6589	NASDAQ	CERS	Wed, Apr 12, 2023	2.92	2.92	2.79	2.79
6588	NASDAQ	CERS	Tue, Apr 11, 2023	2.86	2.91	2.82	2.85
6587	NASDAQ	CERS	Mon, Apr 10, 2023	2.84	2.85	2.78	2.83
6586	NASDAQ	CERS	Thu, Apr 6, 2023	2.76	2.89	2.74	2.87
6585	NASDAQ	CERS	Wed, Apr 5, 2023	2.83	2.86	2.77	2.80
6584	NASDAQ	CERS	Tue, Apr 4, 2023	2.85	2.87	2.79	2.82
6583	NASDAQ	CERS	Mon, Apr 3, 2023	2.95	2.96	2.81	2.86
6582	NASDAQ	CERS	Fri, Mar 31, 2023	2.82	3.00	2.82	2.97
6581	NASDAQ	CERS	Thu, Mar 30, 2023	2.78	2.86	2.78	2.81
6580	NASDAQ	CERS	Wed, Mar 29, 2023	2.80	2.85	2.74	2.77
6579	NASDAQ	CERS	Tue, Mar 28, 2023	2.85	2.90	2.78	2.79
6578	NASDAQ	CERS	Mon, Mar 27, 2023	2.94	2.97	2.83	2.84
6577	NASDAQ	CERS	Fri, Mar 24, 2023	2.83	2.93	2.77	2.90
6576	NASDAQ	CERS	Thu, Mar 23, 2023	2.83	2.96	2.79	2.82
6575	NASDAQ	CERS	Wed, Mar 22, 2023	3.01	3.02	2.80	2.80
6574	NASDAQ	CERS	Tue, Mar 21, 2023	2.92	3.06	2.87	3.01
6573	NASDAQ	CERS	Mon, Mar 20, 2023	2.95	2.95	2.84	2.90
6572	NASDAQ	CERS	Fri, Mar 17, 2023	2.93	2.95	2.84	2.93
6571	NASDAQ	CERS	Thu, Mar 16, 2023	2.88	2.99	2.82	2.95
6570	NASDAQ	CERS	Wed, Mar 15, 2023	2.81	2.99	2.81	2.90
6569	NASDAQ	CERS	Tue, Mar 14, 2023	2.99	3.03	2.80	2.89
6568	NASDAQ	CERS	Mon, Mar 13, 2023	2.78	3.04	2.73	2.92
6567	NASDAQ	CERS	Fri, Mar 10, 2023	2.78	2.89	2.67	2.80
6566	NASDAQ	CERS	Thu, Mar 9, 2023	2.79	2.88	2.76	2.78
6565	NASDAQ	CERS	Wed, Mar 8, 2023	2.80	2.84	2.74	2.80
6564	NASDAQ	CERS	Tue, Mar 7, 2023	2.80	2.84	2.75	2.79
6563	NASDAQ	CERS	Mon, Mar 6, 2023	2.91	2.92	2.78	2.81
6562	NASDAQ	CERS	Fri, Mar 3, 2023	2.82	3.00	2.72	2.91
6561	NASDAQ	CERS	Thu, Mar 2, 2023	2.69	2.81	2.56	2.80
6560	NASDAQ	CERS	Wed, Mar 1, 2023	2.71	2.79	2.36	2.65
6559	NASDAQ	CERS	Tue, Feb 28, 2023	2.87	2.94	2.74	2.86
6558	NASDAQ	CERS	Mon, Feb 27, 2023	2.76	2.86	2.76	2.85
6557	NASDAQ	CERS	Fri, Feb 24, 2023	2.79	2.87	2.75	2.78
6556	NASDAQ	CERS	Thu, Feb 23, 2023	2.93	2.94	2.78	2.87
6555	NASDAQ	CERS	Wed, Feb 22, 2023	2.76	2.94	2.76	2.85
6554	NASDAQ	CERS	Tue, Feb 21, 2023	2.91	2.96	2.76	2.76
6553	NASDAQ	CERS	Fri, Feb 17, 2023	3.01	3.03	2.85	3.00
6552	NASDAQ	CERS	Thu, Feb 16, 2023	2.88	3.11	2.81	3.01
6551	NASDAQ	CERS	Wed, Feb 15, 2023	2.91	3.03	2.84	3.02
6550	NASDAQ	CERS	Tue, Feb 14, 2023	2.96	3.03	2.87	2.92
6549	NASDAQ	CERS	Mon, Feb 13, 2023	2.97	3.06	2.93	3.01
6548	NASDAQ	CERS	Fri, Feb 10, 2023	2.97	2.97	2.88	2.94
6547	NASDAQ	CERS	Thu, Feb 9, 2023	3.12	3.16	2.95	3.00
6546	NASDAQ	CERS	Wed, Feb 8, 2023	3.20	3.24	3.07	3.07
6545	NASDAQ	CERS	Tue, Feb 7, 2023	3.17	3.23	3.10	3.21
6544	NASDAQ	CERS	Mon, Feb 6, 2023	3.24	3.28	3.17	3.20
6543	NASDAQ	CERS	Fri, Feb 3, 2023	3.28	3.34	3.21	3.25
6542	NASDAQ	CERS	Thu, Feb 2, 2023	3.31	3.46	3.30	3.34
6541	NASDAQ	CERS	Wed, Feb 1, 2023	3.16	3.27	3.09	3.23
6540	NASDAQ	CERS	Tue, Jan 31, 2023	3.02	3.16	3.02	3.14
6539	NASDAQ	CERS	Mon, Jan 30, 2023	3.14	3.14	3.00	3.01
6538	NASDAQ	CERS	Fri, Jan 27, 2023	3.06	3.15	3.06	3.12
6537	NASDAQ	CERS	Thu, Jan 26, 2023	3.19	3.21	3.05	3.10
6536	NASDAQ	CERS	Wed, Jan 25, 2023	3.08	3.11	3.00	3.10
6535	NASDAQ	CERS	Tue, Jan 24, 2023	3.10	3.15	3.08	3.12
6534	NASDAQ	CERS	Mon, Jan 23, 2023	3.13	3.18	3.07	3.12
6533	NASDAQ	CERS	Fri, Jan 20, 2023	3.14	3.21	3.07	3.12
6532	NASDAQ	CERS	Thu, Jan 19, 2023	3.11	3.16	3.08	3.10
6531	NASDAQ	CERS	Wed, Jan 18, 2023	3.18	3.25	3.09	3.13
6530	NASDAQ	CERS	Tue, Jan 17, 2023	3.04	3.19	3.04	3.14
6529	NASDAQ	CERS	Fri, Jan 13, 2023	3.02	3.15	2.97	3.14
6528	NASDAQ	CERS	Thu, Jan 12, 2023	2.95	3.11	2.78	3.04
6527	NASDAQ	CERS	Wed, Jan 11, 2023	2.81	2.96	2.76	2.93
6526	NASDAQ	CERS	Tue, Jan 10, 2023	2.70	2.89	2.69	2.83
6525	NASDAQ	CERS	Mon, Jan 9, 2023	3.52	3.59	2.53	2.72
6524	NASDAQ	CERS	Fri, Jan 6, 2023	3.74	3.82	3.67	3.78
6523	NASDAQ	CERS	Thu, Jan 5, 2023	3.92	4.05	3.73	3.77
6522	NASDAQ	CERS	Wed, Jan 4, 2023	3.80	3.85	3.74	3.81
6521	NASDAQ	CERS	Tue, Jan 3, 2023	3.68	3.79	3.67	3.74
6520	NASDAQ	CERS	Fri, Dec 30, 2022	3.53	3.67	3.44	3.65
6519	NASDAQ	CERS	Thu, Dec 29, 2022	3.47	3.68	3.46	3.57
6518	NASDAQ	CERS	Wed, Dec 28, 2022	3.48	3.57	3.43	3.43
6517	NASDAQ	CERS	Tue, Dec 27, 2022	3.75	3.79	3.51	3.52
6516	NASDAQ	CERS	Fri, Dec 23, 2022	3.80	4.12	3.69	3.71
6515	NASDAQ	CERS	Thu, Dec 22, 2022	4.07	4.10	3.98	4.10
6514	NASDAQ	CERS	Wed, Dec 21, 2022	3.97	4.14	3.85	4.13
6513	NASDAQ	CERS	Tue, Dec 20, 2022	3.82	3.88	3.79	3.83
6512	NASDAQ	CERS	Mon, Dec 19, 2022	4.01	4.01	3.88	3.88
6511	NASDAQ	CERS	Fri, Dec 16, 2022	4.02	4.08	3.87	4.02
6510	NASDAQ	CERS	Thu, Dec 15, 2022	4.16	4.19	4.05	4.11
6509	NASDAQ	CERS	Wed, Dec 14, 2022	4.04	4.25	3.99	4.22
6508	NASDAQ	CERS	Tue, Dec 13, 2022	4.02	4.18	3.96	4.06
6507	NASDAQ	CERS	Mon, Dec 12, 2022	3.92	3.95	3.79	3.80
6506	NASDAQ	CERS	Fri, Dec 9, 2022	3.95	4.01	3.89	3.94
6505	NASDAQ	CERS	Thu, Dec 8, 2022	3.95	3.97	3.86	3.96
6504	NASDAQ	CERS	Wed, Dec 7, 2022	3.91	3.97	3.85	3.92
6503	NASDAQ	CERS	Tue, Dec 6, 2022	4.02	4.02	3.89	3.93
6502	NASDAQ	CERS	Mon, Dec 5, 2022	4.04	4.19	3.95	3.99
6501	NASDAQ	CERS	Fri, Dec 2, 2022	3.97	4.16	3.89	4.15
6500	NASDAQ	CERS	Thu, Dec 1, 2022	3.99	4.13	3.95	4.13
6499	NASDAQ	CERS	Wed, Nov 30, 2022	3.69	4.00	3.64	4.00
6498	NASDAQ	CERS	Tue, Nov 29, 2022	3.74	3.74	3.62	3.65
6497	NASDAQ	CERS	Mon, Nov 28, 2022	3.74	3.88	3.67	3.70
6496	NASDAQ	CERS	Fri, Nov 25, 2022	3.91	3.92	3.83	3.86
6495	NASDAQ	CERS	Wed, Nov 23, 2022	3.83	3.97	3.81	3.91
6494	NASDAQ	CERS	Tue, Nov 22, 2022	3.87	3.87	3.74	3.82
6493	NASDAQ	CERS	Mon, Nov 21, 2022	3.87	4.01	3.82	3.84
6492	NASDAQ	CERS	Fri, Nov 18, 2022	3.96	3.96	3.88	3.92
6491	NASDAQ	CERS	Thu, Nov 17, 2022	4.03	4.03	3.80	3.84
6490	NASDAQ	CERS	Wed, Nov 16, 2022	4.01	4.11	3.92	3.95
6489	NASDAQ	CERS	Tue, Nov 15, 2022	4.09	4.14	3.98	4.04
6488	NASDAQ	CERS	Mon, Nov 14, 2022	4.05	4.12	3.88	3.88
6487	NASDAQ	CERS	Fri, Nov 11, 2022	4.04	4.16	3.95	4.10
6486	NASDAQ	CERS	Thu, Nov 10, 2022	3.91	4.01	3.81	3.99
6485	NASDAQ	CERS	Wed, Nov 9, 2022	3.76	3.76	3.50	3.58
6484	NASDAQ	CERS	Tue, Nov 8, 2022	3.79	3.84	3.65	3.70
6483	NASDAQ	CERS	Mon, Nov 7, 2022	3.75	3.83	3.70	3.75
6482	NASDAQ	CERS	Fri, Nov 4, 2022	3.55	3.77	3.49	3.76
6481	NASDAQ	CERS	Thu, Nov 3, 2022	3.47	3.49	3.25	3.38
6480	NASDAQ	CERS	Wed, Nov 2, 2022	3.67	3.71	3.49	3.49
6479	NASDAQ	CERS	Tue, Nov 1, 2022	3.77	3.77	3.64	3.69
6478	NASDAQ	CERS	Mon, Oct 31, 2022	3.65	3.70	3.61	3.66
6477	NASDAQ	CERS	Fri, Oct 28, 2022	3.60	3.71	3.57	3.68
6476	NASDAQ	CERS	Thu, Oct 27, 2022	3.78	3.79	3.60	3.61
6475	NASDAQ	CERS	Wed, Oct 26, 2022	3.61	3.81	3.59	3.74
6474	NASDAQ	CERS	Tue, Oct 25, 2022	3.47	3.67	3.47	3.60
6473	NASDAQ	CERS	Mon, Oct 24, 2022	3.53	3.59	3.44	3.46
6472	NASDAQ	CERS	Fri, Oct 21, 2022	3.55	3.57	3.44	3.53
6471	NASDAQ	CERS	Thu, Oct 20, 2022	3.48	3.64	3.47	3.52
6470	NASDAQ	CERS	Wed, Oct 19, 2022	3.55	3.56	3.44	3.50
6469	NASDAQ	CERS	Tue, Oct 18, 2022	3.70	3.86	3.58	3.61
6468	NASDAQ	CERS	Mon, Oct 17, 2022	3.47	3.63	3.47	3.59
6467	NASDAQ	CERS	Fri, Oct 14, 2022	3.61	3.65	3.43	3.44
6466	NASDAQ	CERS	Thu, Oct 13, 2022	3.30	3.64	3.27	3.56
6465	NASDAQ	CERS	Wed, Oct 12, 2022	3.42	3.45	3.33	3.42
6464	NASDAQ	CERS	Tue, Oct 11, 2022	3.47	3.53	3.37	3.42
6463	NASDAQ	CERS	Mon, Oct 10, 2022	3.61	3.61	3.48	3.48
6462	NASDAQ	CERS	Fri, Oct 7, 2022	3.69	3.74	3.59	3.61
6461	NASDAQ	CERS	Thu, Oct 6, 2022	3.73	3.86	3.73	3.80
6460	NASDAQ	CERS	Wed, Oct 5, 2022	3.83	3.84	3.70	3.79
6459	NASDAQ	CERS	Tue, Oct 4, 2022	3.83	3.93	3.83	3.87
6458	NASDAQ	CERS	Mon, Oct 3, 2022	3.74	3.79	3.61	3.75
6457	NASDAQ	CERS	Fri, Sep 30, 2022	3.54	3.75	3.54	3.60
6456	NASDAQ	CERS	Thu, Sep 29, 2022	3.62	3.64	3.50	3.55
6455	NASDAQ	CERS	Wed, Sep 28, 2022	3.49	3.72	3.48	3.69
6454	NASDAQ	CERS	Tue, Sep 27, 2022	3.56	3.59	3.39	3.43
6453	NASDAQ	CERS	Mon, Sep 26, 2022	3.47	3.60	3.46	3.47
6452	NASDAQ	CERS	Fri, Sep 23, 2022	3.50	3.56	3.46	3.49
6451	NASDAQ	CERS	Thu, Sep 22, 2022	3.66	3.68	3.52	3.58
6450	NASDAQ	CERS	Wed, Sep 21, 2022	3.76	3.81	3.66	3.70
6449	NASDAQ	CERS	Tue, Sep 20, 2022	3.80	3.85	3.71	3.75
6448	NASDAQ	CERS	Mon, Sep 19, 2022	3.97	3.97	3.70	3.85
6447	NASDAQ	CERS	Fri, Sep 16, 2022	3.94	3.94	3.69	3.85
6446	NASDAQ	CERS	Thu, Sep 15, 2022	4.27	4.28	3.95	4.01
6445	NASDAQ	CERS	Wed, Sep 14, 2022	4.00	4.04	3.89	3.96
6444	NASDAQ	CERS	Tue, Sep 13, 2022	4.08	4.12	3.95	3.95
6443	NASDAQ	CERS	Mon, Sep 12, 2022	4.19	4.32	4.17	4.27
6442	NASDAQ	CERS	Fri, Sep 9, 2022	4.11	4.20	4.06	4.15
6441	NASDAQ	CERS	Thu, Sep 8, 2022	3.99	4.11	3.99	4.05
6440	NASDAQ	CERS	Wed, Sep 7, 2022	3.95	4.08	3.93	4.07
6439	NASDAQ	CERS	Tue, Sep 6, 2022	3.93	3.95	3.85	3.93
6438	NASDAQ	CERS	Fri, Sep 2, 2022	4.13	4.18	3.90	3.92
6437	NASDAQ	CERS	Thu, Sep 1, 2022	4.23	4.23	4.00	4.09
6436	NASDAQ	CERS	Wed, Aug 31, 2022	4.25	4.27	4.07	4.11
6435	NASDAQ	CERS	Tue, Aug 30, 2022	4.22	4.25	4.10	4.15
6434	NASDAQ	CERS	Mon, Aug 29, 2022	4.24	4.35	4.17	4.19
6433	NASDAQ	CERS	Fri, Aug 26, 2022	4.60	4.63	4.29	4.30
6432	NASDAQ	CERS	Thu, Aug 25, 2022	4.61	4.67	4.55	4.63
6431	NASDAQ	CERS	Wed, Aug 24, 2022	4.60	4.64	4.53	4.56
6430	NASDAQ	CERS	Tue, Aug 23, 2022	4.62	4.63	4.52	4.55
6429	NASDAQ	CERS	Mon, Aug 22, 2022	4.65	4.73	4.58	4.60
6428	NASDAQ	CERS	Fri, Aug 19, 2022	4.75	4.77	4.68	4.70
6427	NASDAQ	CERS	Thu, Aug 18, 2022	4.87	4.90	4.75	4.82
6426	NASDAQ	CERS	Wed, Aug 17, 2022	4.94	5.02	4.88	4.88
6425	NASDAQ	CERS	Tue, Aug 16, 2022	5.09	5.16	4.95	5.04
6424	NASDAQ	CERS	Mon, Aug 15, 2022	5.18	5.27	5.12	5.13
6423	NASDAQ	CERS	Fri, Aug 12, 2022	5.26	5.29	5.14	5.23
6422	NASDAQ	CERS	Thu, Aug 11, 2022	5.55	5.66	5.23	5.25
6421	NASDAQ	CERS	Wed, Aug 10, 2022	5.29	5.43	5.14	5.43
6420	NASDAQ	CERS	Tue, Aug 9, 2022	5.14	5.17	5.01	5.09
6419	NASDAQ	CERS	Mon, Aug 8, 2022	5.64	5.64	5.13	5.23
6418	NASDAQ	CERS	Fri, Aug 5, 2022	5.62	5.85	5.25	5.57
6417	NASDAQ	CERS	Thu, Aug 4, 2022	5.84	5.93	5.65	5.82
6416	NASDAQ	CERS	Wed, Aug 3, 2022	5.70	5.87	5.63	5.83
6415	NASDAQ	CERS	Tue, Aug 2, 2022	5.49	5.70	5.48	5.62
6414	NASDAQ	CERS	Mon, Aug 1, 2022	5.37	5.59	5.25	5.52
6413	NASDAQ	CERS	Fri, Jul 29, 2022	5.51	5.55	5.33	5.40
6412	NASDAQ	CERS	Thu, Jul 28, 2022	5.57	5.63	5.34	5.55
6411	NASDAQ	CERS	Wed, Jul 27, 2022	5.41	5.59	5.33	5.55
6410	NASDAQ	CERS	Tue, Jul 26, 2022	5.34	5.40	5.27	5.35
6409	NASDAQ	CERS	Mon, Jul 25, 2022	5.30	5.35	5.13	5.35
6408	NASDAQ	CERS	Fri, Jul 22, 2022	5.81	5.81	5.29	5.35
6407	NASDAQ	CERS	Thu, Jul 21, 2022	5.77	5.84	5.71	5.78
6406	NASDAQ	CERS	Wed, Jul 20, 2022	5.65	5.85	5.64	5.75
6405	NASDAQ	CERS	Tue, Jul 19, 2022	5.57	5.70	5.51	5.61
6404	NASDAQ	CERS	Mon, Jul 18, 2022	5.72	5.81	5.46	5.47
6403	NASDAQ	CERS	Fri, Jul 15, 2022	5.64	5.75	5.47	5.68
6402	NASDAQ	CERS	Thu, Jul 14, 2022	5.59	5.59	5.36	5.49
6401	NASDAQ	CERS	Wed, Jul 13, 2022	5.52	5.75	5.51	5.63
6400	NASDAQ	CERS	Tue, Jul 12, 2022	5.65	5.75	5.42	5.62
6399	NASDAQ	CERS	Mon, Jul 11, 2022	5.75	5.79	5.57	5.59
6398	NASDAQ	CERS	Fri, Jul 8, 2022	5.69	5.95	5.67	5.79
6397	NASDAQ	CERS	Thu, Jul 7, 2022	5.35	5.89	5.27	5.83
6396	NASDAQ	CERS	Wed, Jul 6, 2022	5.77	5.91	5.60	5.60
6395	NASDAQ	CERS	Tue, Jul 5, 2022	5.42	5.76	5.41	5.74
6394	NASDAQ	CERS	Fri, Jul 1, 2022	5.31	5.49	5.21	5.48
6393	NASDAQ	CERS	Thu, Jun 30, 2022	5.25	5.36	5.18	5.29
6392	NASDAQ	CERS	Wed, Jun 29, 2022	5.33	5.37	5.17	5.34
6391	NASDAQ	CERS	Tue, Jun 28, 2022	5.37	5.53	5.27	5.32
6390	NASDAQ	CERS	Mon, Jun 27, 2022	5.53	5.61	5.35	5.48
6389	NASDAQ	CERS	Fri, Jun 24, 2022	5.48	5.58	5.37	5.55
6388	NASDAQ	CERS	Thu, Jun 23, 2022	5.22	5.49	5.17	5.46
6387	NASDAQ	CERS	Wed, Jun 22, 2022	4.81	5.23	4.67	5.17
6386	NASDAQ	CERS	Tue, Jun 21, 2022	4.81	4.87	4.70	4.74
6385	NASDAQ	CERS	Fri, Jun 17, 2022	4.44	4.77	4.44	4.65
6384	NASDAQ	CERS	Thu, Jun 16, 2022	4.51	4.54	4.35	4.43
6383	NASDAQ	CERS	Wed, Jun 15, 2022	4.59	4.81	4.55	4.72
6382	NASDAQ	CERS	Tue, Jun 14, 2022	4.65	4.92	4.42	4.50
6381	NASDAQ	CERS	Mon, Jun 13, 2022	4.54	4.75	4.53	4.60
6380	NASDAQ	CERS	Fri, Jun 10, 2022	4.90	5.04	4.71	4.76
6379	NASDAQ	CERS	Thu, Jun 9, 2022	5.26	5.32	5.10	5.11
6378	NASDAQ	CERS	Wed, Jun 8, 2022	5.22	5.36	5.18	5.30
6377	NASDAQ	CERS	Tue, Jun 7, 2022	4.95	5.26	4.92	5.26
6376	NASDAQ	CERS	Mon, Jun 6, 2022	5.12	5.15	4.91	5.02
6375	NASDAQ	CERS	Fri, Jun 3, 2022	5.05	5.17	4.96	5.01
6374	NASDAQ	CERS	Thu, Jun 2, 2022	4.82	5.22	4.82	5.20
6373	NASDAQ	CERS	Wed, Jun 1, 2022	4.94	5.02	4.75	4.84
6372	NASDAQ	CERS	Tue, May 31, 2022	5.36	5.40	4.92	4.95
6371	NASDAQ	CERS	Fri, May 27, 2022	5.04	5.54	5.00	5.43
6370	NASDAQ	CERS	Thu, May 26, 2022	4.85	5.05	4.85	4.97
6369	NASDAQ	CERS	Wed, May 25, 2022	4.82	4.98	4.72	4.84
6368	NASDAQ	CERS	Tue, May 24, 2022	4.96	5.04	4.79	4.83
6367	NASDAQ	CERS	Mon, May 23, 2022	5.12	5.18	4.96	5.05
6366	NASDAQ	CERS	Fri, May 20, 2022	5.08	5.20	4.86	5.13
6365	NASDAQ	CERS	Thu, May 19, 2022	4.73	5.12	4.73	5.01
6364	NASDAQ	CERS	Wed, May 18, 2022	5.01	5.06	4.76	4.78
6363	NASDAQ	CERS	Tue, May 17, 2022	5.01	5.21	5.01	5.12
6362	NASDAQ	CERS	Mon, May 16, 2022	5.28	5.36	5.01	5.05
6361	NASDAQ	CERS	Fri, May 13, 2022	4.97	5.39	4.97	5.28
6360	NASDAQ	CERS	Thu, May 12, 2022	4.56	5.08	4.56	4.87
6359	NASDAQ	CERS	Wed, May 11, 2022	4.82	5.05	4.56	4.60
6358	NASDAQ	CERS	Tue, May 10, 2022	5.13	5.29	4.71	4.99
6357	NASDAQ	CERS	Mon, May 9, 2022	5.17	5.32	4.91	4.95
6356	NASDAQ	CERS	Fri, May 6, 2022	4.74	5.29	4.50	5.28
6355	NASDAQ	CERS	Thu, May 5, 2022	5.02	5.07	4.71	4.80
6354	NASDAQ	CERS	Wed, May 4, 2022	5.02	5.21	4.74	5.13
6353	NASDAQ	CERS	Tue, May 3, 2022	4.81	5.00	4.78	4.90
6352	NASDAQ	CERS	Mon, May 2, 2022	4.65	4.92	4.59	4.81
6351	NASDAQ	CERS	Fri, Apr 29, 2022	4.65	4.77	4.61	4.62
6350	NASDAQ	CERS	Thu, Apr 28, 2022	4.70	4.87	4.55	4.70
6349	NASDAQ	CERS	Wed, Apr 27, 2022	4.54	4.78	4.51	4.68
6348	NASDAQ	CERS	Tue, Apr 26, 2022	4.73	4.80	4.55	4.57
6347	NASDAQ	CERS	Mon, Apr 25, 2022	4.52	4.80	4.50	4.79
6346	NASDAQ	CERS	Fri, Apr 22, 2022	4.57	4.58	4.38	4.41
6345	NASDAQ	CERS	Thu, Apr 21, 2022	4.82	4.95	4.53	4.57
6344	NASDAQ	CERS	Wed, Apr 20, 2022	4.82	4.88	4.72	4.78
6343	NASDAQ	CERS	Tue, Apr 19, 2022	4.62	4.84	4.60	4.78
6342	NASDAQ	CERS	Mon, Apr 18, 2022	4.80	4.83	4.61	4.65
6341	NASDAQ	CERS	Thu, Apr 14, 2022	5.04	5.05	4.82	4.83
6340	NASDAQ	CERS	Wed, Apr 13, 2022	4.97	5.11	4.97	5.04
6339	NASDAQ	CERS	Tue, Apr 12, 2022	5.14	5.26	4.92	4.97
6338	NASDAQ	CERS	Mon, Apr 11, 2022	5.20	5.20	5.00	5.03
6337	NASDAQ	CERS	Fri, Apr 8, 2022	5.29	5.33	5.15	5.19
6336	NASDAQ	CERS	Thu, Apr 7, 2022	5.37	5.43	5.24	5.33
6335	NASDAQ	CERS	Wed, Apr 6, 2022	5.41	5.43	5.20	5.36
6334	NASDAQ	CERS	Tue, Apr 5, 2022	5.69	5.74	5.46	5.49
6333	NASDAQ	CERS	Mon, Apr 4, 2022	5.68	5.71	5.56	5.69
6332	NASDAQ	CERS	Fri, Apr 1, 2022	5.49	5.67	5.45	5.67
6331	NASDAQ	CERS	Thu, Mar 31, 2022	5.58	5.63	5.48	5.49
6330	NASDAQ	CERS	Wed, Mar 30, 2022	5.66	5.70	5.55	5.57
6329	NASDAQ	CERS	Tue, Mar 29, 2022	5.58	5.78	5.58	5.73
6328	NASDAQ	CERS	Mon, Mar 28, 2022	5.35	5.49	5.28	5.49
6327	NASDAQ	CERS	Fri, Mar 25, 2022	5.52	5.53	5.31	5.40
6326	NASDAQ	CERS	Thu, Mar 24, 2022	5.45	5.52	5.38	5.52
6325	NASDAQ	CERS	Wed, Mar 23, 2022	5.51	5.54	5.40	5.43
6324	NASDAQ	CERS	Tue, Mar 22, 2022	5.45	5.70	5.41	5.60
6323	NASDAQ	CERS	Mon, Mar 21, 2022	5.62	5.67	5.35	5.42
6322	NASDAQ	CERS	Fri, Mar 18, 2022	5.49	5.72	5.45	5.65
6321	NASDAQ	CERS	Thu, Mar 17, 2022	5.26	5.56	5.23	5.51
6320	NASDAQ	CERS	Wed, Mar 16, 2022	4.92	5.31	4.91	5.30
6319	NASDAQ	CERS	Tue, Mar 15, 2022	4.92	5.05	4.75	4.85
6318	NASDAQ	CERS	Mon, Mar 14, 2022	5.08	5.23	4.87	4.91
6317	NASDAQ	CERS	Fri, Mar 11, 2022	5.54	5.62	5.21	5.22
6316	NASDAQ	CERS	Thu, Mar 10, 2022	5.67	5.72	5.47	5.47
6315	NASDAQ	CERS	Wed, Mar 9, 2022	5.55	5.83	5.28	5.81
6314	NASDAQ	CERS	Tue, Mar 8, 2022	5.63	5.70	5.48	5.52
6313	NASDAQ	CERS	Mon, Mar 7, 2022	5.59	5.68	5.54	5.63
6312	NASDAQ	CERS	Fri, Mar 4, 2022	5.57	5.68	5.48	5.54
6311	NASDAQ	CERS	Thu, Mar 3, 2022	5.62	5.87	5.55	5.63
6310	NASDAQ	CERS	Wed, Mar 2, 2022	5.77	5.90	5.74	5.81
6309	NASDAQ	CERS	Tue, Mar 1, 2022	5.83	6.00	5.71	5.76
6308	NASDAQ	CERS	Mon, Feb 28, 2022	5.78	5.97	5.75	5.87
6307	NASDAQ	CERS	Fri, Feb 25, 2022	5.77	5.79	5.56	5.79
6306	NASDAQ	CERS	Thu, Feb 24, 2022	5.05	5.73	5.00	5.72
6305	NASDAQ	CERS	Wed, Feb 23, 2022	4.97	5.43	4.97	5.22
6304	NASDAQ	CERS	Tue, Feb 22, 2022	5.25	5.41	5.19	5.25
6303	NASDAQ	CERS	Fri, Feb 18, 2022	5.36	5.57	5.30	5.33
6302	NASDAQ	CERS	Thu, Feb 17, 2022	5.53	5.53	5.36	5.40
6301	NASDAQ	CERS	Wed, Feb 16, 2022	5.45	5.62	5.34	5.58
6300	NASDAQ	CERS	Tue, Feb 15, 2022	5.35	5.53	5.34	5.51
6299	NASDAQ	CERS	Mon, Feb 14, 2022	5.19	5.39	5.17	5.21
6298	NASDAQ	CERS	Fri, Feb 11, 2022	5.42	5.58	5.22	5.27
6297	NASDAQ	CERS	Thu, Feb 10, 2022	5.44	5.63	5.33	5.43
6296	NASDAQ	CERS	Wed, Feb 9, 2022	5.46	5.58	5.44	5.58
6295	NASDAQ	CERS	Tue, Feb 8, 2022	5.21	5.39	5.16	5.39
6294	NASDAQ	CERS	Mon, Feb 7, 2022	5.08	5.34	5.08	5.22
6293	NASDAQ	CERS	Fri, Feb 4, 2022	4.99	5.15	4.89	5.09
6292	NASDAQ	CERS	Thu, Feb 3, 2022	4.99	5.15	4.95	5.04
6291	NASDAQ	CERS	Wed, Feb 2, 2022	5.35	5.39	5.09	5.13
6290	NASDAQ	CERS	Tue, Feb 1, 2022	5.41	5.44	5.14	5.34
6289	NASDAQ	CERS	Mon, Jan 31, 2022	5.03	5.37	5.03	5.36
6288	NASDAQ	CERS	Fri, Jan 28, 2022	4.80	5.04	4.67	5.03
6287	NASDAQ	CERS	Thu, Jan 27, 2022	5.08	5.17	4.81	4.81
6286	NASDAQ	CERS	Wed, Jan 26, 2022	5.21	5.36	4.98	5.00
6285	NASDAQ	CERS	Tue, Jan 25, 2022	5.21	5.28	4.99	5.09
6284	NASDAQ	CERS	Mon, Jan 24, 2022	5.04	5.36	4.79	5.33
6283	NASDAQ	CERS	Fri, Jan 21, 2022	5.32	5.50	5.17	5.20
6282	NASDAQ	CERS	Thu, Jan 20, 2022	5.44	5.81	5.36	5.38
6281	NASDAQ	CERS	Wed, Jan 19, 2022	5.67	5.79	5.38	5.39
6280	NASDAQ	CERS	Tue, Jan 18, 2022	5.73	5.81	5.54	5.57
6279	NASDAQ	CERS	Fri, Jan 14, 2022	5.78	5.94	5.69	5.84
6278	NASDAQ	CERS	Thu, Jan 13, 2022	6.12	6.14	5.89	5.91
6277	NASDAQ	CERS	Wed, Jan 12, 2022	6.36	6.45	6.11	6.12
6276	NASDAQ	CERS	Tue, Jan 11, 2022	6.26	6.39	6.18	6.32
6275	NASDAQ	CERS	Mon, Jan 10, 2022	5.86	6.27	5.79	6.26
6274	NASDAQ	CERS	Fri, Jan 7, 2022	6.18	6.41	5.99	6.01
6273	NASDAQ	CERS	Thu, Jan 6, 2022	6.20	6.41	6.04	6.26
6272	NASDAQ	CERS	Wed, Jan 5, 2022	6.52	6.60	6.21	6.22
6271	NASDAQ	CERS	Tue, Jan 4, 2022	6.99	7.01	6.57	6.59
6270	NASDAQ	CERS	Mon, Jan 3, 2022	6.89	7.01	6.74	6.99
6269	NASDAQ	CERS	Fri, Dec 31, 2021	6.98	7.08	6.79	6.81
6268	NASDAQ	CERS	Thu, Dec 30, 2021	6.83	7.06	6.82	6.96
6267	NASDAQ	CERS	Wed, Dec 29, 2021	6.76	6.85	6.72	6.82
6266	NASDAQ	CERS	Tue, Dec 28, 2021	6.93	7.01	6.76	6.78
6265	NASDAQ	CERS	Mon, Dec 27, 2021	6.96	6.98	6.86	6.95
6264	NASDAQ	CERS	Thu, Dec 23, 2021	6.90	7.00	6.79	6.95
6263	NASDAQ	CERS	Wed, Dec 22, 2021	6.82	6.97	6.77	6.90
6262	NASDAQ	CERS	Tue, Dec 21, 2021	6.77	6.83	6.66	6.81
6261	NASDAQ	CERS	Mon, Dec 20, 2021	6.55	6.68	6.41	6.62
6260	NASDAQ	CERS	Fri, Dec 17, 2021	6.19	6.72	6.12	6.69
6259	NASDAQ	CERS	Thu, Dec 16, 2021	6.59	6.62	6.13	6.20
6258	NASDAQ	CERS	Wed, Dec 15, 2021	6.24	6.51	6.11	6.51
6257	NASDAQ	CERS	Tue, Dec 14, 2021	6.59	6.59	6.20	6.26
6256	NASDAQ	CERS	Mon, Dec 13, 2021	6.55	6.79	6.55	6.64
6255	NASDAQ	CERS	Fri, Dec 10, 2021	6.77	6.90	6.50	6.53
6254	NASDAQ	CERS	Thu, Dec 9, 2021	7.02	7.10	6.71	6.72
6253	NASDAQ	CERS	Wed, Dec 8, 2021	7.11	7.20	6.84	7.05
6252	NASDAQ	CERS	Tue, Dec 7, 2021	6.69	7.13	6.69	7.06
6251	NASDAQ	CERS	Mon, Dec 6, 2021	6.63	6.63	6.35	6.52
6250	NASDAQ	CERS	Fri, Dec 3, 2021	6.92	6.92	6.56	6.64
6249	NASDAQ	CERS	Thu, Dec 2, 2021	6.75	6.99	6.68	6.91
6248	NASDAQ	CERS	Wed, Dec 1, 2021	7.00	7.01	6.70	6.71
6247	NASDAQ	CERS	Tue, Nov 30, 2021	6.88	7.05	6.77	6.89
6246	NASDAQ	CERS	Mon, Nov 29, 2021	7.06	7.10	6.90	6.93
6245	NASDAQ	CERS	Fri, Nov 26, 2021	7.04	7.20	6.93	6.98
6244	NASDAQ	CERS	Wed, Nov 24, 2021	7.01	7.18	6.85	7.17
6243	NASDAQ	CERS	Tue, Nov 23, 2021	7.12	7.17	6.95	7.11
6242	NASDAQ	CERS	Mon, Nov 22, 2021	7.24	7.28	7.10	7.12
6241	NASDAQ	CERS	Fri, Nov 19, 2021	7.16	7.33	7.15	7.20
6240	NASDAQ	CERS	Thu, Nov 18, 2021	7.34	7.34	7.05	7.17
6239	NASDAQ	CERS	Wed, Nov 17, 2021	7.20	7.36	7.15	7.29
6238	NASDAQ	CERS	Tue, Nov 16, 2021	7.10	7.35	7.01	7.25
6237	NASDAQ	CERS	Mon, Nov 15, 2021	7.31	7.31	7.04	7.13
6236	NASDAQ	CERS	Fri, Nov 12, 2021	7.30	7.38	7.26	7.29
6235	NASDAQ	CERS	Thu, Nov 11, 2021	7.31	7.42	7.23	7.31
6234	NASDAQ	CERS	Wed, Nov 10, 2021	7.42	7.55	7.27	7.30
6233	NASDAQ	CERS	Tue, Nov 9, 2021	7.74	7.79	7.48	7.50
6232	NASDAQ	CERS	Mon, Nov 8, 2021	7.73	7.99	7.73	7.77
6231	NASDAQ	CERS	Fri, Nov 5, 2021	7.91	8.06	7.80	7.90
6230	NASDAQ	CERS	Thu, Nov 4, 2021	7.82	7.99	7.75	7.93
6229	NASDAQ	CERS	Wed, Nov 3, 2021	7.00	8.00	6.98	7.80
6228	NASDAQ	CERS	Tue, Nov 2, 2021	6.88	6.90	6.64	6.69
6227	NASDAQ	CERS	Mon, Nov 1, 2021	6.59	6.85	6.59	6.81
6226	NASDAQ	CERS	Fri, Oct 29, 2021	6.55	6.64	6.27	6.60
6225	NASDAQ	CERS	Thu, Oct 28, 2021	6.28	6.56	6.27	6.54
6224	NASDAQ	CERS	Wed, Oct 27, 2021	6.27	6.33	6.19	6.26
6223	NASDAQ	CERS	Tue, Oct 26, 2021	6.26	6.35	6.20	6.29
6222	NASDAQ	CERS	Mon, Oct 25, 2021	6.23	6.33	6.17	6.25
6221	NASDAQ	CERS	Fri, Oct 22, 2021	6.29	6.29	6.18	6.24
6220	NASDAQ	CERS	Thu, Oct 21, 2021	6.35	6.42	6.31	6.32
6219	NASDAQ	CERS	Wed, Oct 20, 2021	6.42	6.43	6.26	6.33
6218	NASDAQ	CERS	Tue, Oct 19, 2021	6.15	6.42	6.12	6.41
6217	NASDAQ	CERS	Mon, Oct 18, 2021	6.10	6.19	6.05	6.09
6216	NASDAQ	CERS	Fri, Oct 15, 2021	6.28	6.29	6.10	6.12
6215	NASDAQ	CERS	Thu, Oct 14, 2021	6.20	6.35	6.15	6.20
6214	NASDAQ	CERS	Wed, Oct 13, 2021	6.14	6.23	6.07	6.12
6213	NASDAQ	CERS	Tue, Oct 12, 2021	6.04	6.16	5.99	6.11
6212	NASDAQ	CERS	Mon, Oct 11, 2021	5.99	6.09	5.92	5.98
6211	NASDAQ	CERS	Fri, Oct 8, 2021	6.13	6.13	5.99	6.03
6210	NASDAQ	CERS	Thu, Oct 7, 2021	6.16	6.22	6.10	6.12
6209	NASDAQ	CERS	Wed, Oct 6, 2021	5.99	6.11	5.95	6.09
6208	NASDAQ	CERS	Tue, Oct 5, 2021	5.98	6.18	5.94	6.05
6207	NASDAQ	CERS	Mon, Oct 4, 2021	6.13	6.16	5.90	5.97
6206	NASDAQ	CERS	Fri, Oct 1, 2021	6.12	6.20	6.02	6.16
6205	NASDAQ	CERS	Thu, Sep 30, 2021	6.14	6.31	6.09	6.09
6204	NASDAQ	CERS	Wed, Sep 29, 2021	6.22	6.28	6.04	6.09
6203	NASDAQ	CERS	Tue, Sep 28, 2021	6.37	6.45	6.18	6.19
6202	NASDAQ	CERS	Mon, Sep 27, 2021	6.57	6.58	6.29	6.44
6201	NASDAQ	CERS	Fri, Sep 24, 2021	6.62	6.70	6.56	6.58
6200	NASDAQ	CERS	Thu, Sep 23, 2021	6.51	6.69	6.42	6.68
6199	NASDAQ	CERS	Wed, Sep 22, 2021	6.42	6.50	6.28	6.41
6198	NASDAQ	CERS	Tue, Sep 21, 2021	6.39	6.50	6.35	6.37
6197	NASDAQ	CERS	Mon, Sep 20, 2021	6.48	6.62	6.33	6.37
6196	NASDAQ	CERS	Fri, Sep 17, 2021	6.30	6.68	6.27	6.66
6195	NASDAQ	CERS	Thu, Sep 16, 2021	6.22	6.32	6.08	6.25
6194	NASDAQ	CERS	Wed, Sep 15, 2021	6.15	6.24	6.05	6.19
6193	NASDAQ	CERS	Tue, Sep 14, 2021	6.13	6.18	6.04	6.08
6192	NASDAQ	CERS	Mon, Sep 13, 2021	6.22	6.25	6.02	6.11
6191	NASDAQ	CERS	Fri, Sep 10, 2021	6.30	6.40	6.20	6.21
6190	NASDAQ	CERS	Thu, Sep 9, 2021	6.31	6.43	6.23	6.28
6189	NASDAQ	CERS	Wed, Sep 8, 2021	6.36	6.43	6.25	6.28
6188	NASDAQ	CERS	Tue, Sep 7, 2021	6.45	6.55	6.37	6.39
6187	NASDAQ	CERS	Fri, Sep 3, 2021	6.55	6.60	6.47	6.49
6186	NASDAQ	CERS	Thu, Sep 2, 2021	6.47	6.62	6.47	6.55
6185	NASDAQ	CERS	Wed, Sep 1, 2021	6.48	6.54	6.38	6.45
6184	NASDAQ	CERS	Tue, Aug 31, 2021	6.40	6.46	6.33	6.45
6183	NASDAQ	CERS	Mon, Aug 30, 2021	6.38	6.50	6.33	6.37
6182	NASDAQ	CERS	Fri, Aug 27, 2021	6.11	6.41	6.08	6.34
6181	NASDAQ	CERS	Thu, Aug 26, 2021	6.20	6.28	6.08	6.10
6180	NASDAQ	CERS	Wed, Aug 25, 2021	6.21	6.23	6.09	6.20
6179	NASDAQ	CERS	Tue, Aug 24, 2021	6.09	6.27	6.09	6.24
6178	NASDAQ	CERS	Mon, Aug 23, 2021	5.96	6.22	5.91	6.08
6177	NASDAQ	CERS	Fri, Aug 20, 2021	5.66	5.95	5.66	5.89
6176	NASDAQ	CERS	Thu, Aug 19, 2021	5.81	5.85	5.67	5.69
6175	NASDAQ	CERS	Wed, Aug 18, 2021	5.93	6.04	5.80	5.84
6174	NASDAQ	CERS	Tue, Aug 17, 2021	5.85	5.92	5.74	5.87
6173	NASDAQ	CERS	Mon, Aug 16, 2021	6.09	6.10	5.84	5.90
6172	NASDAQ	CERS	Fri, Aug 13, 2021	6.19	6.19	6.00	6.01
6171	NASDAQ	CERS	Thu, Aug 12, 2021	6.03	6.20	6.03	6.18
6170	NASDAQ	CERS	Wed, Aug 11, 2021	6.20	6.20	6.01	6.08
6169	NASDAQ	CERS	Tue, Aug 10, 2021	6.37	6.40	6.14	6.19
6168	NASDAQ	CERS	Mon, Aug 9, 2021	6.25	6.58	6.19	6.41
6167	NASDAQ	CERS	Fri, Aug 6, 2021	6.18	6.25	6.12	6.23
6166	NASDAQ	CERS	Thu, Aug 5, 2021	6.09	6.31	6.06	6.24
6165	NASDAQ	CERS	Wed, Aug 4, 2021	5.85	6.40	5.82	6.19
6164	NASDAQ	CERS	Tue, Aug 3, 2021	5.10	5.14	5.00	5.13
6163	NASDAQ	CERS	Mon, Aug 2, 2021	5.14	5.14	4.99	5.11
6162	NASDAQ	CERS	Fri, Jul 30, 2021	5.03	5.11	4.99	5.04
6161	NASDAQ	CERS	Thu, Jul 29, 2021	4.97	5.07	4.97	5.04
6160	NASDAQ	CERS	Wed, Jul 28, 2021	4.79	5.02	4.79	4.97
6159	NASDAQ	CERS	Tue, Jul 27, 2021	4.79	4.83	4.67	4.80
6158	NASDAQ	CERS	Mon, Jul 26, 2021	4.99	5.03	4.83	4.83
6157	NASDAQ	CERS	Fri, Jul 23, 2021	5.05	5.11	4.88	4.98
6156	NASDAQ	CERS	Thu, Jul 22, 2021	5.09	5.20	5.01	5.03
6155	NASDAQ	CERS	Wed, Jul 21, 2021	5.04	5.18	4.98	5.11
6154	NASDAQ	CERS	Tue, Jul 20, 2021	4.95	5.08	4.91	5.01
6153	NASDAQ	CERS	Mon, Jul 19, 2021	4.78	4.98	4.78	4.93
6152	NASDAQ	CERS	Fri, Jul 16, 2021	4.76	4.91	4.72	4.89
6151	NASDAQ	CERS	Thu, Jul 15, 2021	4.89	4.92	4.67	4.79
6150	NASDAQ	CERS	Wed, Jul 14, 2021	5.07	5.08	4.83	4.90
6149	NASDAQ	CERS	Tue, Jul 13, 2021	5.11	5.16	5.03	5.05
6148	NASDAQ	CERS	Mon, Jul 12, 2021	5.27	5.27	5.00	5.15
6147	NASDAQ	CERS	Fri, Jul 9, 2021	5.25	5.32	5.10	5.27
6146	NASDAQ	CERS	Thu, Jul 8, 2021	5.11	5.27	4.99	5.25
6145	NASDAQ	CERS	Wed, Jul 7, 2021	5.44	5.46	5.19	5.21
6144	NASDAQ	CERS	Tue, Jul 6, 2021	5.56	5.60	5.41	5.44
6143	NASDAQ	CERS	Fri, Jul 2, 2021	6.12	6.12	5.61	5.61
6142	NASDAQ	CERS	Thu, Jul 1, 2021	5.92	6.13	5.90	6.01
6141	NASDAQ	CERS	Wed, Jun 30, 2021	5.67	5.93	5.67	5.91
6140	NASDAQ	CERS	Tue, Jun 29, 2021	5.77	5.79	5.64	5.66
6139	NASDAQ	CERS	Mon, Jun 28, 2021	5.86	5.96	5.73	5.75
6138	NASDAQ	CERS	Fri, Jun 25, 2021	5.78	5.85	5.74	5.84
6137	NASDAQ	CERS	Thu, Jun 24, 2021	5.71	5.83	5.69	5.73
6136	NASDAQ	CERS	Wed, Jun 23, 2021	5.62	5.75	5.62	5.70
6135	NASDAQ	CERS	Tue, Jun 22, 2021	5.69	5.72	5.53	5.61
6134	NASDAQ	CERS	Mon, Jun 21, 2021	5.70	5.83	5.62	5.71
6133	NASDAQ	CERS	Fri, Jun 18, 2021	5.86	5.97	5.71	5.71
6132	NASDAQ	CERS	Thu, Jun 17, 2021	5.75	6.05	5.73	5.90
6131	NASDAQ	CERS	Wed, Jun 16, 2021	5.80	5.85	5.58	5.74
6130	NASDAQ	CERS	Tue, Jun 15, 2021	5.90	5.90	5.72	5.80
6129	NASDAQ	CERS	Mon, Jun 14, 2021	5.98	6.01	5.87	5.89
6128	NASDAQ	CERS	Fri, Jun 11, 2021	5.84	5.97	5.83	5.94
6127	NASDAQ	CERS	Thu, Jun 10, 2021	5.64	5.82	5.59	5.79
6126	NASDAQ	CERS	Wed, Jun 9, 2021	5.67	5.78	5.60	5.63
6125	NASDAQ	CERS	Tue, Jun 8, 2021	5.57	5.68	5.53	5.64
6124	NASDAQ	CERS	Mon, Jun 7, 2021	5.29	5.54	5.25	5.49
6123	NASDAQ	CERS	Fri, Jun 4, 2021	5.44	5.48	5.32	5.35
6122	NASDAQ	CERS	Thu, Jun 3, 2021	5.59	5.69	5.40	5.41
6121	NASDAQ	CERS	Wed, Jun 2, 2021	5.73	5.84	5.57	5.62
6120	NASDAQ	CERS	Tue, Jun 1, 2021	5.91	5.92	5.63	5.72
6119	NASDAQ	CERS	Fri, May 28, 2021	5.77	5.92	5.77	5.79
6118	NASDAQ	CERS	Thu, May 27, 2021	5.82	5.90	5.69	5.72
6117	NASDAQ	CERS	Wed, May 26, 2021	5.88	5.91	5.76	5.86
6116	NASDAQ	CERS	Tue, May 25, 2021	5.90	5.96	5.78	5.84
6115	NASDAQ	CERS	Mon, May 24, 2021	5.86	5.97	5.80	5.87
6114	NASDAQ	CERS	Fri, May 21, 2021	5.94	6.07	5.80	5.81
6113	NASDAQ	CERS	Thu, May 20, 2021	5.85	5.97	5.78	5.86
6112	NASDAQ	CERS	Wed, May 19, 2021	5.66	5.83	5.56	5.80
6111	NASDAQ	CERS	Tue, May 18, 2021	5.90	6.00	5.68	5.82
6110	NASDAQ	CERS	Mon, May 17, 2021	5.68	5.85	5.66	5.79
6109	NASDAQ	CERS	Fri, May 14, 2021	5.65	5.85	5.65	5.75
6108	NASDAQ	CERS	Thu, May 13, 2021	5.62	5.77	5.45	5.55
6107	NASDAQ	CERS	Wed, May 12, 2021	5.42	5.72	5.35	5.57
6106	NASDAQ	CERS	Tue, May 11, 2021	5.56	5.81	5.55	5.63
6105	NASDAQ	CERS	Mon, May 10, 2021	6.06	6.13	5.69	5.78
6104	NASDAQ	CERS	Fri, May 7, 2021	6.10	6.30	6.03	6.14
6103	NASDAQ	CERS	Thu, May 6, 2021	5.99	6.04	5.86	5.96
6102	NASDAQ	CERS	Wed, May 5, 2021	5.79	6.25	5.72	6.02
6101	NASDAQ	CERS	Tue, May 4, 2021	5.76	5.78	5.56	5.60
6100	NASDAQ	CERS	Mon, May 3, 2021	6.10	6.14	5.85	5.86
6099	NASDAQ	CERS	Fri, Apr 30, 2021	5.87	6.10	5.82	6.10
6098	NASDAQ	CERS	Thu, Apr 29, 2021	6.25	6.26	5.88	5.98
6097	NASDAQ	CERS	Wed, Apr 28, 2021	6.04	6.37	6.03	6.19
6096	NASDAQ	CERS	Tue, Apr 27, 2021	6.22	6.23	6.10	6.17
6095	NASDAQ	CERS	Mon, Apr 26, 2021	6.17	6.27	6.07	6.19
6094	NASDAQ	CERS	Fri, Apr 23, 2021	6.05	6.15	5.95	6.08
6093	NASDAQ	CERS	Thu, Apr 22, 2021	6.00	6.18	5.95	6.03
6092	NASDAQ	CERS	Wed, Apr 21, 2021	5.85	6.02	5.64	6.00
6091	NASDAQ	CERS	Tue, Apr 20, 2021	5.86	6.06	5.76	5.84
6090	NASDAQ	CERS	Mon, Apr 19, 2021	6.06	6.09	5.84	5.92
6089	NASDAQ	CERS	Fri, Apr 16, 2021	6.34	6.39	6.09	6.18
6088	NASDAQ	CERS	Thu, Apr 15, 2021	6.31	6.39	6.24	6.35
6087	NASDAQ	CERS	Wed, Apr 14, 2021	6.29	6.49	6.21	6.22
6086	NASDAQ	CERS	Tue, Apr 13, 2021	6.08	6.30	6.05	6.26
6085	NASDAQ	CERS	Mon, Apr 12, 2021	6.00	6.12	5.93	6.07
6084	NASDAQ	CERS	Fri, Apr 9, 2021	6.05	6.14	5.93	6.13
6083	NASDAQ	CERS	Thu, Apr 8, 2021	6.00	6.12	5.90	6.07
6082	NASDAQ	CERS	Wed, Apr 7, 2021	6.03	6.12	5.85	5.91
6081	NASDAQ	CERS	Tue, Apr 6, 2021	5.99	6.29	5.96	6.08
6080	NASDAQ	CERS	Mon, Apr 5, 2021	6.14	6.28	5.88	5.95
6079	NASDAQ	CERS	Thu, Apr 1, 2021	6.16	6.45	6.07	6.08
6078	NASDAQ	CERS	Wed, Mar 31, 2021	5.90	6.12	5.89	6.01
6077	NASDAQ	CERS	Tue, Mar 30, 2021	5.75	5.91	5.55	5.82
6076	NASDAQ	CERS	Mon, Mar 29, 2021	5.96	5.97	5.57	5.75
6075	NASDAQ	CERS	Fri, Mar 26, 2021	5.69	5.96	5.51	5.96
6074	NASDAQ	CERS	Thu, Mar 25, 2021	5.66	5.76	5.46	5.68
6073	NASDAQ	CERS	Wed, Mar 24, 2021	6.20	6.20	5.78	5.83
6072	NASDAQ	CERS	Tue, Mar 23, 2021	6.21	6.29	6.03	6.10
6071	NASDAQ	CERS	Mon, Mar 22, 2021	6.14	6.33	6.10	6.21
6070	NASDAQ	CERS	Fri, Mar 19, 2021	5.93	6.21	5.82	6.11
6069	NASDAQ	CERS	Thu, Mar 18, 2021	6.23	6.28	5.91	5.93
6068	NASDAQ	CERS	Wed, Mar 17, 2021	6.22	6.51	5.97	6.36
6067	NASDAQ	CERS	Tue, Mar 16, 2021	6.39	6.52	6.23	6.38
6066	NASDAQ	CERS	Mon, Mar 15, 2021	6.34	6.45	6.27	6.42
6065	NASDAQ	CERS	Fri, Mar 12, 2021	6.49	6.49	6.26	6.39
6064	NASDAQ	CERS	Thu, Mar 11, 2021	6.48	6.67	6.44	6.52
6063	NASDAQ	CERS	Wed, Mar 10, 2021	6.42	6.63	6.21	6.34
6062	NASDAQ	CERS	Tue, Mar 9, 2021	5.99	6.40	5.99	6.28
6061	NASDAQ	CERS	Mon, Mar 8, 2021	6.24	6.28	5.71	5.76
6060	NASDAQ	CERS	Fri, Mar 5, 2021	6.00	6.26	5.51	6.20
6059	NASDAQ	CERS	Thu, Mar 4, 2021	6.23	6.33	5.69	5.90
6058	NASDAQ	CERS	Wed, Mar 3, 2021	6.38	6.38	6.03	6.28
6057	NASDAQ	CERS	Tue, Mar 2, 2021	6.49	6.62	6.28	6.46
6056	NASDAQ	CERS	Mon, Mar 1, 2021	6.49	6.66	6.29	6.52
6055	NASDAQ	CERS	Fri, Feb 26, 2021	6.26	6.69	5.90	6.14
6054	NASDAQ	CERS	Thu, Feb 25, 2021	6.70	6.83	6.10	6.45
6053	NASDAQ	CERS	Wed, Feb 24, 2021	6.71	6.93	6.50	6.72
6052	NASDAQ	CERS	Tue, Feb 23, 2021	7.04	7.04	6.37	6.77
6051	NASDAQ	CERS	Mon, Feb 22, 2021	7.36	7.46	7.10	7.24
6050	NASDAQ	CERS	Fri, Feb 19, 2021	7.31	7.64	7.31	7.49
6049	NASDAQ	CERS	Thu, Feb 18, 2021	7.40	7.55	7.02	7.30
6048	NASDAQ	CERS	Wed, Feb 17, 2021	7.62	7.88	7.37	7.55
6047	NASDAQ	CERS	Tue, Feb 16, 2021	7.78	7.95	7.62	7.75
6046	NASDAQ	CERS	Fri, Feb 12, 2021	7.42	7.62	7.26	7.55
6045	NASDAQ	CERS	Thu, Feb 11, 2021	7.85	7.88	7.41	7.50
6044	NASDAQ	CERS	Wed, Feb 10, 2021	7.98	8.39	7.64	7.68
6043	NASDAQ	CERS	Tue, Feb 9, 2021	7.91	8.21	7.83	7.85
6042	NASDAQ	CERS	Mon, Feb 8, 2021	7.65	8.41	7.64	7.87
6041	NASDAQ	CERS	Fri, Feb 5, 2021	7.64	7.72	7.35	7.54
6040	NASDAQ	CERS	Thu, Feb 4, 2021	7.32	7.62	7.22	7.50
6039	NASDAQ	CERS	Wed, Feb 3, 2021	7.38	7.58	7.25	7.25
6038	NASDAQ	CERS	Tue, Feb 2, 2021	6.96	7.45	6.91	7.29
6037	NASDAQ	CERS	Mon, Feb 1, 2021	6.66	6.81	6.54	6.76
6036	NASDAQ	CERS	Fri, Jan 29, 2021	6.71	6.78	6.45	6.59
6035	NASDAQ	CERS	Thu, Jan 28, 2021	6.65	6.95	6.56	6.73
6034	NASDAQ	CERS	Wed, Jan 27, 2021	6.87	6.94	6.25	6.55
6033	NASDAQ	CERS	Tue, Jan 26, 2021	7.30	7.36	6.94	6.95
6032	NASDAQ	CERS	Mon, Jan 25, 2021	7.35	7.50	6.97	7.28
6031	NASDAQ	CERS	Fri, Jan 22, 2021	7.14	7.39	7.14	7.26
6030	NASDAQ	CERS	Thu, Jan 21, 2021	7.36	7.39	7.07	7.23
6029	NASDAQ	CERS	Wed, Jan 20, 2021	7.50	7.69	7.28	7.29
6028	NASDAQ	CERS	Tue, Jan 19, 2021	7.35	7.54	7.16	7.28
6027	NASDAQ	CERS	Fri, Jan 15, 2021	7.57	7.86	7.23	7.25
6026	NASDAQ	CERS	Thu, Jan 14, 2021	7.66	7.93	7.53	7.55
6025	NASDAQ	CERS	Wed, Jan 13, 2021	7.35	7.68	7.35	7.44
6024	NASDAQ	CERS	Tue, Jan 12, 2021	7.27	7.45	7.14	7.32
6023	NASDAQ	CERS	Mon, Jan 11, 2021	7.07	7.55	7.02	7.22
6022	NASDAQ	CERS	Fri, Jan 8, 2021	7.42	7.77	7.35	7.36
6021	NASDAQ	CERS	Thu, Jan 7, 2021	7.02	7.49	7.02	7.41
6020	NASDAQ	CERS	Wed, Jan 6, 2021	7.10	7.37	6.92	6.99
6019	NASDAQ	CERS	Tue, Jan 5, 2021	6.90	7.03	6.84	6.99
6018	NASDAQ	CERS	Mon, Jan 4, 2021	7.00	7.14	6.79	6.94
6017	NASDAQ	CERS	Thu, Dec 31, 2020	7.10	7.15	6.81	6.92
6016	NASDAQ	CERS	Wed, Dec 30, 2020	7.20	7.60	7.17	7.17
6015	NASDAQ	CERS	Tue, Dec 29, 2020	7.75	7.81	7.01	7.18
6014	NASDAQ	CERS	Mon, Dec 28, 2020	8.15	8.45	7.79	7.80
6013	NASDAQ	CERS	Thu, Dec 24, 2020	8.36	8.53	8.06	8.07
6012	NASDAQ	CERS	Wed, Dec 23, 2020	8.83	8.87	8.17	8.17
6011	NASDAQ	CERS	Tue, Dec 22, 2020	7.70	8.68	7.67	8.56
6010	NASDAQ	CERS	Mon, Dec 21, 2020	6.98	7.71	6.92	7.50
6009	NASDAQ	CERS	Fri, Dec 18, 2020	7.00	7.05	6.72	7.02
6008	NASDAQ	CERS	Thu, Dec 17, 2020	6.86	7.08	6.76	6.98
6007	NASDAQ	CERS	Wed, Dec 16, 2020	7.04	7.11	6.83	6.83
6006	NASDAQ	CERS	Tue, Dec 15, 2020	7.16	7.32	6.91	7.09
6005	NASDAQ	CERS	Mon, Dec 14, 2020	7.63	7.90	7.13	7.13
6004	NASDAQ	CERS	Fri, Dec 11, 2020	7.74	8.02	7.59	7.68
6003	NASDAQ	CERS	Thu, Dec 10, 2020	7.38	7.82	7.35	7.78
6002	NASDAQ	CERS	Wed, Dec 9, 2020	7.50	7.76	7.33	7.46
6001	NASDAQ	CERS	Tue, Dec 8, 2020	7.31	7.57	7.22	7.41
6000	NASDAQ	CERS	Mon, Dec 7, 2020	7.26	7.70	7.26	7.34
5999	NASDAQ	CERS	Fri, Dec 4, 2020	7.03	7.30	7.03	7.19
5998	NASDAQ	CERS	Thu, Dec 3, 2020	7.09	7.13	6.83	7.00
5997	NASDAQ	CERS	Wed, Dec 2, 2020	6.75	7.19	6.71	7.04
5996	NASDAQ	CERS	Tue, Dec 1, 2020	6.73	7.00	6.68	6.79
5995	NASDAQ	CERS	Mon, Nov 30, 2020	6.70	6.84	6.46	6.65
5994	NASDAQ	CERS	Fri, Nov 27, 2020	6.12	6.59	6.12	6.58
5993	NASDAQ	CERS	Wed, Nov 25, 2020	5.87	6.11	5.81	6.02
5992	NASDAQ	CERS	Tue, Nov 24, 2020	6.27	6.31	5.85	5.87
5991	NASDAQ	CERS	Mon, Nov 23, 2020	6.29	6.41	6.20	6.26
5990	NASDAQ	CERS	Fri, Nov 20, 2020	6.15	6.36	6.10	6.23
5989	NASDAQ	CERS	Thu, Nov 19, 2020	6.30	6.30	6.06	6.23
5988	NASDAQ	CERS	Wed, Nov 18, 2020	6.42	6.52	6.20	6.32
5987	NASDAQ	CERS	Tue, Nov 17, 2020	5.98	6.40	5.97	6.39
5986	NASDAQ	CERS	Mon, Nov 16, 2020	6.15	6.20	5.97	6.05
5985	NASDAQ	CERS	Fri, Nov 13, 2020	6.08	6.14	5.97	6.08
5984	NASDAQ	CERS	Thu, Nov 12, 2020	5.89	6.07	5.82	6.05
5983	NASDAQ	CERS	Wed, Nov 11, 2020	5.72	5.96	5.62	5.89
5982	NASDAQ	CERS	Tue, Nov 10, 2020	5.61	5.85	5.40	5.67
5981	NASDAQ	CERS	Mon, Nov 9, 2020	5.81	6.06	5.60	5.60
5980	NASDAQ	CERS	Fri, Nov 6, 2020	5.77	5.83	5.51	5.52
5979	NASDAQ	CERS	Thu, Nov 5, 2020	5.72	5.92	5.66	5.77
5978	NASDAQ	CERS	Wed, Nov 4, 2020	5.61	5.82	5.61	5.65
5977	NASDAQ	CERS	Tue, Nov 3, 2020	5.42	5.60	5.37	5.53
5976	NASDAQ	CERS	Mon, Nov 2, 2020	5.30	5.46	5.28	5.35
5975	NASDAQ	CERS	Fri, Oct 30, 2020	5.65	5.80	5.15	5.25
5974	NASDAQ	CERS	Thu, Oct 29, 2020	5.51	5.57	5.37	5.56
5973	NASDAQ	CERS	Wed, Oct 28, 2020	5.85	5.90	5.55	5.55
5972	NASDAQ	CERS	Tue, Oct 27, 2020	5.92	6.03	5.84	5.96
5971	NASDAQ	CERS	Mon, Oct 26, 2020	6.25	6.34	5.91	5.95
5970	NASDAQ	CERS	Fri, Oct 23, 2020	6.35	6.41	6.25	6.34
5969	NASDAQ	CERS	Thu, Oct 22, 2020	6.22	6.34	6.08	6.31
5968	NASDAQ	CERS	Wed, Oct 21, 2020	6.43	6.47	6.21	6.23
5967	NASDAQ	CERS	Tue, Oct 20, 2020	6.41	6.56	6.38	6.42
5966	NASDAQ	CERS	Mon, Oct 19, 2020	6.44	6.75	6.43	6.44
5965	NASDAQ	CERS	Fri, Oct 16, 2020	6.49	6.59	6.32	6.43
5964	NASDAQ	CERS	Thu, Oct 15, 2020	6.65	6.74	6.45	6.51
5963	NASDAQ	CERS	Wed, Oct 14, 2020	6.77	7.01	6.72	6.74
5962	NASDAQ	CERS	Tue, Oct 13, 2020	6.72	6.89	6.52	6.72
5961	NASDAQ	CERS	Mon, Oct 12, 2020	6.93	7.00	6.65	6.67
5960	NASDAQ	CERS	Fri, Oct 9, 2020	6.60	6.87	6.58	6.82
5959	NASDAQ	CERS	Thu, Oct 8, 2020	6.66	6.76	6.55	6.58
5958	NASDAQ	CERS	Wed, Oct 7, 2020	6.42	6.74	6.42	6.56
5957	NASDAQ	CERS	Tue, Oct 6, 2020	6.28	6.62	6.23	6.36
5956	NASDAQ	CERS	Mon, Oct 5, 2020	6.10	6.30	6.08	6.25
5955	NASDAQ	CERS	Fri, Oct 2, 2020	6.00	6.12	5.91	6.04
5954	NASDAQ	CERS	Thu, Oct 1, 2020	6.29	6.35	6.14	6.16
5953	NASDAQ	CERS	Wed, Sep 30, 2020	6.35	6.40	6.20	6.26
5952	NASDAQ	CERS	Tue, Sep 29, 2020	6.13	6.40	6.08	6.35
5951	NASDAQ	CERS	Mon, Sep 28, 2020	6.15	6.22	6.05	6.13
5950	NASDAQ	CERS	Fri, Sep 25, 2020	5.88	6.09	5.86	6.08
5949	NASDAQ	CERS	Thu, Sep 24, 2020	5.82	6.04	5.76	5.90
5948	NASDAQ	CERS	Wed, Sep 23, 2020	6.21	6.27	5.88	5.89
5947	NASDAQ	CERS	Tue, Sep 22, 2020	6.24	6.27	6.04	6.24
5946	NASDAQ	CERS	Mon, Sep 21, 2020	6.24	6.25	6.09	6.19
5945	NASDAQ	CERS	Fri, Sep 18, 2020	6.40	6.42	6.24	6.33
5944	NASDAQ	CERS	Thu, Sep 17, 2020	6.32	6.38	6.18	6.33
5943	NASDAQ	CERS	Wed, Sep 16, 2020	6.44	6.52	6.33	6.41
5942	NASDAQ	CERS	Tue, Sep 15, 2020	6.39	6.49	6.29	6.41
5941	NASDAQ	CERS	Mon, Sep 14, 2020	6.20	6.37	6.16	6.33
5940	NASDAQ	CERS	Fri, Sep 11, 2020	6.06	6.28	6.06	6.17
5939	NASDAQ	CERS	Thu, Sep 10, 2020	6.09	6.29	6.03	6.05
5938	NASDAQ	CERS	Wed, Sep 9, 2020	5.85	6.14	5.81	6.08
5937	NASDAQ	CERS	Tue, Sep 8, 2020	5.71	5.85	5.67	5.78
5936	NASDAQ	CERS	Fri, Sep 4, 2020	6.10	6.12	5.59	5.81
5935	NASDAQ	CERS	Thu, Sep 3, 2020	6.17	6.20	5.91	6.10
5934	NASDAQ	CERS	Wed, Sep 2, 2020	6.30	6.34	6.15	6.25
5933	NASDAQ	CERS	Tue, Sep 1, 2020	6.33	6.43	6.19	6.29
5932	NASDAQ	CERS	Mon, Aug 31, 2020	6.27	6.58	6.19	6.37
5931	NASDAQ	CERS	Fri, Aug 28, 2020	6.11	6.26	6.05	6.26
5930	NASDAQ	CERS	Thu, Aug 27, 2020	6.41	6.48	6.00	6.12
5929	NASDAQ	CERS	Wed, Aug 26, 2020	6.30	6.40	6.18	6.39
5928	NASDAQ	CERS	Tue, Aug 25, 2020	6.87	6.88	6.26	6.32
5927	NASDAQ	CERS	Mon, Aug 24, 2020	7.94	7.94	6.80	6.83
5926	NASDAQ	CERS	Fri, Aug 21, 2020	7.06	7.09	6.95	7.07
5925	NASDAQ	CERS	Thu, Aug 20, 2020	7.03	7.13	6.95	7.07
5924	NASDAQ	CERS	Wed, Aug 19, 2020	6.84	7.17	6.78	7.07
5923	NASDAQ	CERS	Tue, Aug 18, 2020	7.08	7.21	7.03	7.20
5922	NASDAQ	CERS	Mon, Aug 17, 2020	6.98	7.08	6.82	7.07
5921	NASDAQ	CERS	Fri, Aug 14, 2020	7.04	7.06	6.93	6.99
5920	NASDAQ	CERS	Thu, Aug 13, 2020	6.96	7.12	6.95	7.05
5919	NASDAQ	CERS	Wed, Aug 12, 2020	6.81	7.04	6.81	6.95
5918	NASDAQ	CERS	Tue, Aug 11, 2020	7.02	7.11	6.83	6.85
5917	NASDAQ	CERS	Mon, Aug 10, 2020	7.01	7.17	6.85	7.05
5916	NASDAQ	CERS	Fri, Aug 7, 2020	7.22	7.23	7.00	7.06
5915	NASDAQ	CERS	Thu, Aug 6, 2020	7.24	7.25	6.91	7.10
5914	NASDAQ	CERS	Wed, Aug 5, 2020	7.50	7.52	7.14	7.28
5913	NASDAQ	CERS	Tue, Aug 4, 2020	7.43	7.56	7.21	7.47
5912	NASDAQ	CERS	Mon, Aug 3, 2020	7.14	7.44	7.09	7.41
5911	NASDAQ	CERS	Fri, Jul 31, 2020	7.04	7.20	6.96	7.13
5910	NASDAQ	CERS	Thu, Jul 30, 2020	7.11	7.43	6.88	7.19
5909	NASDAQ	CERS	Wed, Jul 29, 2020	6.80	7.13	6.80	7.02
5908	NASDAQ	CERS	Tue, Jul 28, 2020	6.77	6.94	6.71	6.77
5907	NASDAQ	CERS	Mon, Jul 27, 2020	6.60	6.84	6.53	6.80
5906	NASDAQ	CERS	Fri, Jul 24, 2020	6.52	6.71	6.38	6.54
5905	NASDAQ	CERS	Thu, Jul 23, 2020	6.64	6.90	6.59	6.61
5904	NASDAQ	CERS	Wed, Jul 22, 2020	6.75	6.82	6.62	6.68
5903	NASDAQ	CERS	Tue, Jul 21, 2020	6.95	7.05	6.73	6.77
5902	NASDAQ	CERS	Mon, Jul 20, 2020	6.70	7.05	6.65	6.88
5901	NASDAQ	CERS	Fri, Jul 17, 2020	6.57	6.79	6.50	6.77
5900	NASDAQ	CERS	Thu, Jul 16, 2020	6.71	6.77	6.49	6.56
5899	NASDAQ	CERS	Wed, Jul 15, 2020	6.78	6.94	6.68	6.81
5898	NASDAQ	CERS	Tue, Jul 14, 2020	6.71	6.84	6.41	6.68
5897	NASDAQ	CERS	Mon, Jul 13, 2020	6.97	7.31	6.70	6.72
5896	NASDAQ	CERS	Fri, Jul 10, 2020	6.95	7.00	6.82	6.83
5895	NASDAQ	CERS	Thu, Jul 9, 2020	7.07	7.13	6.82	7.00
5894	NASDAQ	CERS	Wed, Jul 8, 2020	7.13	7.24	6.83	7.07
5893	NASDAQ	CERS	Tue, Jul 7, 2020	7.21	7.49	6.94	7.12
5892	NASDAQ	CERS	Mon, Jul 6, 2020	6.87	7.03	6.80	6.86
5891	NASDAQ	CERS	Thu, Jul 2, 2020	6.83	6.90	6.63	6.76
5890	NASDAQ	CERS	Wed, Jul 1, 2020	6.58	6.84	6.53	6.76
5889	NASDAQ	CERS	Tue, Jun 30, 2020	6.48	6.63	6.34	6.60
5888	NASDAQ	CERS	Mon, Jun 29, 2020	6.90	6.90	6.37	6.52
5887	NASDAQ	CERS	Fri, Jun 26, 2020	6.98	7.17	6.84	6.86
5886	NASDAQ	CERS	Thu, Jun 25, 2020	6.61	7.05	6.51	7.02
5885	NASDAQ	CERS	Wed, Jun 24, 2020	6.68	6.85	6.58	6.66
5884	NASDAQ	CERS	Tue, Jun 23, 2020	6.65	6.83	6.57	6.75
5883	NASDAQ	CERS	Mon, Jun 22, 2020	6.31	6.55	6.21	6.55
5882	NASDAQ	CERS	Fri, Jun 19, 2020	6.25	6.49	6.21	6.32
5881	NASDAQ	CERS	Thu, Jun 18, 2020	6.15	6.33	6.11	6.17
5880	NASDAQ	CERS	Wed, Jun 17, 2020	6.30	6.37	6.12	6.18
5879	NASDAQ	CERS	Tue, Jun 16, 2020	6.45	6.85	6.16	6.27
5878	NASDAQ	CERS	Mon, Jun 15, 2020	5.92	6.37	5.84	6.30
5877	NASDAQ	CERS	Fri, Jun 12, 2020	5.94	6.12	5.75	6.04
5876	NASDAQ	CERS	Thu, Jun 11, 2020	6.35	6.37	5.59	5.60
5875	NASDAQ	CERS	Wed, Jun 10, 2020	5.83	6.72	5.82	6.66
5874	NASDAQ	CERS	Tue, Jun 9, 2020	5.77	5.94	5.68	5.83
5873	NASDAQ	CERS	Mon, Jun 8, 2020	5.88	6.04	5.79	5.84
5872	NASDAQ	CERS	Fri, Jun 5, 2020	6.00	6.22	5.72	5.90
5871	NASDAQ	CERS	Thu, Jun 4, 2020	6.29	6.35	5.83	5.85
5870	NASDAQ	CERS	Wed, Jun 3, 2020	6.43	6.53	6.33	6.37
5869	NASDAQ	CERS	Tue, Jun 2, 2020	6.49	6.56	6.21	6.41
5868	NASDAQ	CERS	Mon, Jun 1, 2020	6.19	6.65	6.18	6.49
5867	NASDAQ	CERS	Fri, May 29, 2020	6.04	6.23	5.98	6.22
5866	NASDAQ	CERS	Thu, May 28, 2020	5.99	6.25	5.95	6.08
5865	NASDAQ	CERS	Wed, May 27, 2020	6.07	6.07	5.70	5.95
5864	NASDAQ	CERS	Tue, May 26, 2020	6.02	6.19	5.90	5.96
5863	NASDAQ	CERS	Fri, May 22, 2020	5.57	5.93	5.46	5.92
5862	NASDAQ	CERS	Thu, May 21, 2020	5.49	5.63	5.43	5.56
5861	NASDAQ	CERS	Wed, May 20, 2020	5.38	5.55	5.32	5.51
5860	NASDAQ	CERS	Tue, May 19, 2020	5.45	5.49	5.29	5.30
5859	NASDAQ	CERS	Mon, May 18, 2020	5.40	5.58	5.37	5.49
5858	NASDAQ	CERS	Fri, May 15, 2020	5.17	5.26	5.07	5.24
5857	NASDAQ	CERS	Thu, May 14, 2020	5.13	5.34	5.05	5.22
5856	NASDAQ	CERS	Wed, May 13, 2020	5.67	5.68	5.11	5.24
5855	NASDAQ	CERS	Tue, May 12, 2020	5.73	5.79	5.56	5.59
5854	NASDAQ	CERS	Mon, May 11, 2020	5.42	5.53	5.35	5.46
5853	NASDAQ	CERS	Fri, May 8, 2020	5.66	5.67	5.46	5.47
5852	NASDAQ	CERS	Thu, May 7, 2020	5.41	5.66	5.29	5.56
5851	NASDAQ	CERS	Wed, May 6, 2020	5.24	5.65	5.22	5.31
5850	NASDAQ	CERS	Tue, May 5, 2020	5.33	5.50	5.20	5.34
5849	NASDAQ	CERS	Mon, May 4, 2020	5.76	5.90	5.12	5.20
5848	NASDAQ	CERS	Fri, May 1, 2020	6.00	6.04	5.52	5.62
5847	NASDAQ	CERS	Thu, Apr 30, 2020	6.28	6.50	6.12	6.15
5846	NASDAQ	CERS	Wed, Apr 29, 2020	6.19	6.19	5.95	6.14
5845	NASDAQ	CERS	Tue, Apr 28, 2020	6.31	6.31	5.81	6.01
5844	NASDAQ	CERS	Mon, Apr 27, 2020	5.71	6.40	5.65	6.16
5843	NASDAQ	CERS	Fri, Apr 24, 2020	5.40	5.80	5.40	5.66
5842	NASDAQ	CERS	Thu, Apr 23, 2020	5.31	5.48	5.27	5.37
5841	NASDAQ	CERS	Wed, Apr 22, 2020	5.25	5.49	5.20	5.32
5840	NASDAQ	CERS	Tue, Apr 21, 2020	5.50	5.50	5.13	5.15
5839	NASDAQ	CERS	Mon, Apr 20, 2020	5.14	5.46	5.09	5.44
5838	NASDAQ	CERS	Fri, Apr 17, 2020	5.20	5.30	5.04	5.27
5837	NASDAQ	CERS	Thu, Apr 16, 2020	5.08	5.15	4.89	5.14
5836	NASDAQ	CERS	Wed, Apr 15, 2020	4.99	5.15	4.87	5.03
5835	NASDAQ	CERS	Tue, Apr 14, 2020	5.25	5.36	5.19	5.21
5834	NASDAQ	CERS	Mon, Apr 13, 2020	5.14	5.24	4.97	5.18
5833	NASDAQ	CERS	Thu, Apr 9, 2020	5.14	5.22	4.97	5.20
5832	NASDAQ	CERS	Wed, Apr 8, 2020	4.90	5.25	4.84	5.01
5831	NASDAQ	CERS	Tue, Apr 7, 2020	4.93	5.03	4.72	4.82
5830	NASDAQ	CERS	Mon, Apr 6, 2020	4.70	5.08	4.70	4.86
5829	NASDAQ	CERS	Fri, Apr 3, 2020	4.52	4.62	4.43	4.57
5828	NASDAQ	CERS	Thu, Apr 2, 2020	4.55	4.67	4.36	4.53
5827	NASDAQ	CERS	Wed, Apr 1, 2020	4.75	4.75	4.43	4.50
5826	NASDAQ	CERS	Tue, Mar 31, 2020	4.64	4.74	4.43	4.65
5825	NASDAQ	CERS	Mon, Mar 30, 2020	4.44	4.70	4.34	4.67
5824	NASDAQ	CERS	Fri, Mar 27, 2020	4.17	4.56	3.97	4.33
5823	NASDAQ	CERS	Thu, Mar 26, 2020	4.33	4.53	4.19	4.36
5822	NASDAQ	CERS	Wed, Mar 25, 2020	3.93	4.35	3.82	4.04
5821	NASDAQ	CERS	Tue, Mar 24, 2020	3.71	3.89	3.54	3.85
5820	NASDAQ	CERS	Mon, Mar 23, 2020	3.28	3.66	3.20	3.46
5819	NASDAQ	CERS	Fri, Mar 20, 2020	3.25	3.47	3.13	3.17
5818	NASDAQ	CERS	Thu, Mar 19, 2020	2.94	3.45	2.91	3.16
5817	NASDAQ	CERS	Wed, Mar 18, 2020	3.51	3.54	2.71	2.87
5816	NASDAQ	CERS	Tue, Mar 17, 2020	3.62	3.76	3.31	3.75
5815	NASDAQ	CERS	Mon, Mar 16, 2020	3.64	3.75	3.43	3.64
5814	NASDAQ	CERS	Fri, Mar 13, 2020	4.12	4.27	3.62	4.11
5813	NASDAQ	CERS	Thu, Mar 12, 2020	4.42	4.52	3.93	4.03
5812	NASDAQ	CERS	Wed, Mar 11, 2020	5.05	5.13	4.64	4.76
5811	NASDAQ	CERS	Tue, Mar 10, 2020	5.10	5.17	4.94	5.16
5810	NASDAQ	CERS	Mon, Mar 9, 2020	5.29	5.29	4.89	4.96
5809	NASDAQ	CERS	Fri, Mar 6, 2020	5.19	5.68	5.16	5.49
5808	NASDAQ	CERS	Thu, Mar 5, 2020	5.33	5.44	5.18	5.28
5807	NASDAQ	CERS	Wed, Mar 4, 2020	5.09	5.45	5.04	5.37
5806	NASDAQ	CERS	Tue, Mar 3, 2020	5.11	5.20	4.96	5.03
5805	NASDAQ	CERS	Mon, Mar 2, 2020	5.19	5.19	4.86	5.11
5804	NASDAQ	CERS	Fri, Feb 28, 2020	5.03	5.22	4.85	5.14
5803	NASDAQ	CERS	Thu, Feb 27, 2020	5.50	5.50	5.05	5.18
5802	NASDAQ	CERS	Wed, Feb 26, 2020	5.07	5.29	4.94	5.25
5801	NASDAQ	CERS	Tue, Feb 25, 2020	5.10	5.13	4.81	4.90
5800	NASDAQ	CERS	Mon, Feb 24, 2020	4.99	5.16	4.85	5.03
5799	NASDAQ	CERS	Fri, Feb 21, 2020	5.27	5.40	5.06	5.16
5798	NASDAQ	CERS	Thu, Feb 20, 2020	5.20	5.45	4.99	5.41
5797	NASDAQ	CERS	Wed, Feb 19, 2020	4.83	5.24	4.73	5.21
5796	NASDAQ	CERS	Tue, Feb 18, 2020	4.98	5.05	4.73	4.79
5795	NASDAQ	CERS	Fri, Feb 14, 2020	4.83	4.99	4.74	4.90
5794	NASDAQ	CERS	Thu, Feb 13, 2020	4.66	4.93	4.61	4.82
5793	NASDAQ	CERS	Wed, Feb 12, 2020	4.76	4.80	4.67	4.69
5792	NASDAQ	CERS	Tue, Feb 11, 2020	4.77	4.82	4.66	4.72
5791	NASDAQ	CERS	Mon, Feb 10, 2020	4.91	4.97	4.71	4.76
5790	NASDAQ	CERS	Fri, Feb 7, 2020	4.98	5.04	4.88	4.96
5789	NASDAQ	CERS	Thu, Feb 6, 2020	4.95	5.13	4.81	4.94
5788	NASDAQ	CERS	Wed, Feb 5, 2020	4.87	4.97	4.66	4.94
5787	NASDAQ	CERS	Tue, Feb 4, 2020	4.38	4.88	4.38	4.81
5786	NASDAQ	CERS	Mon, Feb 3, 2020	4.07	4.39	4.07	4.28
5785	NASDAQ	CERS	Fri, Jan 31, 2020	4.14	4.21	3.94	4.01
5784	NASDAQ	CERS	Thu, Jan 30, 2020	4.17	4.28	4.12	4.17
5783	NASDAQ	CERS	Wed, Jan 29, 2020	4.28	4.39	4.15	4.22
5782	NASDAQ	CERS	Tue, Jan 28, 2020	4.49	4.52	4.12	4.15
5781	NASDAQ	CERS	Mon, Jan 27, 2020	4.67	4.70	4.42	4.49
5780	NASDAQ	CERS	Fri, Jan 24, 2020	4.50	4.69	4.48	4.57
5779	NASDAQ	CERS	Thu, Jan 23, 2020	4.48	4.62	4.24	4.48
5778	NASDAQ	CERS	Wed, Jan 22, 2020	4.48	4.52	4.25	4.30
5777	NASDAQ	CERS	Tue, Jan 21, 2020	4.41	4.53	4.17	4.48
5776	NASDAQ	CERS	Fri, Jan 17, 2020	4.24	4.28	4.02	4.07
5775	NASDAQ	CERS	Thu, Jan 16, 2020	4.34	4.37	4.06	4.20
5774	NASDAQ	CERS	Wed, Jan 15, 2020	4.36	4.42	4.25	4.31
5773	NASDAQ	CERS	Tue, Jan 14, 2020	4.29	4.43	4.22	4.36
5772	NASDAQ	CERS	Mon, Jan 13, 2020	4.78	4.82	4.29	4.31
5771	NASDAQ	CERS	Fri, Jan 10, 2020	4.66	4.74	4.54	4.68
5770	NASDAQ	CERS	Thu, Jan 9, 2020	4.52	4.69	4.45	4.60
5769	NASDAQ	CERS	Wed, Jan 8, 2020	4.71	4.78	4.50	4.52
5768	NASDAQ	CERS	Tue, Jan 7, 2020	4.50	4.83	4.47	4.72
5767	NASDAQ	CERS	Mon, Jan 6, 2020	4.26	4.49	4.26	4.46
5766	NASDAQ	CERS	Fri, Jan 3, 2020	4.15	4.36	4.15	4.31
5765	NASDAQ	CERS	Thu, Jan 2, 2020	4.25	4.26	4.10	4.25
5764	NASDAQ	CERS	Tue, Dec 31, 2019	4.09	4.23	4.07	4.22
5763	NASDAQ	CERS	Mon, Dec 30, 2019	4.30	4.31	4.12	4.13
5762	NASDAQ	CERS	Fri, Dec 27, 2019	4.28	4.30	4.22	4.28
5761	NASDAQ	CERS	Thu, Dec 26, 2019	4.35	4.38	4.25	4.28
5760	NASDAQ	CERS	Tue, Dec 24, 2019	4.25	4.34	4.22	4.34
5759	NASDAQ	CERS	Mon, Dec 23, 2019	4.16	4.33	4.05	4.25
5758	NASDAQ	CERS	Fri, Dec 20, 2019	4.15	4.20	4.08	4.16
5757	NASDAQ	CERS	Thu, Dec 19, 2019	4.22	4.22	4.11	4.15
5756	NASDAQ	CERS	Wed, Dec 18, 2019	4.17	4.26	4.09	4.22
5755	NASDAQ	CERS	Tue, Dec 17, 2019	3.99	4.15	3.92	4.11
5754	NASDAQ	CERS	Mon, Dec 16, 2019	4.01	4.03	3.94	3.96
5753	NASDAQ	CERS	Fri, Dec 13, 2019	4.03	4.13	3.99	3.99
5752	NASDAQ	CERS	Thu, Dec 12, 2019	3.88	4.04	3.86	4.03
5751	NASDAQ	CERS	Wed, Dec 11, 2019	3.86	3.87	3.75	3.85
5750	NASDAQ	CERS	Tue, Dec 10, 2019	3.84	3.89	3.70	3.84
5749	NASDAQ	CERS	Mon, Dec 9, 2019	4.08	4.08	3.83	3.87
5748	NASDAQ	CERS	Fri, Dec 6, 2019	4.14	4.14	3.99	4.09
5747	NASDAQ	CERS	Thu, Dec 5, 2019	4.20	4.21	4.07	4.08
5746	NASDAQ	CERS	Wed, Dec 4, 2019	4.22	4.25	4.17	4.18
5745	NASDAQ	CERS	Tue, Dec 3, 2019	4.12	4.29	4.12	4.20
5744	NASDAQ	CERS	Mon, Dec 2, 2019	4.29	4.36	4.14	4.18
5743	NASDAQ	CERS	Fri, Nov 29, 2019	4.15	4.36	4.15	4.34
5742	NASDAQ	CERS	Wed, Nov 27, 2019	4.14	4.17	4.06	4.14
5741	NASDAQ	CERS	Tue, Nov 26, 2019	4.17	4.17	4.07	4.12
5740	NASDAQ	CERS	Mon, Nov 25, 2019	4.26	4.29	4.13	4.17
5739	NASDAQ	CERS	Fri, Nov 22, 2019	4.33	4.33	4.19	4.22
5738	NASDAQ	CERS	Thu, Nov 21, 2019	4.35	4.42	4.28	4.32
5737	NASDAQ	CERS	Wed, Nov 20, 2019	4.30	4.43	4.30	4.34
5736	NASDAQ	CERS	Tue, Nov 19, 2019	4.40	4.41	4.30	4.32
5735	NASDAQ	CERS	Mon, Nov 18, 2019	4.48	4.48	4.32	4.37
5734	NASDAQ	CERS	Fri, Nov 15, 2019	4.37	4.53	4.33	4.47
5733	NASDAQ	CERS	Thu, Nov 14, 2019	4.34	4.39	4.26	4.34
5732	NASDAQ	CERS	Wed, Nov 13, 2019	4.51	4.60	4.25	4.31
5731	NASDAQ	CERS	Tue, Nov 12, 2019	4.05	4.36	4.05	4.28
5730	NASDAQ	CERS	Mon, Nov 11, 2019	4.05	4.11	3.95	4.09
5729	NASDAQ	CERS	Fri, Nov 8, 2019	4.12	4.21	4.10	4.11
5728	NASDAQ	CERS	Thu, Nov 7, 2019	4.15	4.25	4.02	4.24
5727	NASDAQ	CERS	Wed, Nov 6, 2019	4.33	4.36	4.16	4.18
5726	NASDAQ	CERS	Tue, Nov 5, 2019	4.38	4.42	4.28	4.33
5725	NASDAQ	CERS	Mon, Nov 4, 2019	4.65	4.66	4.36	4.38
5724	NASDAQ	CERS	Fri, Nov 1, 2019	4.36	4.68	4.34	4.64
5723	NASDAQ	CERS	Thu, Oct 31, 2019	4.17	4.45	3.95	4.35
5722	NASDAQ	CERS	Wed, Oct 30, 2019	4.55	4.57	4.40	4.50
5721	NASDAQ	CERS	Tue, Oct 29, 2019	4.55	4.58	4.47	4.55
5720	NASDAQ	CERS	Mon, Oct 28, 2019	4.40	4.55	4.40	4.54
5719	NASDAQ	CERS	Fri, Oct 25, 2019	4.34	4.40	4.33	4.40
5718	NASDAQ	CERS	Thu, Oct 24, 2019	4.44	4.44	4.33	4.38
5717	NASDAQ	CERS	Wed, Oct 23, 2019	4.44	4.47	4.34	4.41
5716	NASDAQ	CERS	Tue, Oct 22, 2019	4.50	4.52	4.40	4.41
5715	NASDAQ	CERS	Mon, Oct 21, 2019	4.55	4.55	4.44	4.49
5714	NASDAQ	CERS	Fri, Oct 18, 2019	4.41	4.56	4.39	4.47
5713	NASDAQ	CERS	Thu, Oct 17, 2019	4.43	4.46	4.38	4.45
5712	NASDAQ	CERS	Wed, Oct 16, 2019	4.52	4.55	4.38	4.41
5711	NASDAQ	CERS	Tue, Oct 15, 2019	4.30	4.56	4.30	4.51
5710	NASDAQ	CERS	Mon, Oct 14, 2019	4.51	4.51	4.29	4.30
5709	NASDAQ	CERS	Fri, Oct 11, 2019	4.47	4.58	4.40	4.49
5708	NASDAQ	CERS	Thu, Oct 10, 2019	4.50	4.52	4.32	4.44
5707	NASDAQ	CERS	Wed, Oct 9, 2019	4.46	4.53	4.42	4.49
5706	NASDAQ	CERS	Tue, Oct 8, 2019	4.55	4.62	4.41	4.45
5705	NASDAQ	CERS	Mon, Oct 7, 2019	4.65	4.71	4.59	4.62
5704	NASDAQ	CERS	Fri, Oct 4, 2019	4.74	4.80	4.59	4.65
5703	NASDAQ	CERS	Thu, Oct 3, 2019	4.77	4.80	4.64	4.72
5702	NASDAQ	CERS	Wed, Oct 2, 2019	4.79	4.79	4.61	4.77
5701	NASDAQ	CERS	Tue, Oct 1, 2019	5.16	5.18	4.81	4.86
5700	NASDAQ	CERS	Mon, Sep 30, 2019	5.02	5.32	4.86	5.16
5699	NASDAQ	CERS	Fri, Sep 27, 2019	4.95	5.04	4.78	4.86
5698	NASDAQ	CERS	Thu, Sep 26, 2019	5.14	5.14	4.90	4.95
5697	NASDAQ	CERS	Wed, Sep 25, 2019	4.96	5.14	4.87	5.10
5696	NASDAQ	CERS	Tue, Sep 24, 2019	5.26	5.30	4.95	4.97
5695	NASDAQ	CERS	Mon, Sep 23, 2019	5.31	5.37	5.21	5.25
5694	NASDAQ	CERS	Fri, Sep 20, 2019	5.31	5.35	5.22	5.33
5693	NASDAQ	CERS	Thu, Sep 19, 2019	5.29	5.39	5.25	5.31
5692	NASDAQ	CERS	Wed, Sep 18, 2019	5.29	5.33	5.26	5.30
5691	NASDAQ	CERS	Tue, Sep 17, 2019	5.36	5.42	5.21	5.28
5690	NASDAQ	CERS	Mon, Sep 16, 2019	5.28	5.50	5.23	5.38
5689	NASDAQ	CERS	Fri, Sep 13, 2019	5.30	5.40	5.24	5.32
5688	NASDAQ	CERS	Thu, Sep 12, 2019	5.40	5.44	5.20	5.27
5687	NASDAQ	CERS	Wed, Sep 11, 2019	5.20	5.40	5.15	5.39
5686	NASDAQ	CERS	Tue, Sep 10, 2019	4.97	5.20	4.81	5.15
5685	NASDAQ	CERS	Mon, Sep 9, 2019	5.06	5.06	4.93	4.96
5684	NASDAQ	CERS	Fri, Sep 6, 2019	5.15	5.18	5.04	5.05
5683	NASDAQ	CERS	Thu, Sep 5, 2019	5.09	5.18	4.99	5.13
5682	NASDAQ	CERS	Wed, Sep 4, 2019	5.31	5.31	5.03	5.03
5681	NASDAQ	CERS	Tue, Sep 3, 2019	5.34	5.34	5.22	5.28
5680	NASDAQ	CERS	Fri, Aug 30, 2019	5.35	5.47	5.33	5.37
5679	NASDAQ	CERS	Thu, Aug 29, 2019	5.40	5.45	5.25	5.33
5678	NASDAQ	CERS	Wed, Aug 28, 2019	5.35	5.41	5.18	5.33
5677	NASDAQ	CERS	Tue, Aug 27, 2019	5.28	5.33	5.14	5.21
5676	NASDAQ	CERS	Mon, Aug 26, 2019	5.36	5.36	5.16	5.25
5675	NASDAQ	CERS	Fri, Aug 23, 2019	5.44	5.46	5.19	5.28
5674	NASDAQ	CERS	Thu, Aug 22, 2019	5.55	5.55	5.34	5.40
5673	NASDAQ	CERS	Wed, Aug 21, 2019	5.50	5.56	5.42	5.51
5672	NASDAQ	CERS	Tue, Aug 20, 2019	5.56	5.58	5.41	5.43
5671	NASDAQ	CERS	Mon, Aug 19, 2019	5.55	5.61	5.47	5.57
5670	NASDAQ	CERS	Fri, Aug 16, 2019	5.25	5.52	5.23	5.48
5669	NASDAQ	CERS	Thu, Aug 15, 2019	5.23	5.24	5.14	5.21
5668	NASDAQ	CERS	Wed, Aug 14, 2019	5.23	5.33	5.17	5.22
5667	NASDAQ	CERS	Tue, Aug 13, 2019	5.31	5.45	5.26	5.33
5666	NASDAQ	CERS	Mon, Aug 12, 2019	5.20	5.35	5.16	5.31
5665	NASDAQ	CERS	Fri, Aug 9, 2019	5.27	5.34	5.17	5.23
5664	NASDAQ	CERS	Thu, Aug 8, 2019	5.09	5.29	5.09	5.25
5663	NASDAQ	CERS	Wed, Aug 7, 2019	5.03	5.05	4.91	5.04
5662	NASDAQ	CERS	Tue, Aug 6, 2019	5.01	5.16	4.82	5.06
5661	NASDAQ	CERS	Mon, Aug 5, 2019	5.26	5.27	4.91	5.03
5660	NASDAQ	CERS	Fri, Aug 2, 2019	5.55	5.79	5.28	5.34
5659	NASDAQ	CERS	Thu, Aug 1, 2019	5.83	5.89	5.65	5.85
5658	NASDAQ	CERS	Wed, Jul 31, 2019	6.03	6.15	5.75	5.85
5657	NASDAQ	CERS	Tue, Jul 30, 2019	5.84	6.11	5.81	6.05
5656	NASDAQ	CERS	Mon, Jul 29, 2019	5.90	5.92	5.71	5.89
5655	NASDAQ	CERS	Fri, Jul 26, 2019	5.73	5.94	5.68	5.89
5654	NASDAQ	CERS	Thu, Jul 25, 2019	5.88	5.88	5.68	5.69
5653	NASDAQ	CERS	Wed, Jul 24, 2019	5.63	5.85	5.57	5.84
5652	NASDAQ	CERS	Tue, Jul 23, 2019	5.65	5.75	5.58	5.70
5651	NASDAQ	CERS	Mon, Jul 22, 2019	5.55	5.72	5.50	5.64
5650	NASDAQ	CERS	Fri, Jul 19, 2019	5.58	5.61	5.50	5.52
5649	NASDAQ	CERS	Thu, Jul 18, 2019	5.61	5.62	5.51	5.61
5648	NASDAQ	CERS	Wed, Jul 17, 2019	5.48	5.65	5.33	5.58
5647	NASDAQ	CERS	Tue, Jul 16, 2019	5.50	5.53	5.41	5.49
5646	NASDAQ	CERS	Mon, Jul 15, 2019	5.51	5.54	5.41	5.50
5645	NASDAQ	CERS	Fri, Jul 12, 2019	5.52	5.54	5.40	5.51
5644	NASDAQ	CERS	Thu, Jul 11, 2019	5.40	5.53	5.33	5.50
5643	NASDAQ	CERS	Wed, Jul 10, 2019	5.36	5.44	5.30	5.43
5642	NASDAQ	CERS	Tue, Jul 9, 2019	5.31	5.36	5.26	5.32
5641	NASDAQ	CERS	Mon, Jul 8, 2019	5.40	5.45	5.32	5.36
5640	NASDAQ	CERS	Fri, Jul 5, 2019	5.30	5.44	5.27	5.40
5639	NASDAQ	CERS	Wed, Jul 3, 2019	5.25	5.27	5.20	5.25
5638	NASDAQ	CERS	Tue, Jul 2, 2019	5.36	5.44	5.19	5.22
5637	NASDAQ	CERS	Mon, Jul 1, 2019	5.64	5.69	5.34	5.38
5636	NASDAQ	CERS	Fri, Jun 28, 2019	4.94	5.66	4.94	5.62
5635	NASDAQ	CERS	Thu, Jun 27, 2019	4.81	4.96	4.80	4.94
5634	NASDAQ	CERS	Wed, Jun 26, 2019	4.90	4.93	4.80	4.80
5633	NASDAQ	CERS	Tue, Jun 25, 2019	4.82	4.96	4.82	4.89
5632	NASDAQ	CERS	Mon, Jun 24, 2019	4.93	4.98	4.81	4.81
5631	NASDAQ	CERS	Fri, Jun 21, 2019	4.96	4.99	4.85	4.95
5630	NASDAQ	CERS	Thu, Jun 20, 2019	4.98	5.07	4.95	4.99
5629	NASDAQ	CERS	Wed, Jun 19, 2019	4.81	4.97	4.81	4.92
5628	NASDAQ	CERS	Tue, Jun 18, 2019	4.76	4.94	4.76	4.82
5627	NASDAQ	CERS	Mon, Jun 17, 2019	4.57	4.88	4.56	4.76
5626	NASDAQ	CERS	Fri, Jun 14, 2019	4.65	4.67	4.55	4.56
5625	NASDAQ	CERS	Thu, Jun 13, 2019	4.67	4.72	4.63	4.66
5624	NASDAQ	CERS	Wed, Jun 12, 2019	4.56	4.75	4.56	4.68
5623	NASDAQ	CERS	Tue, Jun 11, 2019	4.69	4.72	4.49	4.56
5622	NASDAQ	CERS	Mon, Jun 10, 2019	4.72	4.84	4.64	4.65
5621	NASDAQ	CERS	Fri, Jun 7, 2019	4.77	4.82	4.66	4.69
5620	NASDAQ	CERS	Thu, Jun 6, 2019	4.78	4.85	4.67	4.75
5619	NASDAQ	CERS	Wed, Jun 5, 2019	4.89	4.98	4.76	4.80
5618	NASDAQ	CERS	Tue, Jun 4, 2019	4.60	4.79	4.56	4.70
5617	NASDAQ	CERS	Mon, Jun 3, 2019	4.66	4.71	4.49	4.51
5616	NASDAQ	CERS	Fri, May 31, 2019	4.85	4.90	4.68	4.69
5615	NASDAQ	CERS	Thu, May 30, 2019	5.00	5.07	4.87	4.94
5614	NASDAQ	CERS	Wed, May 29, 2019	5.17	5.21	4.99	5.01
5613	NASDAQ	CERS	Tue, May 28, 2019	5.20	5.42	5.18	5.21
5612	NASDAQ	CERS	Fri, May 24, 2019	5.12	5.25	4.99	5.19
5611	NASDAQ	CERS	Thu, May 23, 2019	5.19	5.25	4.95	5.11
5610	NASDAQ	CERS	Wed, May 22, 2019	5.31	5.37	5.24	5.25
5609	NASDAQ	CERS	Tue, May 21, 2019	5.40	5.45	5.28	5.32
5608	NASDAQ	CERS	Mon, May 20, 2019	5.42	5.54	5.38	5.39
5607	NASDAQ	CERS	Fri, May 17, 2019	5.43	5.56	5.43	5.47
5606	NASDAQ	CERS	Thu, May 16, 2019	5.50	5.60	5.44	5.49
5605	NASDAQ	CERS	Wed, May 15, 2019	5.44	5.69	5.43	5.53
5604	NASDAQ	CERS	Tue, May 14, 2019	5.53	5.73	5.44	5.46
5603	NASDAQ	CERS	Mon, May 13, 2019	5.46	5.54	5.39	5.48
5602	NASDAQ	CERS	Fri, May 10, 2019	5.50	5.67	5.42	5.54
5601	NASDAQ	CERS	Thu, May 9, 2019	5.67	5.77	5.45	5.50
5600	NASDAQ	CERS	Wed, May 8, 2019	6.00	6.00	5.14	5.73
5599	NASDAQ	CERS	Tue, May 7, 2019	6.47	6.61	6.39	6.57
5598	NASDAQ	CERS	Mon, May 6, 2019	6.11	6.60	6.05	6.53
5597	NASDAQ	CERS	Fri, May 3, 2019	6.36	6.41	6.14	6.19
5596	NASDAQ	CERS	Thu, May 2, 2019	6.12	6.33	6.05	6.33
5595	NASDAQ	CERS	Wed, May 1, 2019	6.17	6.25	6.12	6.13
5594	NASDAQ	CERS	Tue, Apr 30, 2019	6.11	6.17	6.06	6.13
5593	NASDAQ	CERS	Mon, Apr 29, 2019	6.05	6.20	6.02	6.10
5592	NASDAQ	CERS	Fri, Apr 26, 2019	6.00	6.08	5.94	6.04
5591	NASDAQ	CERS	Thu, Apr 25, 2019	6.00	6.07	5.88	6.01
5590	NASDAQ	CERS	Wed, Apr 24, 2019	6.10	6.18	5.99	6.03
5589	NASDAQ	CERS	Tue, Apr 23, 2019	5.92	6.17	5.90	6.07
5588	NASDAQ	CERS	Mon, Apr 22, 2019	5.72	5.95	5.68	5.90
5587	NASDAQ	CERS	Thu, Apr 18, 2019	5.80	5.88	5.66	5.75
5586	NASDAQ	CERS	Wed, Apr 17, 2019	6.12	6.16	5.73	5.80
5585	NASDAQ	CERS	Tue, Apr 16, 2019	6.31	6.40	6.08	6.10
5584	NASDAQ	CERS	Mon, Apr 15, 2019	6.37	6.42	6.18	6.27
5583	NASDAQ	CERS	Fri, Apr 12, 2019	6.48	6.48	6.33	6.35
5582	NASDAQ	CERS	Thu, Apr 11, 2019	6.52	6.52	6.41	6.43
5581	NASDAQ	CERS	Wed, Apr 10, 2019	6.55	6.64	6.45	6.54
5580	NASDAQ	CERS	Tue, Apr 9, 2019	6.57	6.63	6.54	6.54
5579	NASDAQ	CERS	Mon, Apr 8, 2019	6.49	6.61	6.45	6.60
5578	NASDAQ	CERS	Fri, Apr 5, 2019	6.40	6.53	6.39	6.51
5577	NASDAQ	CERS	Thu, Apr 4, 2019	6.35	6.46	6.30	6.39
5576	NASDAQ	CERS	Wed, Apr 3, 2019	6.16	6.34	6.14	6.33
5575	NASDAQ	CERS	Tue, Apr 2, 2019	6.08	6.21	5.99	6.14
5574	NASDAQ	CERS	Mon, Apr 1, 2019	6.26	6.28	6.05	6.10
5573	NASDAQ	CERS	Fri, Mar 29, 2019	6.20	6.28	6.14	6.23
5572	NASDAQ	CERS	Thu, Mar 28, 2019	6.12	6.20	6.09	6.19
5571	NASDAQ	CERS	Wed, Mar 27, 2019	6.10	6.15	5.99	6.10
5570	NASDAQ	CERS	Tue, Mar 26, 2019	6.22	6.27	6.09	6.14
5569	NASDAQ	CERS	Mon, Mar 25, 2019	6.14	6.23	6.04	6.15
5568	NASDAQ	CERS	Fri, Mar 22, 2019	6.43	6.46	6.10	6.16
5567	NASDAQ	CERS	Thu, Mar 21, 2019	6.35	6.52	6.35	6.46
5566	NASDAQ	CERS	Wed, Mar 20, 2019	6.30	6.46	6.27	6.38
5565	NASDAQ	CERS	Tue, Mar 19, 2019	6.28	6.37	6.18	6.34
5564	NASDAQ	CERS	Mon, Mar 18, 2019	6.14	6.32	6.11	6.22
5563	NASDAQ	CERS	Fri, Mar 15, 2019	6.20	6.32	6.09	6.12
5562	NASDAQ	CERS	Thu, Mar 14, 2019	6.28	6.34	6.13	6.17
5561	NASDAQ	CERS	Wed, Mar 13, 2019	5.87	6.47	5.85	6.28
5560	NASDAQ	CERS	Tue, Mar 12, 2019	6.26	6.54	6.23	6.41
5559	NASDAQ	CERS	Mon, Mar 11, 2019	6.49	6.49	6.37	6.40
5558	NASDAQ	CERS	Fri, Mar 8, 2019	6.45	6.52	6.42	6.48
5557	NASDAQ	CERS	Thu, Mar 7, 2019	6.40	6.57	6.34	6.48
5556	NASDAQ	CERS	Wed, Mar 6, 2019	6.63	6.63	6.39	6.44
5555	NASDAQ	CERS	Tue, Mar 5, 2019	6.60	6.71	6.58	6.59
5554	NASDAQ	CERS	Mon, Mar 4, 2019	6.83	6.84	6.49	6.59
5553	NASDAQ	CERS	Fri, Mar 1, 2019	6.57	6.88	6.47	6.85
5552	NASDAQ	CERS	Thu, Feb 28, 2019	6.57	6.65	6.24	6.51
5551	NASDAQ	CERS	Wed, Feb 27, 2019	6.03	6.70	5.72	6.61
5550	NASDAQ	CERS	Tue, Feb 26, 2019	6.39	6.40	6.10	6.30
5549	NASDAQ	CERS	Mon, Feb 25, 2019	6.62	6.64	6.42	6.43
5548	NASDAQ	CERS	Fri, Feb 22, 2019	6.64	6.67	6.51	6.60
5547	NASDAQ	CERS	Thu, Feb 21, 2019	6.65	6.71	6.52	6.60
5546	NASDAQ	CERS	Wed, Feb 20, 2019	6.55	6.70	6.52	6.66
5545	NASDAQ	CERS	Tue, Feb 19, 2019	6.49	6.57	6.49	6.53
5544	NASDAQ	CERS	Fri, Feb 15, 2019	6.30	6.48	6.26	6.47
5543	NASDAQ	CERS	Thu, Feb 14, 2019	6.38	6.47	6.23	6.25
5542	NASDAQ	CERS	Wed, Feb 13, 2019	6.26	6.42	6.17	6.41
5541	NASDAQ	CERS	Tue, Feb 12, 2019	5.98	6.36	5.98	6.28
5540	NASDAQ	CERS	Mon, Feb 11, 2019	5.88	6.00	5.83	5.94
5539	NASDAQ	CERS	Fri, Feb 8, 2019	5.89	5.94	5.81	5.85
5538	NASDAQ	CERS	Thu, Feb 7, 2019	5.95	5.98	5.76	5.91
5537	NASDAQ	CERS	Wed, Feb 6, 2019	6.00	6.05	5.92	5.97
5536	NASDAQ	CERS	Tue, Feb 5, 2019	6.05	6.10	5.93	6.00
5535	NASDAQ	CERS	Mon, Feb 4, 2019	5.91	6.06	5.85	6.04
5534	NASDAQ	CERS	Fri, Feb 1, 2019	5.97	6.02	5.86	5.91
5533	NASDAQ	CERS	Thu, Jan 31, 2019	5.72	6.01	5.72	5.96
5532	NASDAQ	CERS	Wed, Jan 30, 2019	5.70	5.79	5.65	5.72
5531	NASDAQ	CERS	Tue, Jan 29, 2019	5.61	5.74	5.61	5.69
5530	NASDAQ	CERS	Mon, Jan 28, 2019	5.72	5.76	5.55	5.61
5529	NASDAQ	CERS	Fri, Jan 25, 2019	5.64	5.77	5.54	5.74
5528	NASDAQ	CERS	Thu, Jan 24, 2019	5.42	5.63	5.41	5.60
5527	NASDAQ	CERS	Wed, Jan 23, 2019	5.64	5.69	5.41	5.44
5526	NASDAQ	CERS	Tue, Jan 22, 2019	5.67	5.67	5.56	5.63
5525	NASDAQ	CERS	Fri, Jan 18, 2019	5.66	5.76	5.63	5.68
5524	NASDAQ	CERS	Thu, Jan 17, 2019	5.65	5.71	5.61	5.65
5523	NASDAQ	CERS	Wed, Jan 16, 2019	5.69	5.79	5.66	5.67
5522	NASDAQ	CERS	Tue, Jan 15, 2019	5.65	5.70	5.56	5.68
5521	NASDAQ	CERS	Mon, Jan 14, 2019	5.59	5.68	5.51	5.65
5520	NASDAQ	CERS	Fri, Jan 11, 2019	5.66	5.75	5.53	5.61
5519	NASDAQ	CERS	Thu, Jan 10, 2019	5.65	5.72	5.52	5.69
5518	NASDAQ	CERS	Wed, Jan 9, 2019	5.63	5.78	5.60	5.71
5517	NASDAQ	CERS	Tue, Jan 8, 2019	5.63	5.72	5.50	5.59
5516	NASDAQ	CERS	Mon, Jan 7, 2019	5.36	5.73	5.36	5.64
5515	NASDAQ	CERS	Fri, Jan 4, 2019	5.24	5.51	5.19	5.39
5514	NASDAQ	CERS	Thu, Jan 3, 2019	5.31	5.39	5.15	5.16
5513	NASDAQ	CERS	Wed, Jan 2, 2019	4.98	5.35	4.93	5.34
5512	NASDAQ	CERS	Mon, Dec 31, 2018	5.02	5.09	4.99	5.07
5511	NASDAQ	CERS	Fri, Dec 28, 2018	4.89	5.13	4.82	4.99
5510	NASDAQ	CERS	Thu, Dec 27, 2018	4.87	4.93	4.73	4.89
5509	NASDAQ	CERS	Wed, Dec 26, 2018	4.97	5.00	4.79	4.97
5508	NASDAQ	CERS	Mon, Dec 24, 2018	4.92	4.98	4.85	4.92
5507	NASDAQ	CERS	Fri, Dec 21, 2018	4.94	5.06	4.94	4.99
5506	NASDAQ	CERS	Thu, Dec 20, 2018	5.50	5.50	4.71	4.92
5505	NASDAQ	CERS	Wed, Dec 19, 2018	5.54	5.62	5.34	5.50
5504	NASDAQ	CERS	Tue, Dec 18, 2018	5.50	5.70	5.42	5.53
5503	NASDAQ	CERS	Mon, Dec 17, 2018	5.50	5.66	5.40	5.46
5502	NASDAQ	CERS	Fri, Dec 14, 2018	5.64	5.69	5.50	5.53
5501	NASDAQ	CERS	Thu, Dec 13, 2018	5.72	5.79	5.62	5.67
5500	NASDAQ	CERS	Wed, Dec 12, 2018	5.64	5.82	5.63	5.75
5499	NASDAQ	CERS	Tue, Dec 11, 2018	5.56	5.61	5.41	5.55
5498	NASDAQ	CERS	Mon, Dec 10, 2018	5.35	5.53	5.33	5.51
5497	NASDAQ	CERS	Fri, Dec 7, 2018	5.55	5.63	5.24	5.35
5496	NASDAQ	CERS	Thu, Dec 6, 2018	5.50	5.66	5.50	5.57
5495	NASDAQ	CERS	Tue, Dec 4, 2018	5.34	5.77	5.29	5.43
5494	NASDAQ	CERS	Mon, Dec 3, 2018	5.34	5.36	5.14	5.35
5493	NASDAQ	CERS	Fri, Nov 30, 2018	5.21	5.29	5.16	5.25
5492	NASDAQ	CERS	Thu, Nov 29, 2018	5.24	5.31	5.13	5.20
5491	NASDAQ	CERS	Wed, Nov 28, 2018	5.22	5.29	5.06	5.28
5490	NASDAQ	CERS	Tue, Nov 27, 2018	5.28	5.31	5.13	5.18
5489	NASDAQ	CERS	Mon, Nov 26, 2018	5.40	5.47	5.27	5.33
5488	NASDAQ	CERS	Fri, Nov 23, 2018	5.29	5.43	5.28	5.32
5487	NASDAQ	CERS	Wed, Nov 21, 2018	5.27	5.39	5.16	5.33
5486	NASDAQ	CERS	Tue, Nov 20, 2018	5.00	5.28	4.98	5.23
5485	NASDAQ	CERS	Mon, Nov 19, 2018	5.24	5.28	5.04	5.10
5484	NASDAQ	CERS	Fri, Nov 16, 2018	5.15	5.38	5.15	5.28
5483	NASDAQ	CERS	Thu, Nov 15, 2018	5.04	5.35	4.96	5.30
5482	NASDAQ	CERS	Wed, Nov 14, 2018	5.34	5.43	5.03	5.05
5481	NASDAQ	CERS	Tue, Nov 13, 2018	5.30	5.50	5.28	5.30
5480	NASDAQ	CERS	Mon, Nov 12, 2018	5.69	5.69	5.17	5.27
5479	NASDAQ	CERS	Fri, Nov 9, 2018	5.84	5.86	5.70	5.73
5478	NASDAQ	CERS	Thu, Nov 8, 2018	5.90	5.94	5.81	5.89
5477	NASDAQ	CERS	Wed, Nov 7, 2018	5.79	5.95	5.79	5.90
5476	NASDAQ	CERS	Tue, Nov 6, 2018	5.75	5.84	5.56	5.80
5475	NASDAQ	CERS	Mon, Nov 5, 2018	6.35	6.47	5.76	5.76
5474	NASDAQ	CERS	Fri, Nov 2, 2018	6.28	6.82	6.27	6.37
5473	NASDAQ	CERS	Thu, Nov 1, 2018	6.72	6.77	6.49	6.77
5472	NASDAQ	CERS	Wed, Oct 31, 2018	6.77	6.81	6.43	6.70
5471	NASDAQ	CERS	Tue, Oct 30, 2018	6.27	6.39	6.17	6.29
5470	NASDAQ	CERS	Mon, Oct 29, 2018	6.44	6.49	6.17	6.27
5469	NASDAQ	CERS	Fri, Oct 26, 2018	6.40	6.56	6.30	6.38
5468	NASDAQ	CERS	Thu, Oct 25, 2018	6.40	6.62	6.39	6.50
5467	NASDAQ	CERS	Wed, Oct 24, 2018	6.54	6.64	6.35	6.35
5466	NASDAQ	CERS	Tue, Oct 23, 2018	6.35	6.60	6.35	6.54
5465	NASDAQ	CERS	Mon, Oct 22, 2018	6.66	6.72	6.38	6.57
5464	NASDAQ	CERS	Fri, Oct 19, 2018	6.74	6.87	6.61	6.63
5463	NASDAQ	CERS	Thu, Oct 18, 2018	6.68	7.06	6.66	6.77
5462	NASDAQ	CERS	Wed, Oct 17, 2018	6.82	6.84	6.55	6.69
5461	NASDAQ	CERS	Tue, Oct 16, 2018	6.13	6.91	6.06	6.88
5460	NASDAQ	CERS	Mon, Oct 15, 2018	5.97	6.01	5.79	5.96
5459	NASDAQ	CERS	Fri, Oct 12, 2018	6.02	6.13	5.91	5.99
5458	NASDAQ	CERS	Thu, Oct 11, 2018	5.78	6.08	5.71	5.89
5457	NASDAQ	CERS	Wed, Oct 10, 2018	6.16	6.16	5.84	5.85
5456	NASDAQ	CERS	Tue, Oct 9, 2018	6.27	6.41	6.15	6.16
5455	NASDAQ	CERS	Mon, Oct 8, 2018	6.52	6.52	6.25	6.31
5454	NASDAQ	CERS	Fri, Oct 5, 2018	6.55	6.69	6.38	6.49
5453	NASDAQ	CERS	Thu, Oct 4, 2018	7.00	7.00	6.54	6.55
5452	NASDAQ	CERS	Wed, Oct 3, 2018	7.10	7.15	6.99	7.02
5451	NASDAQ	CERS	Tue, Oct 2, 2018	7.17	7.26	7.08	7.09
5450	NASDAQ	CERS	Mon, Oct 1, 2018	7.22	7.27	7.08	7.16
5449	NASDAQ	CERS	Fri, Sep 28, 2018	7.26	7.31	7.18	7.21
5448	NASDAQ	CERS	Thu, Sep 27, 2018	7.26	7.32	7.25	7.27
5447	NASDAQ	CERS	Wed, Sep 26, 2018	7.44	7.44	7.25	7.26
5446	NASDAQ	CERS	Tue, Sep 25, 2018	7.40	7.54	7.28	7.42
5445	NASDAQ	CERS	Mon, Sep 24, 2018	7.38	7.41	7.34	7.38
5444	NASDAQ	CERS	Fri, Sep 21, 2018	7.37	7.43	7.34	7.36
5443	NASDAQ	CERS	Thu, Sep 20, 2018	7.35	7.41	7.28	7.38
5442	NASDAQ	CERS	Wed, Sep 19, 2018	7.27	7.33	7.21	7.31
5441	NASDAQ	CERS	Tue, Sep 18, 2018	7.16	7.29	7.12	7.25
5440	NASDAQ	CERS	Mon, Sep 17, 2018	7.27	7.29	7.09	7.13
5439	NASDAQ	CERS	Fri, Sep 14, 2018	7.35	7.48	7.24	7.25
5438	NASDAQ	CERS	Thu, Sep 13, 2018	7.25	7.35	7.18	7.34
5437	NASDAQ	CERS	Wed, Sep 12, 2018	7.20	7.31	7.08	7.21
5436	NASDAQ	CERS	Tue, Sep 11, 2018	7.12	7.22	7.00	7.21
5435	NASDAQ	CERS	Mon, Sep 10, 2018	7.29	7.33	7.12	7.13
5434	NASDAQ	CERS	Fri, Sep 7, 2018	7.28	7.47	7.21	7.27
5433	NASDAQ	CERS	Thu, Sep 6, 2018	7.53	7.60	7.32	7.33
5432	NASDAQ	CERS	Wed, Sep 5, 2018	7.74	7.74	7.45	7.52
5431	NASDAQ	CERS	Tue, Sep 4, 2018	7.79	7.80	7.63	7.74
5430	NASDAQ	CERS	Fri, Aug 31, 2018	7.66	7.81	7.64	7.78
5429	NASDAQ	CERS	Thu, Aug 30, 2018	7.53	7.75	7.49	7.66
5428	NASDAQ	CERS	Wed, Aug 29, 2018	7.49	7.74	7.47	7.57
5427	NASDAQ	CERS	Tue, Aug 28, 2018	7.48	7.60	7.36	7.51
5426	NASDAQ	CERS	Mon, Aug 27, 2018	7.11	7.49	7.10	7.45
5425	NASDAQ	CERS	Fri, Aug 24, 2018	7.08	7.17	7.01	7.11
5424	NASDAQ	CERS	Thu, Aug 23, 2018	7.05	7.17	6.98	7.09
5423	NASDAQ	CERS	Wed, Aug 22, 2018	6.89	7.14	6.88	7.05
5422	NASDAQ	CERS	Tue, Aug 21, 2018	6.89	7.05	6.89	6.92
5421	NASDAQ	CERS	Mon, Aug 20, 2018	6.88	6.90	6.62	6.89
5420	NASDAQ	CERS	Fri, Aug 17, 2018	6.90	6.95	6.79	6.89
5419	NASDAQ	CERS	Thu, Aug 16, 2018	7.22	7.23	6.87	6.91
5418	NASDAQ	CERS	Wed, Aug 15, 2018	7.25	7.33	7.10	7.16
5417	NASDAQ	CERS	Tue, Aug 14, 2018	7.18	7.39	7.18	7.28
5416	NASDAQ	CERS	Mon, Aug 13, 2018	7.19	7.29	7.10	7.16
5415	NASDAQ	CERS	Fri, Aug 10, 2018	6.86	7.20	6.86	7.16
5414	NASDAQ	CERS	Thu, Aug 9, 2018	6.99	7.06	6.89	6.92
5413	NASDAQ	CERS	Wed, Aug 8, 2018	7.11	7.12	6.87	7.01
5412	NASDAQ	CERS	Tue, Aug 7, 2018	7.13	7.22	7.03	7.11
5411	NASDAQ	CERS	Mon, Aug 6, 2018	7.00	7.36	6.98	7.14
5410	NASDAQ	CERS	Fri, Aug 3, 2018	7.80	8.05	7.00	7.03
5409	NASDAQ	CERS	Thu, Aug 2, 2018	7.46	7.53	7.30	7.41
5408	NASDAQ	CERS	Wed, Aug 1, 2018	7.37	7.53	7.32	7.47
5407	NASDAQ	CERS	Tue, Jul 31, 2018	7.23	7.47	7.21	7.41
5406	NASDAQ	CERS	Mon, Jul 30, 2018	7.33	7.44	7.15	7.18
5405	NASDAQ	CERS	Fri, Jul 27, 2018	7.69	7.72	7.29	7.32
5404	NASDAQ	CERS	Thu, Jul 26, 2018	7.70	7.80	7.59	7.66
5403	NASDAQ	CERS	Wed, Jul 25, 2018	7.54	7.75	7.46	7.69
5402	NASDAQ	CERS	Tue, Jul 24, 2018	7.69	7.73	7.45	7.52
5401	NASDAQ	CERS	Mon, Jul 23, 2018	7.46	7.70	7.35	7.64
5400	NASDAQ	CERS	Fri, Jul 20, 2018	7.59	7.93	7.47	7.52
5399	NASDAQ	CERS	Thu, Jul 19, 2018	7.34	7.46	7.29	7.45
5398	NASDAQ	CERS	Wed, Jul 18, 2018	7.43	7.43	7.26	7.35
5397	NASDAQ	CERS	Tue, Jul 17, 2018	7.29	7.45	7.25	7.41
5396	NASDAQ	CERS	Mon, Jul 16, 2018	7.30	7.37	7.11	7.32
5395	NASDAQ	CERS	Fri, Jul 13, 2018	7.40	7.55	7.26	7.27
5394	NASDAQ	CERS	Thu, Jul 12, 2018	7.09	7.49	7.00	7.42
5393	NASDAQ	CERS	Wed, Jul 11, 2018	6.99	7.08	6.92	6.99
5392	NASDAQ	CERS	Tue, Jul 10, 2018	7.13	7.15	7.01	7.06
5391	NASDAQ	CERS	Mon, Jul 9, 2018	7.03	7.10	6.93	7.05
5390	NASDAQ	CERS	Fri, Jul 6, 2018	7.05	7.15	6.98	7.01
5389	NASDAQ	CERS	Thu, Jul 5, 2018	6.98	7.05	6.84	7.05
5388	NASDAQ	CERS	Tue, Jul 3, 2018	6.96	6.99	6.78	6.91
5387	NASDAQ	CERS	Mon, Jul 2, 2018	6.65	6.91	6.58	6.91
5386	NASDAQ	CERS	Fri, Jun 29, 2018	6.86	6.86	6.61	6.67
5385	NASDAQ	CERS	Thu, Jun 28, 2018	6.56	6.89	6.53	6.80
5384	NASDAQ	CERS	Wed, Jun 27, 2018	6.94	6.99	6.62	6.62
5383	NASDAQ	CERS	Tue, Jun 26, 2018	7.03	7.07	6.91	6.95
5382	NASDAQ	CERS	Mon, Jun 25, 2018	7.07	7.11	6.77	7.00
5381	NASDAQ	CERS	Fri, Jun 22, 2018	7.20	7.22	6.94	7.03
5380	NASDAQ	CERS	Thu, Jun 21, 2018	7.22	7.28	7.07	7.18
5379	NASDAQ	CERS	Wed, Jun 20, 2018	7.12	7.31	7.07	7.25
5378	NASDAQ	CERS	Tue, Jun 19, 2018	6.90	7.08	6.68	7.01
5377	NASDAQ	CERS	Mon, Jun 18, 2018	6.74	7.06	6.70	7.00
5376	NASDAQ	CERS	Fri, Jun 15, 2018	6.69	6.78	6.66	6.77
5375	NASDAQ	CERS	Thu, Jun 14, 2018	6.65	6.75	6.56	6.73
5374	NASDAQ	CERS	Wed, Jun 13, 2018	6.64	6.70	6.59	6.64
5373	NASDAQ	CERS	Tue, Jun 12, 2018	6.63	6.74	6.61	6.65
5372	NASDAQ	CERS	Mon, Jun 11, 2018	6.63	6.65	6.53	6.59
5371	NASDAQ	CERS	Fri, Jun 8, 2018	6.65	6.68	6.57	6.61
5370	NASDAQ	CERS	Thu, Jun 7, 2018	6.76	6.77	6.53	6.62
5369	NASDAQ	CERS	Wed, Jun 6, 2018	6.69	6.85	6.69	6.77
5368	NASDAQ	CERS	Tue, Jun 5, 2018	6.64	6.76	6.61	6.75
5367	NASDAQ	CERS	Mon, Jun 4, 2018	6.65	6.71	6.48	6.63
5366	NASDAQ	CERS	Fri, Jun 1, 2018	6.61	6.71	6.59	6.65
5365	NASDAQ	CERS	Thu, May 31, 2018	6.75	6.99	6.57	6.59
5364	NASDAQ	CERS	Wed, May 30, 2018	6.55	6.79	6.49	6.73
5363	NASDAQ	CERS	Tue, May 29, 2018	6.49	6.59	6.38	6.54
5362	NASDAQ	CERS	Fri, May 25, 2018	6.56	6.64	6.43	6.49
5361	NASDAQ	CERS	Thu, May 24, 2018	6.48	6.74	6.41	6.59
5360	NASDAQ	CERS	Wed, May 23, 2018	6.41	6.60	6.39	6.52
5359	NASDAQ	CERS	Tue, May 22, 2018	6.55	6.59	6.43	6.43
5358	NASDAQ	CERS	Mon, May 21, 2018	6.61	6.70	6.35	6.50
5357	NASDAQ	CERS	Fri, May 18, 2018	6.55	6.72	6.50	6.56
5356	NASDAQ	CERS	Thu, May 17, 2018	6.45	6.57	6.40	6.51
5355	NASDAQ	CERS	Wed, May 16, 2018	6.40	6.46	6.35	6.41
5354	NASDAQ	CERS	Tue, May 15, 2018	6.54	6.57	6.32	6.45
5353	NASDAQ	CERS	Mon, May 14, 2018	6.57	6.79	6.54	6.58
5352	NASDAQ	CERS	Fri, May 11, 2018	6.26	6.70	6.25	6.58
5351	NASDAQ	CERS	Thu, May 10, 2018	6.27	6.75	6.27	6.47
5350	NASDAQ	CERS	Wed, May 9, 2018	5.60	6.47	5.49	6.29
5349	NASDAQ	CERS	Tue, May 8, 2018	5.63	5.63	5.34	5.47
5348	NASDAQ	CERS	Mon, May 7, 2018	5.59	5.66	5.52	5.62
5347	NASDAQ	CERS	Fri, May 4, 2018	5.29	5.59	5.29	5.54
5346	NASDAQ	CERS	Thu, May 3, 2018	5.38	5.40	5.25	5.34
5345	NASDAQ	CERS	Wed, May 2, 2018	5.26	5.45	5.24	5.40
5344	NASDAQ	CERS	Tue, May 1, 2018	5.18	5.31	5.16	5.29
5343	NASDAQ	CERS	Mon, Apr 30, 2018	5.23	5.31	5.17	5.20
5342	NASDAQ	CERS	Fri, Apr 27, 2018	5.35	5.40	5.19	5.23
5341	NASDAQ	CERS	Thu, Apr 26, 2018	5.31	5.42	5.29	5.36
5340	NASDAQ	CERS	Wed, Apr 25, 2018	5.40	5.44	5.28	5.31
5339	NASDAQ	CERS	Tue, Apr 24, 2018	5.47	5.55	5.33	5.38
5338	NASDAQ	CERS	Mon, Apr 23, 2018	5.53	5.58	5.37	5.47
5337	NASDAQ	CERS	Fri, Apr 20, 2018	5.62	5.68	5.47	5.49
5336	NASDAQ	CERS	Thu, Apr 19, 2018	5.64	5.71	5.58	5.66
5335	NASDAQ	CERS	Wed, Apr 18, 2018	5.48	5.77	5.48	5.64
5334	NASDAQ	CERS	Tue, Apr 17, 2018	5.41	5.53	5.34	5.47
5333	NASDAQ	CERS	Mon, Apr 16, 2018	5.44	5.48	5.33	5.35
5332	NASDAQ	CERS	Fri, Apr 13, 2018	5.42	5.46	5.29	5.38
5331	NASDAQ	CERS	Thu, Apr 12, 2018	5.47	5.54	5.40	5.43
5330	NASDAQ	CERS	Wed, Apr 11, 2018	5.27	5.55	5.25	5.45
5329	NASDAQ	CERS	Tue, Apr 10, 2018	5.28	5.35	5.18	5.32
5328	NASDAQ	CERS	Mon, Apr 9, 2018	5.25	5.33	5.13	5.19
5327	NASDAQ	CERS	Fri, Apr 6, 2018	5.25	5.38	5.11	5.20
5326	NASDAQ	CERS	Thu, Apr 5, 2018	5.41	5.48	5.21	5.30
5325	NASDAQ	CERS	Wed, Apr 4, 2018	5.25	5.37	5.23	5.35
5324	NASDAQ	CERS	Tue, Apr 3, 2018	5.30	5.40	5.24	5.31
5323	NASDAQ	CERS	Mon, Apr 2, 2018	5.50	5.53	5.24	5.26
5322	NASDAQ	CERS	Thu, Mar 29, 2018	5.56	5.63	5.45	5.48
5321	NASDAQ	CERS	Wed, Mar 28, 2018	5.35	5.54	5.30	5.52
5320	NASDAQ	CERS	Tue, Mar 27, 2018	5.55	5.64	5.26	5.32
5319	NASDAQ	CERS	Mon, Mar 26, 2018	5.51	5.66	5.43	5.57
5318	NASDAQ	CERS	Fri, Mar 23, 2018	5.51	5.68	5.45	5.49
5317	NASDAQ	CERS	Thu, Mar 22, 2018	5.55	5.71	5.52	5.53
5316	NASDAQ	CERS	Wed, Mar 21, 2018	5.66	5.75	5.54	5.62
5315	NASDAQ	CERS	Tue, Mar 20, 2018	5.50	5.85	5.46	5.64
5314	NASDAQ	CERS	Mon, Mar 19, 2018	5.73	5.74	5.40	5.47
5313	NASDAQ	CERS	Fri, Mar 16, 2018	5.36	5.77	5.32	5.74
5312	NASDAQ	CERS	Thu, Mar 15, 2018	5.41	5.48	5.19	5.24
5311	NASDAQ	CERS	Wed, Mar 14, 2018	5.15	5.43	5.15	5.42
5310	NASDAQ	CERS	Tue, Mar 13, 2018	5.05	5.21	5.02	5.13
5309	NASDAQ	CERS	Mon, Mar 12, 2018	4.80	5.16	4.75	5.05
5308	NASDAQ	CERS	Fri, Mar 9, 2018	4.89	4.91	4.55	4.87
5307	NASDAQ	CERS	Thu, Mar 8, 2018	4.80	4.90	4.68	4.80
5306	NASDAQ	CERS	Wed, Mar 7, 2018	4.63	4.77	4.60	4.77
5305	NASDAQ	CERS	Tue, Mar 6, 2018	4.57	4.87	4.54	4.67
5304	NASDAQ	CERS	Mon, Mar 5, 2018	4.60	4.60	4.44	4.52
5303	NASDAQ	CERS	Fri, Mar 2, 2018	4.28	4.63	4.18	4.60
5302	NASDAQ	CERS	Thu, Mar 1, 2018	4.27	4.35	4.16	4.32
5301	NASDAQ	CERS	Wed, Feb 28, 2018	4.26	4.36	4.25	4.28
5300	NASDAQ	CERS	Tue, Feb 27, 2018	4.28	4.32	4.21	4.25
5299	NASDAQ	CERS	Mon, Feb 26, 2018	4.25	4.32	4.22	4.29
5298	NASDAQ	CERS	Fri, Feb 23, 2018	4.31	4.33	4.15	4.22
5297	NASDAQ	CERS	Thu, Feb 22, 2018	4.21	4.36	4.20	4.27
5296	NASDAQ	CERS	Wed, Feb 21, 2018	4.17	4.32	4.16	4.18
5295	NASDAQ	CERS	Tue, Feb 20, 2018	4.12	4.25	4.05	4.16
5294	NASDAQ	CERS	Fri, Feb 16, 2018	4.10	4.20	4.00	4.13
5293	NASDAQ	CERS	Thu, Feb 15, 2018	4.17	4.21	4.04	4.12
5292	NASDAQ	CERS	Wed, Feb 14, 2018	3.96	4.15	3.95	4.13
5291	NASDAQ	CERS	Tue, Feb 13, 2018	3.84	4.01	3.80	4.00
5290	NASDAQ	CERS	Mon, Feb 12, 2018	3.95	4.01	3.85	3.85
5289	NASDAQ	CERS	Fri, Feb 9, 2018	3.98	4.00	3.77	3.93
5288	NASDAQ	CERS	Thu, Feb 8, 2018	4.07	4.13	3.95	3.95
5287	NASDAQ	CERS	Wed, Feb 7, 2018	3.98	4.11	3.94	4.07
5286	NASDAQ	CERS	Tue, Feb 6, 2018	3.90	4.11	3.89	3.99
5285	NASDAQ	CERS	Mon, Feb 5, 2018	4.31	4.41	3.98	3.99
5284	NASDAQ	CERS	Fri, Feb 2, 2018	4.36	4.48	4.31	4.37
5283	NASDAQ	CERS	Thu, Feb 1, 2018	4.40	4.42	4.31	4.37
5282	NASDAQ	CERS	Wed, Jan 31, 2018	4.48	4.56	4.31	4.43
5281	NASDAQ	CERS	Tue, Jan 30, 2018	4.80	4.83	4.66	4.76
5280	NASDAQ	CERS	Mon, Jan 29, 2018	5.00	5.01	4.67	4.88
5279	NASDAQ	CERS	Fri, Jan 26, 2018	4.93	5.09	4.86	4.99
5278	NASDAQ	CERS	Thu, Jan 25, 2018	4.98	5.11	4.77	4.94
5277	NASDAQ	CERS	Wed, Jan 24, 2018	5.14	5.43	4.84	5.01
5276	NASDAQ	CERS	Tue, Jan 23, 2018	4.18	4.35	4.16	4.33
5275	NASDAQ	CERS	Mon, Jan 22, 2018	4.13	4.22	4.09	4.19
5274	NASDAQ	CERS	Fri, Jan 19, 2018	4.10	4.15	4.07	4.12
5273	NASDAQ	CERS	Thu, Jan 18, 2018	4.16	4.16	4.06	4.11
5272	NASDAQ	CERS	Wed, Jan 17, 2018	4.03	4.18	4.03	4.16
5271	NASDAQ	CERS	Tue, Jan 16, 2018	4.32	4.41	4.00	4.01
5270	NASDAQ	CERS	Fri, Jan 12, 2018	4.41	4.42	4.28	4.32
5269	NASDAQ	CERS	Thu, Jan 11, 2018	4.30	4.48	4.29	4.37
5268	NASDAQ	CERS	Wed, Jan 10, 2018	4.20	4.29	4.18	4.25
5267	NASDAQ	CERS	Tue, Jan 9, 2018	4.18	4.34	4.15	4.23
5266	NASDAQ	CERS	Mon, Jan 8, 2018	4.00	4.40	4.00	4.24
5265	NASDAQ	CERS	Fri, Jan 5, 2018	3.78	3.93	3.76	3.84
5264	NASDAQ	CERS	Thu, Jan 4, 2018	3.59	3.75	3.58	3.72
5263	NASDAQ	CERS	Wed, Jan 3, 2018	3.54	3.60	3.50	3.59
5262	NASDAQ	CERS	Tue, Jan 2, 2018	3.38	3.59	3.38	3.56
5261	NASDAQ	CERS	Fri, Dec 29, 2017	3.49	3.50	3.35	3.38
5260	NASDAQ	CERS	Thu, Dec 28, 2017	3.40	3.50	3.37	3.46
5259	NASDAQ	CERS	Wed, Dec 27, 2017	3.51	3.53	3.37	3.41
5258	NASDAQ	CERS	Tue, Dec 26, 2017	3.66	3.68	3.51	3.51
5257	NASDAQ	CERS	Fri, Dec 22, 2017	3.61	3.66	3.47	3.64
5256	NASDAQ	CERS	Thu, Dec 21, 2017	3.63	3.69	3.63	3.64
5255	NASDAQ	CERS	Wed, Dec 20, 2017	3.60	3.69	3.59	3.64
5254	NASDAQ	CERS	Tue, Dec 19, 2017	3.69	3.75	3.57	3.60
5253	NASDAQ	CERS	Mon, Dec 18, 2017	3.71	3.81	3.69	3.71
5252	NASDAQ	CERS	Fri, Dec 15, 2017	3.71	3.77	3.67	3.69
5251	NASDAQ	CERS	Thu, Dec 14, 2017	3.81	3.83	3.68	3.71
5250	NASDAQ	CERS	Wed, Dec 13, 2017	3.60	3.82	3.59	3.80
5249	NASDAQ	CERS	Tue, Dec 12, 2017	3.65	3.73	3.59	3.62
5248	NASDAQ	CERS	Mon, Dec 11, 2017	3.64	3.76	3.58	3.62
5247	NASDAQ	CERS	Fri, Dec 8, 2017	3.67	3.69	3.61	3.64
5246	NASDAQ	CERS	Thu, Dec 7, 2017	3.59	3.74	3.57	3.65
5245	NASDAQ	CERS	Wed, Dec 6, 2017	3.67	3.72	3.60	3.61
5244	NASDAQ	CERS	Tue, Dec 5, 2017	3.75	3.81	3.65	3.67
5243	NASDAQ	CERS	Mon, Dec 4, 2017	3.93	4.02	3.71	3.73
5242	NASDAQ	CERS	Fri, Dec 1, 2017	3.97	3.98	3.71	3.89
5241	NASDAQ	CERS	Thu, Nov 30, 2017	3.95	3.98	3.90	3.95
5240	NASDAQ	CERS	Wed, Nov 29, 2017	3.94	3.98	3.89	3.91
5239	NASDAQ	CERS	Tue, Nov 28, 2017	3.86	3.95	3.72	3.93
5238	NASDAQ	CERS	Mon, Nov 27, 2017	3.82	3.91	3.77	3.87
5237	NASDAQ	CERS	Fri, Nov 24, 2017	3.76	3.84	3.74	3.81
5236	NASDAQ	CERS	Wed, Nov 22, 2017	3.73	3.82	3.71	3.74
5235	NASDAQ	CERS	Tue, Nov 21, 2017	3.76	3.80	3.69	3.71
5234	NASDAQ	CERS	Mon, Nov 20, 2017	3.75	3.79	3.64	3.75
5233	NASDAQ	CERS	Fri, Nov 17, 2017	3.66	3.76	3.65	3.75
5232	NASDAQ	CERS	Thu, Nov 16, 2017	3.66	3.74	3.63	3.69
5231	NASDAQ	CERS	Wed, Nov 15, 2017	3.49	3.68	3.45	3.63
5230	NASDAQ	CERS	Tue, Nov 14, 2017	3.58	3.65	3.48	3.51
5229	NASDAQ	CERS	Mon, Nov 13, 2017	3.60	3.80	3.52	3.58
5228	NASDAQ	CERS	Fri, Nov 10, 2017	3.57	3.69	3.53	3.60
5227	NASDAQ	CERS	Thu, Nov 9, 2017	3.48	3.62	3.44	3.60
5226	NASDAQ	CERS	Wed, Nov 8, 2017	3.50	3.52	3.39	3.48
5225	NASDAQ	CERS	Tue, Nov 7, 2017	3.49	3.61	3.45	3.49
5224	NASDAQ	CERS	Mon, Nov 6, 2017	3.53	3.67	3.31	3.49
5223	NASDAQ	CERS	Fri, Nov 3, 2017	2.88	3.60	2.88	3.52
5222	NASDAQ	CERS	Thu, Nov 2, 2017	2.78	2.92	2.75	2.88
5221	NASDAQ	CERS	Wed, Nov 1, 2017	2.88	2.94	2.75	2.76
5220	NASDAQ	CERS	Tue, Oct 31, 2017	2.91	2.97	2.85	2.87
5219	NASDAQ	CERS	Mon, Oct 30, 2017	2.92	2.97	2.86	2.90
5218	NASDAQ	CERS	Fri, Oct 27, 2017	2.85	2.96	2.84	2.88
5217	NASDAQ	CERS	Thu, Oct 26, 2017	2.85	2.89	2.82	2.83
5216	NASDAQ	CERS	Wed, Oct 25, 2017	2.87	2.89	2.80	2.87
5215	NASDAQ	CERS	Tue, Oct 24, 2017	2.94	2.94	2.81	2.87
5214	NASDAQ	CERS	Mon, Oct 23, 2017	3.06	3.06	2.94	2.94
5213	NASDAQ	CERS	Fri, Oct 20, 2017	3.04	3.04	2.98	2.99
5212	NASDAQ	CERS	Thu, Oct 19, 2017	3.00	3.02	2.93	3.00
5211	NASDAQ	CERS	Wed, Oct 18, 2017	3.06	3.10	2.99	3.00
5210	NASDAQ	CERS	Tue, Oct 17, 2017	3.10	3.10	3.01	3.04
5209	NASDAQ	CERS	Mon, Oct 16, 2017	3.10	3.14	3.05	3.10
5208	NASDAQ	CERS	Fri, Oct 13, 2017	3.16	3.24	3.11	3.11
5207	NASDAQ	CERS	Thu, Oct 12, 2017	3.01	3.20	3.01	3.17
5206	NASDAQ	CERS	Wed, Oct 11, 2017	2.93	3.10	2.93	3.02
5205	NASDAQ	CERS	Tue, Oct 10, 2017	2.89	2.92	2.83	2.91
5204	NASDAQ	CERS	Mon, Oct 9, 2017	3.03	3.13	2.85	2.86
5203	NASDAQ	CERS	Fri, Oct 6, 2017	3.17	3.17	2.95	3.02
5202	NASDAQ	CERS	Thu, Oct 5, 2017	3.04	3.23	2.94	3.05
5201	NASDAQ	CERS	Wed, Oct 4, 2017	2.89	2.93	2.74	2.82
5200	NASDAQ	CERS	Tue, Oct 3, 2017	2.85	2.92	2.79	2.91
5199	NASDAQ	CERS	Mon, Oct 2, 2017	2.75	2.94	2.74	2.87
5198	NASDAQ	CERS	Fri, Sep 29, 2017	2.74	2.76	2.68	2.73
5197	NASDAQ	CERS	Thu, Sep 28, 2017	2.73	2.76	2.70	2.73
5196	NASDAQ	CERS	Wed, Sep 27, 2017	2.74	2.75	2.66	2.72
5195	NASDAQ	CERS	Tue, Sep 26, 2017	2.67	2.73	2.65	2.71
5194	NASDAQ	CERS	Mon, Sep 25, 2017	2.58	2.69	2.57	2.68
5193	NASDAQ	CERS	Fri, Sep 22, 2017	2.60	2.64	2.54	2.60
5192	NASDAQ	CERS	Thu, Sep 21, 2017	2.52	2.63	2.52	2.61
5191	NASDAQ	CERS	Wed, Sep 20, 2017	2.49	2.57	2.43	2.52
5190	NASDAQ	CERS	Tue, Sep 19, 2017	2.59	2.61	2.45	2.48
5189	NASDAQ	CERS	Mon, Sep 18, 2017	2.62	2.67	2.57	2.58
5188	NASDAQ	CERS	Fri, Sep 15, 2017	2.67	2.71	2.62	2.63
5187	NASDAQ	CERS	Thu, Sep 14, 2017	2.69	2.71	2.64	2.66
5186	NASDAQ	CERS	Wed, Sep 13, 2017	2.69	2.74	2.64	2.71
5185	NASDAQ	CERS	Tue, Sep 12, 2017	2.70	2.77	2.65	2.69
5184	NASDAQ	CERS	Mon, Sep 11, 2017	2.74	2.82	2.66	2.69
5183	NASDAQ	CERS	Fri, Sep 8, 2017	2.69	2.78	2.68	2.68
5182	NASDAQ	CERS	Thu, Sep 7, 2017	2.62	2.72	2.57	2.69
5181	NASDAQ	CERS	Wed, Sep 6, 2017	2.56	2.78	2.44	2.64
5180	NASDAQ	CERS	Tue, Sep 5, 2017	2.52	2.59	2.45	2.53
5179	NASDAQ	CERS	Fri, Sep 1, 2017	2.33	2.57	2.33	2.55
5178	NASDAQ	CERS	Thu, Aug 31, 2017	2.35	2.39	2.30	2.35
5177	NASDAQ	CERS	Wed, Aug 30, 2017	2.39	2.39	2.30	2.31
5176	NASDAQ	CERS	Tue, Aug 29, 2017	2.32	2.40	2.26	2.38
5175	NASDAQ	CERS	Mon, Aug 28, 2017	2.40	2.40	2.31	2.34
5174	NASDAQ	CERS	Fri, Aug 25, 2017	2.46	2.47	2.35	2.38
5173	NASDAQ	CERS	Thu, Aug 24, 2017	2.47	2.49	2.43	2.45
5172	NASDAQ	CERS	Wed, Aug 23, 2017	2.45	2.50	2.43	2.45
5171	NASDAQ	CERS	Tue, Aug 22, 2017	2.49	2.51	2.45	2.48
5170	NASDAQ	CERS	Mon, Aug 21, 2017	2.48	2.51	2.43	2.48
5169	NASDAQ	CERS	Fri, Aug 18, 2017	2.49	2.55	2.41	2.50
5168	NASDAQ	CERS	Thu, Aug 17, 2017	2.55	2.57	2.51	2.52
5167	NASDAQ	CERS	Wed, Aug 16, 2017	2.56	2.60	2.53	2.55
5166	NASDAQ	CERS	Tue, Aug 15, 2017	2.55	2.65	2.53	2.55
5165	NASDAQ	CERS	Mon, Aug 14, 2017	2.51	2.52	2.45	2.49
5164	NASDAQ	CERS	Fri, Aug 11, 2017	2.45	2.51	2.40	2.49
5163	NASDAQ	CERS	Thu, Aug 10, 2017	2.52	2.60	2.41	2.44
5162	NASDAQ	CERS	Wed, Aug 9, 2017	2.55	2.59	2.50	2.54
5161	NASDAQ	CERS	Tue, Aug 8, 2017	2.51	2.64	2.49	2.56
5160	NASDAQ	CERS	Mon, Aug 7, 2017	2.48	2.54	2.40	2.51
5159	NASDAQ	CERS	Fri, Aug 4, 2017	2.15	2.58	2.14	2.48
5158	NASDAQ	CERS	Thu, Aug 3, 2017	2.39	2.47	2.30	2.43
5157	NASDAQ	CERS	Wed, Aug 2, 2017	2.23	2.42	2.20	2.39
5156	NASDAQ	CERS	Tue, Aug 1, 2017	2.30	2.32	2.21	2.22
5155	NASDAQ	CERS	Mon, Jul 31, 2017	2.25	2.27	2.19	2.26
5154	NASDAQ	CERS	Fri, Jul 28, 2017	2.39	2.42	2.23	2.26
5153	NASDAQ	CERS	Thu, Jul 27, 2017	2.18	2.63	2.17	2.40
5152	NASDAQ	CERS	Wed, Jul 26, 2017	2.17	2.20	2.14	2.18
5151	NASDAQ	CERS	Tue, Jul 25, 2017	2.21	2.23	2.15	2.17
5150	NASDAQ	CERS	Mon, Jul 24, 2017	2.16	2.21	2.13	2.19
5149	NASDAQ	CERS	Fri, Jul 21, 2017	2.24	2.24	2.11	2.15
5148	NASDAQ	CERS	Thu, Jul 20, 2017	2.20	2.22	2.10	2.21
5147	NASDAQ	CERS	Wed, Jul 19, 2017	2.26	2.29	2.20	2.21
5146	NASDAQ	CERS	Tue, Jul 18, 2017	2.27	2.30	2.22	2.26
5145	NASDAQ	CERS	Mon, Jul 17, 2017	2.30	2.31	2.22	2.29
5144	NASDAQ	CERS	Fri, Jul 14, 2017	2.26	2.31	2.26	2.30
5143	NASDAQ	CERS	Thu, Jul 13, 2017	2.27	2.30	2.21	2.29
5142	NASDAQ	CERS	Wed, Jul 12, 2017	2.28	2.31	2.23	2.27
5141	NASDAQ	CERS	Tue, Jul 11, 2017	2.26	2.31	2.26	2.27
5140	NASDAQ	CERS	Mon, Jul 10, 2017	2.30	2.30	2.23	2.27
5139	NASDAQ	CERS	Fri, Jul 7, 2017	2.25	2.31	2.21	2.30
5138	NASDAQ	CERS	Thu, Jul 6, 2017	2.29	2.33	2.21	2.21
5137	NASDAQ	CERS	Wed, Jul 5, 2017	2.51	2.55	2.31	2.32
5136	NASDAQ	CERS	Mon, Jul 3, 2017	2.54	2.54	2.47	2.52
5135	NASDAQ	CERS	Fri, Jun 30, 2017	2.49	2.55	2.47	2.51
5134	NASDAQ	CERS	Thu, Jun 29, 2017	2.46	2.58	2.45	2.49
5133	NASDAQ	CERS	Wed, Jun 28, 2017	2.47	2.51	2.41	2.48
5132	NASDAQ	CERS	Tue, Jun 27, 2017	2.56	2.57	2.44	2.45
5131	NASDAQ	CERS	Mon, Jun 26, 2017	2.56	2.59	2.52	2.56
5130	NASDAQ	CERS	Fri, Jun 23, 2017	2.57	2.58	2.51	2.56
5129	NASDAQ	CERS	Thu, Jun 22, 2017	2.37	2.58	2.37	2.56
5128	NASDAQ	CERS	Wed, Jun 21, 2017	2.42	2.44	2.35	2.36
5127	NASDAQ	CERS	Tue, Jun 20, 2017	2.38	2.47	2.37	2.42
5126	NASDAQ	CERS	Mon, Jun 19, 2017	2.21	2.41	2.21	2.37
5125	NASDAQ	CERS	Fri, Jun 16, 2017	2.25	2.28	2.22	2.23
5124	NASDAQ	CERS	Thu, Jun 15, 2017	2.34	2.40	2.26	2.27
5123	NASDAQ	CERS	Wed, Jun 14, 2017	2.40	2.40	2.33	2.34
5122	NASDAQ	CERS	Tue, Jun 13, 2017	2.36	2.41	2.35	2.39
5121	NASDAQ	CERS	Mon, Jun 12, 2017	2.50	2.54	2.34	2.37
5120	NASDAQ	CERS	Fri, Jun 9, 2017	2.60	2.63	2.43	2.49
5119	NASDAQ	CERS	Thu, Jun 8, 2017	2.65	2.74	2.58	2.61
5118	NASDAQ	CERS	Wed, Jun 7, 2017	2.46	2.76	2.43	2.62
5117	NASDAQ	CERS	Tue, Jun 6, 2017	2.30	2.38	2.30	2.35
5116	NASDAQ	CERS	Mon, Jun 5, 2017	2.43	2.46	2.31	2.33
5115	NASDAQ	CERS	Fri, Jun 2, 2017	2.38	2.46	2.38	2.41
5114	NASDAQ	CERS	Thu, Jun 1, 2017	2.30	2.38	2.30	2.36
5113	NASDAQ	CERS	Wed, May 31, 2017	2.29	2.31	2.23	2.29
5112	NASDAQ	CERS	Tue, May 30, 2017	2.37	2.38	2.16	2.29
5111	NASDAQ	CERS	Fri, May 26, 2017	2.05	2.35	1.93	2.35
5110	NASDAQ	CERS	Thu, May 25, 2017	2.27	2.27	2.00	2.02
5109	NASDAQ	CERS	Wed, May 24, 2017	2.32	2.33	2.19	2.26
5108	NASDAQ	CERS	Tue, May 23, 2017	2.81	2.83	2.19	2.25
5107	NASDAQ	CERS	Mon, May 22, 2017	3.00	3.04	2.95	3.00
5106	NASDAQ	CERS	Fri, May 19, 2017	3.10	3.13	3.00	3.00
5105	NASDAQ	CERS	Thu, May 18, 2017	3.07	3.10	3.00	3.10
5104	NASDAQ	CERS	Wed, May 17, 2017	3.11	3.16	3.00	3.07
5103	NASDAQ	CERS	Tue, May 16, 2017	3.17	3.21	3.07	3.17
5102	NASDAQ	CERS	Mon, May 15, 2017	3.11	3.23	3.08	3.18
5101	NASDAQ	CERS	Fri, May 12, 2017	3.13	3.15	3.07	3.12
5100	NASDAQ	CERS	Thu, May 11, 2017	3.19	3.24	3.12	3.13
5099	NASDAQ	CERS	Wed, May 10, 2017	3.20	3.31	3.16	3.19
5098	NASDAQ	CERS	Tue, May 9, 2017	3.24	3.29	3.09	3.22
5097	NASDAQ	CERS	Mon, May 8, 2017	3.35	3.39	3.11	3.11
5096	NASDAQ	CERS	Fri, May 5, 2017	3.50	3.51	3.20	3.33
5095	NASDAQ	CERS	Thu, May 4, 2017	4.00	4.00	2.83	3.49
5094	NASDAQ	CERS	Wed, May 3, 2017	4.34	4.36	4.20	4.24
5093	NASDAQ	CERS	Tue, May 2, 2017	4.36	4.39	4.30	4.34
5092	NASDAQ	CERS	Mon, May 1, 2017	4.35	4.42	4.33	4.37
5091	NASDAQ	CERS	Fri, Apr 28, 2017	4.44	4.49	4.29	4.35
5090	NASDAQ	CERS	Thu, Apr 27, 2017	4.62	4.69	4.40	4.41
5089	NASDAQ	CERS	Wed, Apr 26, 2017	4.28	4.70	4.28	4.61
5088	NASDAQ	CERS	Tue, Apr 25, 2017	4.26	4.38	4.26	4.28
5087	NASDAQ	CERS	Mon, Apr 24, 2017	4.19	4.25	4.13	4.24
5086	NASDAQ	CERS	Fri, Apr 21, 2017	4.22	4.26	4.10	4.12
5085	NASDAQ	CERS	Thu, Apr 20, 2017	4.23	4.30	4.12	4.23
5084	NASDAQ	CERS	Wed, Apr 19, 2017	4.19	4.29	4.16	4.20
5083	NASDAQ	CERS	Tue, Apr 18, 2017	4.12	4.24	4.05	4.16
5082	NASDAQ	CERS	Mon, Apr 17, 2017	4.08	4.25	4.08	4.18
5081	NASDAQ	CERS	Thu, Apr 13, 2017	4.07	4.20	4.07	4.11
5080	NASDAQ	CERS	Wed, Apr 12, 2017	4.14	4.19	4.08	4.10
5079	NASDAQ	CERS	Tue, Apr 11, 2017	4.21	4.23	4.08	4.17
5078	NASDAQ	CERS	Mon, Apr 10, 2017	4.30	4.34	4.18	4.21
5077	NASDAQ	CERS	Fri, Apr 7, 2017	4.25	4.34	4.17	4.30
5076	NASDAQ	CERS	Thu, Apr 6, 2017	4.10	4.27	4.03	4.27
5075	NASDAQ	CERS	Wed, Apr 5, 2017	4.21	4.24	4.06	4.10
5074	NASDAQ	CERS	Tue, Apr 4, 2017	4.39	4.41	4.10	4.19
5073	NASDAQ	CERS	Mon, Apr 3, 2017	4.45	4.55	4.38	4.39
5072	NASDAQ	CERS	Fri, Mar 31, 2017	4.45	4.50	4.37	4.45
5071	NASDAQ	CERS	Thu, Mar 30, 2017	4.38	4.49	4.34	4.44
5070	NASDAQ	CERS	Wed, Mar 29, 2017	4.35	4.56	4.33	4.38
5069	NASDAQ	CERS	Tue, Mar 28, 2017	4.25	4.39	4.22	4.35
5068	NASDAQ	CERS	Mon, Mar 27, 2017	4.04	4.28	4.04	4.22
5067	NASDAQ	CERS	Fri, Mar 24, 2017	4.13	4.20	4.05	4.10
5066	NASDAQ	CERS	Thu, Mar 23, 2017	4.06	4.15	4.00	4.12
5065	NASDAQ	CERS	Wed, Mar 22, 2017	4.13	4.17	4.00	4.06
5064	NASDAQ	CERS	Tue, Mar 21, 2017	4.25	4.27	4.11	4.13
5063	NASDAQ	CERS	Mon, Mar 20, 2017	4.22	4.32	4.17	4.22
5062	NASDAQ	CERS	Fri, Mar 17, 2017	4.23	4.29	4.14	4.21
5061	NASDAQ	CERS	Thu, Mar 16, 2017	4.38	4.39	4.23	4.25
5060	NASDAQ	CERS	Wed, Mar 15, 2017	4.21	4.44	4.18	4.36
5059	NASDAQ	CERS	Tue, Mar 14, 2017	4.15	4.28	4.09	4.25
5058	NASDAQ	CERS	Mon, Mar 13, 2017	4.43	4.45	4.22	4.25
5057	NASDAQ	CERS	Fri, Mar 10, 2017	4.14	4.56	4.14	4.45
5056	NASDAQ	CERS	Thu, Mar 9, 2017	3.91	4.14	3.79	4.14
5055	NASDAQ	CERS	Wed, Mar 8, 2017	4.05	4.14	3.80	3.91
5054	NASDAQ	CERS	Tue, Mar 7, 2017	4.20	4.24	4.14	4.15
5053	NASDAQ	CERS	Mon, Mar 6, 2017	4.44	4.45	4.23	4.24
5052	NASDAQ	CERS	Fri, Mar 3, 2017	4.40	4.49	4.32	4.46
5051	NASDAQ	CERS	Thu, Mar 2, 2017	4.29	4.55	4.29	4.41
5050	NASDAQ	CERS	Wed, Mar 1, 2017	4.27	4.34	4.23	4.33
5049	NASDAQ	CERS	Tue, Feb 28, 2017	4.27	4.35	4.17	4.19
5048	NASDAQ	CERS	Mon, Feb 27, 2017	4.23	4.30	4.19	4.27
5047	NASDAQ	CERS	Fri, Feb 24, 2017	4.24	4.29	4.08	4.27
5046	NASDAQ	CERS	Thu, Feb 23, 2017	4.04	4.31	4.02	4.28
5045	NASDAQ	CERS	Wed, Feb 22, 2017	4.14	4.15	4.03	4.05
5044	NASDAQ	CERS	Tue, Feb 21, 2017	4.30	4.31	4.12	4.14
5043	NASDAQ	CERS	Fri, Feb 17, 2017	4.17	4.41	4.12	4.29
5042	NASDAQ	CERS	Thu, Feb 16, 2017	4.06	4.20	3.97	4.16
5041	NASDAQ	CERS	Wed, Feb 15, 2017	4.06	4.16	4.04	4.08
5040	NASDAQ	CERS	Tue, Feb 14, 2017	4.04	4.14	4.04	4.09
5039	NASDAQ	CERS	Mon, Feb 13, 2017	4.14	4.18	4.05	4.10
5038	NASDAQ	CERS	Fri, Feb 10, 2017	4.14	4.20	4.11	4.13
5037	NASDAQ	CERS	Thu, Feb 9, 2017	4.09	4.18	4.05	4.14
5036	NASDAQ	CERS	Wed, Feb 8, 2017	4.08	4.11	3.97	4.10
5035	NASDAQ	CERS	Tue, Feb 7, 2017	4.07	4.12	4.00	4.09
5034	NASDAQ	CERS	Mon, Feb 6, 2017	4.15	4.18	4.04	4.07
5033	NASDAQ	CERS	Fri, Feb 3, 2017	4.17	4.19	4.05	4.18
5032	NASDAQ	CERS	Thu, Feb 2, 2017	4.11	4.20	4.04	4.15
5031	NASDAQ	CERS	Wed, Feb 1, 2017	4.28	4.32	4.10	4.14
5030	NASDAQ	CERS	Tue, Jan 31, 2017	4.12	4.33	4.03	4.26
5029	NASDAQ	CERS	Mon, Jan 30, 2017	4.24	4.24	4.07	4.12
5028	NASDAQ	CERS	Fri, Jan 27, 2017	4.05	4.28	4.02	4.26
5027	NASDAQ	CERS	Thu, Jan 26, 2017	4.19	4.26	4.01	4.04
5026	NASDAQ	CERS	Wed, Jan 25, 2017	4.24	4.32	4.19	4.19
5025	NASDAQ	CERS	Tue, Jan 24, 2017	4.19	4.22	4.07	4.21
5024	NASDAQ	CERS	Mon, Jan 23, 2017	4.38	4.41	4.08	4.20
5023	NASDAQ	CERS	Fri, Jan 20, 2017	4.29	4.45	4.22	4.39
5022	NASDAQ	CERS	Thu, Jan 19, 2017	4.15	4.32	4.12	4.31
5021	NASDAQ	CERS	Wed, Jan 18, 2017	4.20	4.22	4.07	4.15
5020	NASDAQ	CERS	Tue, Jan 17, 2017	4.27	4.27	4.13	4.19
5019	NASDAQ	CERS	Fri, Jan 13, 2017	4.26	4.39	4.23	4.29
5018	NASDAQ	CERS	Thu, Jan 12, 2017	4.22	4.32	4.11	4.25
5017	NASDAQ	CERS	Wed, Jan 11, 2017	4.50	4.50	4.18	4.26
5016	NASDAQ	CERS	Tue, Jan 10, 2017	4.48	4.52	4.35	4.50
5015	NASDAQ	CERS	Mon, Jan 9, 2017	4.45	4.55	4.37	4.48
5014	NASDAQ	CERS	Fri, Jan 6, 2017	4.53	4.55	4.37	4.40
5013	NASDAQ	CERS	Thu, Jan 5, 2017	4.60	4.69	4.42	4.52
5012	NASDAQ	CERS	Wed, Jan 4, 2017	4.34	4.65	4.31	4.58
5011	NASDAQ	CERS	Tue, Jan 3, 2017	4.35	4.39	4.25	4.33
5010	NASDAQ	CERS	Fri, Dec 30, 2016	4.30	4.38	4.26	4.35
5009	NASDAQ	CERS	Thu, Dec 29, 2016	4.27	4.44	4.27	4.35
5008	NASDAQ	CERS	Wed, Dec 28, 2016	4.36	4.38	4.17	4.27
5007	NASDAQ	CERS	Tue, Dec 27, 2016	4.66	4.70	4.37	4.38
5006	NASDAQ	CERS	Fri, Dec 23, 2016	4.43	4.66	4.40	4.66
5005	NASDAQ	CERS	Thu, Dec 22, 2016	4.36	4.51	4.34	4.40
5004	NASDAQ	CERS	Wed, Dec 21, 2016	4.56	4.64	4.34	4.37
5003	NASDAQ	CERS	Tue, Dec 20, 2016	4.85	4.88	4.44	4.55
5002	NASDAQ	CERS	Mon, Dec 19, 2016	4.92	5.01	4.79	4.84
5001	NASDAQ	CERS	Fri, Dec 16, 2016	4.91	5.16	4.89	4.91
5000	NASDAQ	CERS	Thu, Dec 15, 2016	4.96	5.00	4.83	4.89
4999	NASDAQ	CERS	Wed, Dec 14, 2016	5.16	5.21	4.90	4.92
4998	NASDAQ	CERS	Tue, Dec 13, 2016	5.11	5.26	5.00	5.17
4997	NASDAQ	CERS	Mon, Dec 12, 2016	5.10	5.20	5.02	5.07
4996	NASDAQ	CERS	Fri, Dec 9, 2016	5.18	5.36	5.13	5.16
4995	NASDAQ	CERS	Thu, Dec 8, 2016	4.97	5.16	4.87	5.15
4994	NASDAQ	CERS	Wed, Dec 7, 2016	5.03	5.16	4.90	4.97
4993	NASDAQ	CERS	Tue, Dec 6, 2016	5.06	5.12	4.93	5.08
4992	NASDAQ	CERS	Mon, Dec 5, 2016	5.02	5.11	4.94	5.01
4991	NASDAQ	CERS	Fri, Dec 2, 2016	4.94	5.14	4.88	4.98
4990	NASDAQ	CERS	Thu, Dec 1, 2016	5.25	5.31	4.89	4.93
4989	NASDAQ	CERS	Wed, Nov 30, 2016	5.48	5.51	5.18	5.22
4988	NASDAQ	CERS	Tue, Nov 29, 2016	5.48	5.58	5.41	5.45
4987	NASDAQ	CERS	Mon, Nov 28, 2016	5.69	5.69	5.46	5.47
4986	NASDAQ	CERS	Fri, Nov 25, 2016	5.70	5.75	5.63	5.73
4985	NASDAQ	CERS	Wed, Nov 23, 2016	5.65	5.75	5.55	5.65
4984	NASDAQ	CERS	Tue, Nov 22, 2016	5.70	5.80	5.60	5.67
4983	NASDAQ	CERS	Mon, Nov 21, 2016	5.86	5.91	5.68	5.70
4982	NASDAQ	CERS	Fri, Nov 18, 2016	5.75	5.89	5.71	5.86
4981	NASDAQ	CERS	Thu, Nov 17, 2016	5.65	5.78	5.65	5.76
4980	NASDAQ	CERS	Wed, Nov 16, 2016	5.67	5.75	5.55	5.65
4979	NASDAQ	CERS	Tue, Nov 15, 2016	5.74	5.79	5.66	5.70
4978	NASDAQ	CERS	Mon, Nov 14, 2016	5.80	5.83	5.72	5.76
4977	NASDAQ	CERS	Fri, Nov 11, 2016	5.62	5.81	5.55	5.76
4976	NASDAQ	CERS	Thu, Nov 10, 2016	5.64	5.84	5.58	5.68
4975	NASDAQ	CERS	Wed, Nov 9, 2016	5.37	5.61	5.35	5.54
4974	NASDAQ	CERS	Tue, Nov 8, 2016	4.99	5.26	4.89	5.20
4973	NASDAQ	CERS	Mon, Nov 7, 2016	4.94	5.06	4.79	5.02
4972	NASDAQ	CERS	Fri, Nov 4, 2016	4.35	5.30	4.30	4.81
4971	NASDAQ	CERS	Thu, Nov 3, 2016	4.55	4.60	4.22	4.22
4970	NASDAQ	CERS	Wed, Nov 2, 2016	4.67	4.68	4.51	4.52
4969	NASDAQ	CERS	Tue, Nov 1, 2016	4.82	4.86	4.56	4.65
4968	NASDAQ	CERS	Mon, Oct 31, 2016	4.90	4.93	4.80	4.82
4967	NASDAQ	CERS	Fri, Oct 28, 2016	4.75	4.95	4.75	4.91
4966	NASDAQ	CERS	Thu, Oct 27, 2016	5.06	5.11	4.79	4.81
4965	NASDAQ	CERS	Wed, Oct 26, 2016	5.22	5.22	5.01	5.01
4964	NASDAQ	CERS	Tue, Oct 25, 2016	5.12	5.24	5.08	5.22
4963	NASDAQ	CERS	Mon, Oct 24, 2016	5.24	5.28	5.08	5.11
4962	NASDAQ	CERS	Fri, Oct 21, 2016	5.25	5.30	5.14	5.15
4961	NASDAQ	CERS	Thu, Oct 20, 2016	5.20	5.34	5.20	5.30
4960	NASDAQ	CERS	Wed, Oct 19, 2016	5.28	5.28	5.15	5.25
4959	NASDAQ	CERS	Tue, Oct 18, 2016	5.21	5.32	5.16	5.26
4958	NASDAQ	CERS	Mon, Oct 17, 2016	5.13	5.19	5.08	5.15
4957	NASDAQ	CERS	Fri, Oct 14, 2016	5.23	5.28	5.01	5.17
4956	NASDAQ	CERS	Thu, Oct 13, 2016	5.49	5.51	5.15	5.18
4955	NASDAQ	CERS	Wed, Oct 12, 2016	5.71	5.75	5.50	5.52
4954	NASDAQ	CERS	Tue, Oct 11, 2016	6.05	6.07	5.66	5.74
4953	NASDAQ	CERS	Mon, Oct 10, 2016	5.96	6.16	5.90	6.10
4952	NASDAQ	CERS	Fri, Oct 7, 2016	6.00	6.05	5.82	5.90
4951	NASDAQ	CERS	Thu, Oct 6, 2016	6.23	6.23	5.97	6.00
4950	NASDAQ	CERS	Wed, Oct 5, 2016	6.19	6.30	6.17	6.26
4949	NASDAQ	CERS	Tue, Oct 4, 2016	6.25	6.27	6.14	6.20
4948	NASDAQ	CERS	Mon, Oct 3, 2016	6.21	6.34	6.12	6.26
4947	NASDAQ	CERS	Fri, Sep 30, 2016	6.13	6.25	6.01	6.21
4946	NASDAQ	CERS	Thu, Sep 29, 2016	6.52	6.59	6.10	6.12
4945	NASDAQ	CERS	Wed, Sep 28, 2016	6.43	6.56	6.39	6.53
4944	NASDAQ	CERS	Tue, Sep 27, 2016	6.42	6.45	6.24	6.39
4943	NASDAQ	CERS	Mon, Sep 26, 2016	6.18	6.33	6.13	6.30
4942	NASDAQ	CERS	Fri, Sep 23, 2016	6.19	6.28	6.13	6.23
4941	NASDAQ	CERS	Thu, Sep 22, 2016	6.07	6.30	5.95	6.25
4940	NASDAQ	CERS	Wed, Sep 21, 2016	5.96	6.06	5.86	6.06
4939	NASDAQ	CERS	Tue, Sep 20, 2016	6.04	6.08	5.83	5.96
4938	NASDAQ	CERS	Mon, Sep 19, 2016	6.12	6.13	5.79	6.00
4937	NASDAQ	CERS	Fri, Sep 16, 2016	6.14	6.29	6.06	6.13
4936	NASDAQ	CERS	Thu, Sep 15, 2016	6.07	6.18	5.98	6.13
4935	NASDAQ	CERS	Wed, Sep 14, 2016	6.04	6.15	5.91	6.08
4934	NASDAQ	CERS	Tue, Sep 13, 2016	6.14	6.23	5.98	6.05
4933	NASDAQ	CERS	Mon, Sep 12, 2016	6.01	6.19	6.00	6.18
4932	NASDAQ	CERS	Fri, Sep 9, 2016	6.42	6.59	6.07	6.07
4931	NASDAQ	CERS	Thu, Sep 8, 2016	6.50	6.58	6.40	6.48
4930	NASDAQ	CERS	Wed, Sep 7, 2016	6.36	6.61	6.35	6.47
4929	NASDAQ	CERS	Tue, Sep 6, 2016	6.32	6.44	6.22	6.35
4928	NASDAQ	CERS	Fri, Sep 2, 2016	6.36	6.46	6.31	6.36
4927	NASDAQ	CERS	Thu, Sep 1, 2016	6.31	6.44	6.30	6.36
4926	NASDAQ	CERS	Wed, Aug 31, 2016	6.59	6.65	6.28	6.33
4925	NASDAQ	CERS	Tue, Aug 30, 2016	6.89	6.96	6.59	6.63
4924	NASDAQ	CERS	Mon, Aug 29, 2016	7.00	7.19	6.83	6.90
4923	NASDAQ	CERS	Fri, Aug 26, 2016	6.56	6.85	6.47	6.75
4922	NASDAQ	CERS	Thu, Aug 25, 2016	6.64	6.75	6.48	6.60
4921	NASDAQ	CERS	Wed, Aug 24, 2016	6.77	6.90	6.56	6.59
4920	NASDAQ	CERS	Tue, Aug 23, 2016	6.89	6.98	6.77	6.78
4919	NASDAQ	CERS	Mon, Aug 22, 2016	6.84	6.91	6.72	6.89
4918	NASDAQ	CERS	Fri, Aug 19, 2016	6.66	6.81	6.57	6.76
4917	NASDAQ	CERS	Thu, Aug 18, 2016	6.80	6.86	6.69	6.70
4916	NASDAQ	CERS	Wed, Aug 17, 2016	6.82	6.93	6.75	6.80
4915	NASDAQ	CERS	Tue, Aug 16, 2016	7.00	7.03	6.80	6.84
4914	NASDAQ	CERS	Mon, Aug 15, 2016	7.04	7.11	6.97	6.99
4913	NASDAQ	CERS	Fri, Aug 12, 2016	6.89	7.01	6.85	6.99
4912	NASDAQ	CERS	Thu, Aug 11, 2016	6.94	7.05	6.86	6.93
4911	NASDAQ	CERS	Wed, Aug 10, 2016	6.87	6.97	6.75	6.89
4910	NASDAQ	CERS	Tue, Aug 9, 2016	6.91	7.07	6.83	6.85
4909	NASDAQ	CERS	Mon, Aug 8, 2016	7.40	7.48	6.82	6.88
4908	NASDAQ	CERS	Fri, Aug 5, 2016	6.98	7.35	6.71	7.30
4907	NASDAQ	CERS	Thu, Aug 4, 2016	7.23	7.28	7.11	7.19
4906	NASDAQ	CERS	Wed, Aug 3, 2016	7.15	7.29	7.03	7.17
4905	NASDAQ	CERS	Tue, Aug 2, 2016	7.40	7.41	7.06	7.19
4904	NASDAQ	CERS	Mon, Aug 1, 2016	7.54	7.64	7.28	7.31
4903	NASDAQ	CERS	Fri, Jul 29, 2016	7.00	7.50	6.93	7.39
4902	NASDAQ	CERS	Thu, Jul 28, 2016	6.72	7.01	6.72	6.97
4901	NASDAQ	CERS	Wed, Jul 27, 2016	6.61	6.72	6.58	6.70
4900	NASDAQ	CERS	Tue, Jul 26, 2016	6.68	6.75	6.61	6.63
4899	NASDAQ	CERS	Mon, Jul 25, 2016	6.83	6.83	6.60	6.65
4898	NASDAQ	CERS	Fri, Jul 22, 2016	6.53	6.61	6.48	6.57
4897	NASDAQ	CERS	Thu, Jul 21, 2016	6.60	6.75	6.45	6.50
4896	NASDAQ	CERS	Wed, Jul 20, 2016	6.48	6.60	6.32	6.58
4895	NASDAQ	CERS	Tue, Jul 19, 2016	6.21	6.88	6.14	6.30
4894	NASDAQ	CERS	Mon, Jul 18, 2016	6.25	6.30	6.13	6.24
4893	NASDAQ	CERS	Fri, Jul 15, 2016	6.23	6.26	6.12	6.25
4892	NASDAQ	CERS	Thu, Jul 14, 2016	6.32	6.32	6.14	6.19
4891	NASDAQ	CERS	Wed, Jul 13, 2016	6.54	6.56	6.26	6.26
4890	NASDAQ	CERS	Tue, Jul 12, 2016	6.52	6.64	6.42	6.50
4889	NASDAQ	CERS	Mon, Jul 11, 2016	6.46	6.56	6.42	6.46
4888	NASDAQ	CERS	Fri, Jul 8, 2016	6.39	6.52	6.39	6.45
4887	NASDAQ	CERS	Thu, Jul 7, 2016	6.45	6.50	6.23	6.36
4886	NASDAQ	CERS	Wed, Jul 6, 2016	6.26	6.47	6.26	6.40
4885	NASDAQ	CERS	Tue, Jul 5, 2016	6.27	6.37	6.23	6.27
4884	NASDAQ	CERS	Fri, Jul 1, 2016	6.22	6.30	6.17	6.27
4883	NASDAQ	CERS	Thu, Jun 30, 2016	6.27	6.30	6.11	6.24
4882	NASDAQ	CERS	Wed, Jun 29, 2016	6.03	6.33	5.98	6.25
4881	NASDAQ	CERS	Tue, Jun 28, 2016	5.91	6.02	5.90	5.99
4880	NASDAQ	CERS	Mon, Jun 27, 2016	5.95	6.00	5.76	5.87
4879	NASDAQ	CERS	Fri, Jun 24, 2016	6.00	6.15	5.93	6.03
4878	NASDAQ	CERS	Thu, Jun 23, 2016	6.10	6.29	6.04	6.29
4877	NASDAQ	CERS	Wed, Jun 22, 2016	6.03	6.23	5.99	6.09
4876	NASDAQ	CERS	Tue, Jun 21, 2016	6.15	6.20	5.90	6.04
4875	NASDAQ	CERS	Mon, Jun 20, 2016	6.37	6.37	6.05	6.14
4874	NASDAQ	CERS	Fri, Jun 17, 2016	5.90	5.90	5.67	5.70
4873	NASDAQ	CERS	Thu, Jun 16, 2016	5.88	5.93	5.73	5.90
4872	NASDAQ	CERS	Wed, Jun 15, 2016	5.96	6.03	5.88	5.90
4871	NASDAQ	CERS	Tue, Jun 14, 2016	6.07	6.13	5.92	5.96
4870	NASDAQ	CERS	Mon, Jun 13, 2016	6.03	6.18	5.96	6.09
4869	NASDAQ	CERS	Fri, Jun 10, 2016	5.89	6.17	5.78	6.09
4868	NASDAQ	CERS	Thu, Jun 9, 2016	6.05	6.08	5.94	5.97
4867	NASDAQ	CERS	Wed, Jun 8, 2016	6.03	6.13	5.99	6.08
4866	NASDAQ	CERS	Tue, Jun 7, 2016	5.75	6.16	5.74	6.03
4865	NASDAQ	CERS	Mon, Jun 6, 2016	5.54	5.78	5.47	5.74
4864	NASDAQ	CERS	Fri, Jun 3, 2016	5.68	5.70	5.50	5.52
4863	NASDAQ	CERS	Thu, Jun 2, 2016	5.66	5.76	5.64	5.69
4862	NASDAQ	CERS	Wed, Jun 1, 2016	5.54	5.70	5.53	5.66
4861	NASDAQ	CERS	Tue, May 31, 2016	5.51	5.61	5.49	5.56
4860	NASDAQ	CERS	Fri, May 27, 2016	5.55	5.62	5.44	5.51
4859	NASDAQ	CERS	Thu, May 26, 2016	5.62	5.67	5.54	5.55
4858	NASDAQ	CERS	Wed, May 25, 2016	5.54	5.75	5.52	5.63
4857	NASDAQ	CERS	Tue, May 24, 2016	5.40	5.56	5.33	5.53
4856	NASDAQ	CERS	Mon, May 23, 2016	5.50	5.62	5.33	5.40
4855	NASDAQ	CERS	Fri, May 20, 2016	5.10	5.20	4.90	5.20
4854	NASDAQ	CERS	Thu, May 19, 2016	5.18	5.26	5.07	5.07
4853	NASDAQ	CERS	Wed, May 18, 2016	5.17	5.28	5.14	5.20
4852	NASDAQ	CERS	Tue, May 17, 2016	5.42	5.42	5.13	5.18
4851	NASDAQ	CERS	Mon, May 16, 2016	5.29	5.46	5.27	5.43
4850	NASDAQ	CERS	Fri, May 13, 2016	5.22	5.45	5.21	5.31
4849	NASDAQ	CERS	Thu, May 12, 2016	5.44	5.52	5.11	5.22
4848	NASDAQ	CERS	Wed, May 11, 2016	5.61	5.72	5.44	5.44
4847	NASDAQ	CERS	Tue, May 10, 2016	5.72	5.80	5.58	5.64
4846	NASDAQ	CERS	Mon, May 9, 2016	5.45	5.83	5.45	5.73
4845	NASDAQ	CERS	Fri, May 6, 2016	5.58	5.63	5.50	5.51
4844	NASDAQ	CERS	Thu, May 5, 2016	5.89	5.89	5.55	5.63
4843	NASDAQ	CERS	Wed, May 4, 2016	5.86	5.91	5.42	5.83
4842	NASDAQ	CERS	Tue, May 3, 2016	6.22	6.31	6.11	6.17
4841	NASDAQ	CERS	Mon, May 2, 2016	6.26	6.29	6.11	6.24
4840	NASDAQ	CERS	Fri, Apr 29, 2016	6.43	6.47	6.16	6.26
4839	NASDAQ	CERS	Thu, Apr 28, 2016	6.41	6.61	6.40	6.42
4838	NASDAQ	CERS	Wed, Apr 27, 2016	6.42	6.58	6.32	6.47
4837	NASDAQ	CERS	Tue, Apr 26, 2016	6.52	6.54	6.26	6.45
4836	NASDAQ	CERS	Mon, Apr 25, 2016	6.69	6.70	6.44	6.48
4835	NASDAQ	CERS	Fri, Apr 22, 2016	6.75	6.89	6.56	6.65
4834	NASDAQ	CERS	Thu, Apr 21, 2016	6.52	6.71	6.50	6.65
4833	NASDAQ	CERS	Wed, Apr 20, 2016	6.32	6.58	6.28	6.52
4832	NASDAQ	CERS	Tue, Apr 19, 2016	6.43	6.50	6.32	6.35
4831	NASDAQ	CERS	Mon, Apr 18, 2016	6.63	6.67	6.35	6.43
4830	NASDAQ	CERS	Fri, Apr 15, 2016	6.47	6.68	6.39	6.60
4829	NASDAQ	CERS	Thu, Apr 14, 2016	6.25	6.49	6.17	6.46
4828	NASDAQ	CERS	Wed, Apr 13, 2016	6.36	6.36	6.17	6.22
4827	NASDAQ	CERS	Tue, Apr 12, 2016	6.13	6.31	6.00	6.30
4826	NASDAQ	CERS	Mon, Apr 11, 2016	6.22	6.30	6.05	6.10
4825	NASDAQ	CERS	Fri, Apr 8, 2016	6.40	6.48	6.06	6.15
4824	NASDAQ	CERS	Thu, Apr 7, 2016	6.39	6.49	6.32	6.38
4823	NASDAQ	CERS	Wed, Apr 6, 2016	6.19	6.40	6.09	6.40
4822	NASDAQ	CERS	Tue, Apr 5, 2016	6.15	6.15	6.15	6.16
4821	NASDAQ	CERS	Mon, Apr 4, 2016	5.99	6.25	5.93	6.15
4820	NASDAQ	CERS	Fri, Apr 1, 2016	5.91	6.03	5.86	6.00
4819	NASDAQ	CERS	Thu, Mar 31, 2016	5.91	5.98	5.85	5.88
4818	NASDAQ	CERS	Wed, Mar 30, 2016	5.99	6.05	5.69	5.88
4817	NASDAQ	CERS	Tue, Mar 29, 2016	5.79	5.80	5.79	5.79
4816	NASDAQ	CERS	Mon, Mar 28, 2016	5.77	5.82	5.68	5.82
4815	NASDAQ	CERS	Thu, Mar 24, 2016	5.80	5.80	5.80	5.78
4814	NASDAQ	CERS	Wed, Mar 23, 2016	6.01	6.13	5.79	5.80
4813	NASDAQ	CERS	Tue, Mar 22, 2016	6.02	6.10	6.01	6.01
4812	NASDAQ	CERS	Mon, Mar 21, 2016	6.02	6.11	5.97	5.99
4811	NASDAQ	CERS	Fri, Mar 18, 2016	5.82	5.99	5.69	5.95
4810	NASDAQ	CERS	Thu, Mar 17, 2016	5.82	5.88	5.50	5.78
4809	NASDAQ	CERS	Wed, Mar 16, 2016	6.10	6.17	5.61	5.79
4808	NASDAQ	CERS	Tue, Mar 15, 2016	5.70	5.70	5.70	5.99
4807	NASDAQ	CERS	Mon, Mar 14, 2016	5.62	5.89	5.62	5.70
4806	NASDAQ	CERS	Fri, Mar 11, 2016	5.58	5.67	5.42	5.65
4805	NASDAQ	CERS	Thu, Mar 10, 2016	5.69	5.82	5.44	5.66
4804	NASDAQ	CERS	Wed, Mar 9, 2016	5.32	5.32	5.05	5.66
4803	NASDAQ	CERS	Tue, Mar 8, 2016	5.59	5.61	5.30	5.63
4802	NASDAQ	CERS	Mon, Mar 7, 2016	5.69	5.81	5.57	5.63
4801	NASDAQ	CERS	Fri, Mar 4, 2016	5.65	5.65	5.65	5.72
4800	NASDAQ	CERS	Thu, Mar 3, 2016	5.30	5.30	5.30	5.65
4799	NASDAQ	CERS	Wed, Mar 2, 2016	5.04	5.30	5.04	5.26
4798	NASDAQ	CERS	Tue, Mar 1, 2016	4.90	4.90	4.90	5.06
4797	NASDAQ	CERS	Mon, Feb 29, 2016	5.07	5.15	4.87	4.90
4796	NASDAQ	CERS	Fri, Feb 26, 2016	4.98	4.98	4.98	5.08
4795	NASDAQ	CERS	Thu, Feb 25, 2016	5.09	5.20	4.86	4.98
4794	NASDAQ	CERS	Wed, Feb 24, 2016	5.04	5.14	4.81	5.10
4793	NASDAQ	CERS	Tue, Feb 23, 2016	5.03	5.12	4.96	5.07
4792	NASDAQ	CERS	Mon, Feb 22, 2016	5.40	5.45	5.07	5.09
4791	NASDAQ	CERS	Fri, Feb 19, 2016	5.32	5.40	5.21	5.36
4790	NASDAQ	CERS	Thu, Feb 18, 2016	5.33	5.41	5.18	5.33
4789	NASDAQ	CERS	Wed, Feb 17, 2016	5.25	5.33	4.98	5.29
4788	NASDAQ	CERS	Tue, Feb 16, 2016	5.15	5.22	4.85	5.00
4787	NASDAQ	CERS	Fri, Feb 12, 2016	5.25	5.37	4.98	5.11
4786	NASDAQ	CERS	Thu, Feb 11, 2016	5.58	5.60	5.03	5.20
4785	NASDAQ	CERS	Wed, Feb 10, 2016	6.02	6.07	5.62	5.66
4784	NASDAQ	CERS	Tue, Feb 9, 2016	6.30	6.44	6.00	6.02
4783	NASDAQ	CERS	Mon, Feb 8, 2016	5.40	5.72	5.32	5.69
4782	NASDAQ	CERS	Fri, Feb 5, 2016	5.52	5.55	5.29	5.43
4781	NASDAQ	CERS	Thu, Feb 4, 2016	5.32	5.46	5.31	5.38
4780	NASDAQ	CERS	Wed, Feb 3, 2016	5.38	5.45	5.19	5.33
4779	NASDAQ	CERS	Tue, Feb 2, 2016	5.27	5.36	5.16	5.29
4778	NASDAQ	CERS	Mon, Feb 1, 2016	5.42	5.49	5.27	5.32
4777	NASDAQ	CERS	Fri, Jan 29, 2016	5.33	5.51	5.28	5.43
4776	NASDAQ	CERS	Thu, Jan 28, 2016	5.20	5.80	4.98	5.26
4775	NASDAQ	CERS	Wed, Jan 27, 2016	5.35	5.42	5.10	5.19
4774	NASDAQ	CERS	Tue, Jan 26, 2016	5.39	5.42	5.18	5.39
4773	NASDAQ	CERS	Mon, Jan 25, 2016	5.55	5.58	5.31	5.32
4772	NASDAQ	CERS	Fri, Jan 22, 2016	5.69	5.75	5.50	5.57
4771	NASDAQ	CERS	Thu, Jan 21, 2016	5.52	5.83	5.48	5.64
4770	NASDAQ	CERS	Wed, Jan 20, 2016	5.13	5.53	5.00	5.52
4769	NASDAQ	CERS	Tue, Jan 19, 2016	5.41	5.49	5.20	5.23
4768	NASDAQ	CERS	Fri, Jan 15, 2016	5.39	5.43	5.16	5.36
4767	NASDAQ	CERS	Thu, Jan 14, 2016	5.31	5.60	5.29	5.53
4766	NASDAQ	CERS	Wed, Jan 13, 2016	5.51	5.62	5.28	5.29
4765	NASDAQ	CERS	Tue, Jan 12, 2016	5.67	5.79	5.33	5.51
4764	NASDAQ	CERS	Mon, Jan 11, 2016	5.89	5.94	5.59	5.62
4763	NASDAQ	CERS	Fri, Jan 8, 2016	5.94	6.11	5.83	5.84
4762	NASDAQ	CERS	Thu, Jan 7, 2016	6.11	6.11	5.85	5.94
4761	NASDAQ	CERS	Wed, Jan 6, 2016	6.35	6.35	6.14	6.20
4760	NASDAQ	CERS	Tue, Jan 5, 2016	6.49	6.66	6.28	6.40
4759	NASDAQ	CERS	Mon, Jan 4, 2016	6.19	6.27	6.03	6.24
4758	NASDAQ	CERS	Thu, Dec 31, 2015	6.45	6.46	6.26	6.32
4757	NASDAQ	CERS	Wed, Dec 30, 2015	6.44	6.60	6.42	6.46
4756	NASDAQ	CERS	Tue, Dec 29, 2015	6.46	6.55	6.26	6.45
4755	NASDAQ	CERS	Mon, Dec 28, 2015	6.30	6.57	6.26	6.46
4754	NASDAQ	CERS	Thu, Dec 24, 2015	5.99	6.37	5.99	6.32
4753	NASDAQ	CERS	Wed, Dec 23, 2015	5.65	6.06	5.56	5.99
4752	NASDAQ	CERS	Tue, Dec 22, 2015	5.85	5.92	5.70	5.77
4751	NASDAQ	CERS	Mon, Dec 21, 2015	5.93	6.00	5.76	5.86
4750	NASDAQ	CERS	Fri, Dec 18, 2015	5.94	6.00	5.82	5.90
4749	NASDAQ	CERS	Thu, Dec 17, 2015	6.34	6.37	5.90	5.93
4748	NASDAQ	CERS	Wed, Dec 16, 2015	6.25	6.60	6.21	6.59
4747	NASDAQ	CERS	Tue, Dec 15, 2015	6.37	6.37	6.09	6.23
4746	NASDAQ	CERS	Mon, Dec 14, 2015	6.34	6.57	6.27	6.37
4745	NASDAQ	CERS	Fri, Dec 11, 2015	6.11	6.42	6.11	6.41
4744	NASDAQ	CERS	Thu, Dec 10, 2015	5.98	6.29	5.90	6.22
4743	NASDAQ	CERS	Wed, Dec 9, 2015	5.93	6.00	5.75	5.96
4742	NASDAQ	CERS	Tue, Dec 8, 2015	5.75	5.97	5.73	5.91
4741	NASDAQ	CERS	Mon, Dec 7, 2015	5.70	5.81	5.63	5.79
4740	NASDAQ	CERS	Fri, Dec 4, 2015	5.72	5.85	5.65	5.78
4739	NASDAQ	CERS	Thu, Dec 3, 2015	5.75	5.83	5.67	5.70
4738	NASDAQ	CERS	Wed, Dec 2, 2015	5.72	5.94	5.71	5.75
4737	NASDAQ	CERS	Tue, Dec 1, 2015	5.60	5.73	5.57	5.71
4736	NASDAQ	CERS	Mon, Nov 30, 2015	5.68	5.80	5.64	5.67
4735	NASDAQ	CERS	Fri, Nov 27, 2015	5.64	5.79	5.60	5.72
4734	NASDAQ	CERS	Wed, Nov 25, 2015	5.40	5.68	5.35	5.64
4733	NASDAQ	CERS	Tue, Nov 24, 2015	5.26	5.45	5.24	5.38
4732	NASDAQ	CERS	Mon, Nov 23, 2015	5.08	5.35	5.01	5.29
4731	NASDAQ	CERS	Fri, Nov 20, 2015	5.09	5.12	5.02	5.06
4730	NASDAQ	CERS	Thu, Nov 19, 2015	5.14	5.20	5.01	5.04
4729	NASDAQ	CERS	Wed, Nov 18, 2015	5.11	5.20	5.05	5.19
4728	NASDAQ	CERS	Tue, Nov 17, 2015	5.20	5.21	5.08	5.10
4727	NASDAQ	CERS	Mon, Nov 16, 2015	5.20	5.20	5.12	5.19
4726	NASDAQ	CERS	Fri, Nov 13, 2015	4.98	5.21	4.98	5.20
4725	NASDAQ	CERS	Thu, Nov 12, 2015	5.03	5.13	5.00	5.01
4724	NASDAQ	CERS	Wed, Nov 11, 2015	5.18	5.21	5.06	5.08
4723	NASDAQ	CERS	Tue, Nov 10, 2015	5.11	5.20	5.02	5.14
4722	NASDAQ	CERS	Mon, Nov 9, 2015	5.34	5.40	5.04	5.11
4721	NASDAQ	CERS	Fri, Nov 6, 2015	5.04	5.42	4.82	5.38
4720	NASDAQ	CERS	Thu, Nov 5, 2015	5.23	5.37	5.14	5.15
4719	NASDAQ	CERS	Wed, Nov 4, 2015	5.14	5.23	5.00	5.15
4718	NASDAQ	CERS	Tue, Nov 3, 2015	5.05	5.20	4.87	5.14
4717	NASDAQ	CERS	Mon, Nov 2, 2015	5.10	5.50	5.02	5.07
4716	NASDAQ	CERS	Fri, Oct 30, 2015	4.86	5.04	4.75	4.77
4715	NASDAQ	CERS	Thu, Oct 29, 2015	4.88	5.02	4.82	4.83
4714	NASDAQ	CERS	Wed, Oct 28, 2015	4.75	4.95	4.61	4.93
4713	NASDAQ	CERS	Tue, Oct 27, 2015	4.59	4.79	4.56	4.65
4712	NASDAQ	CERS	Mon, Oct 26, 2015	4.52	4.69	4.48	4.61
4711	NASDAQ	CERS	Fri, Oct 23, 2015	4.42	4.59	4.38	4.54
4710	NASDAQ	CERS	Thu, Oct 22, 2015	4.44	4.50	4.27	4.36
4709	NASDAQ	CERS	Wed, Oct 21, 2015	4.62	4.69	4.36	4.46
4708	NASDAQ	CERS	Tue, Oct 20, 2015	4.58	4.64	4.51	4.54
4707	NASDAQ	CERS	Mon, Oct 19, 2015	4.65	4.73	4.49	4.58
4706	NASDAQ	CERS	Fri, Oct 16, 2015	4.84	4.84	4.56	4.69
4705	NASDAQ	CERS	Thu, Oct 15, 2015	4.48	4.84	4.48	4.81
4704	NASDAQ	CERS	Wed, Oct 14, 2015	4.56	4.60	4.43	4.49
4703	NASDAQ	CERS	Tue, Oct 13, 2015	4.58	4.60	4.49	4.53
4702	NASDAQ	CERS	Mon, Oct 12, 2015	4.61	4.65	4.47	4.58
4701	NASDAQ	CERS	Fri, Oct 9, 2015	4.62	4.74	4.56	4.61
4700	NASDAQ	CERS	Thu, Oct 8, 2015	4.70	4.71	4.53	4.60
4699	NASDAQ	CERS	Wed, Oct 7, 2015	4.65	4.80	4.57	4.73
4698	NASDAQ	CERS	Tue, Oct 6, 2015	4.84	4.93	4.56	4.65
4697	NASDAQ	CERS	Mon, Oct 5, 2015	4.84	4.95	4.71	4.80
4696	NASDAQ	CERS	Fri, Oct 2, 2015	4.50	4.85	4.50	4.81
4695	NASDAQ	CERS	Thu, Oct 1, 2015	4.55	4.60	4.32	4.55
4694	NASDAQ	CERS	Wed, Sep 30, 2015	4.58	4.62	4.43	4.54
4693	NASDAQ	CERS	Tue, Sep 29, 2015	4.88	4.93	4.40	4.52
4692	NASDAQ	CERS	Mon, Sep 28, 2015	5.06	5.06	4.75	4.85
4691	NASDAQ	CERS	Fri, Sep 25, 2015	5.46	5.46	5.02	5.09
4690	NASDAQ	CERS	Thu, Sep 24, 2015	5.22	5.40	5.16	5.39
4689	NASDAQ	CERS	Wed, Sep 23, 2015	5.36	5.37	5.14	5.24
4688	NASDAQ	CERS	Tue, Sep 22, 2015	5.54	5.54	5.31	5.37
4687	NASDAQ	CERS	Mon, Sep 21, 2015	5.84	5.85	5.20	5.59
4686	NASDAQ	CERS	Fri, Sep 18, 2015	5.79	5.87	5.71	5.79
4685	NASDAQ	CERS	Thu, Sep 17, 2015	5.57	5.86	5.57	5.85
4684	NASDAQ	CERS	Wed, Sep 16, 2015	5.62	5.66	5.48	5.57
4683	NASDAQ	CERS	Tue, Sep 15, 2015	5.57	5.69	5.52	5.65
4682	NASDAQ	CERS	Mon, Sep 14, 2015	5.72	5.77	5.50	5.58
4681	NASDAQ	CERS	Fri, Sep 11, 2015	5.65	5.70	5.57	5.68
4680	NASDAQ	CERS	Thu, Sep 10, 2015	5.51	5.65	5.50	5.64
4679	NASDAQ	CERS	Wed, Sep 9, 2015	5.38	5.58	5.34	5.51
4678	NASDAQ	CERS	Tue, Sep 8, 2015	5.36	5.44	5.20	5.34
4677	NASDAQ	CERS	Fri, Sep 4, 2015	4.88	5.27	4.85	5.24
4676	NASDAQ	CERS	Thu, Sep 3, 2015	5.06	5.16	4.91	4.93
4675	NASDAQ	CERS	Wed, Sep 2, 2015	4.79	5.08	4.65	5.06
4674	NASDAQ	CERS	Tue, Sep 1, 2015	4.87	4.93	4.66	4.72
4673	NASDAQ	CERS	Mon, Aug 31, 2015	4.80	5.02	4.80	4.96
4672	NASDAQ	CERS	Fri, Aug 28, 2015	4.92	4.97	4.81	4.85
4671	NASDAQ	CERS	Thu, Aug 27, 2015	4.85	4.97	4.76	4.93
4670	NASDAQ	CERS	Wed, Aug 26, 2015	4.79	4.91	4.61	4.77
4669	NASDAQ	CERS	Tue, Aug 25, 2015	4.64	4.84	4.47	4.68
4668	NASDAQ	CERS	Mon, Aug 24, 2015	4.39	4.73	4.29	4.44
4667	NASDAQ	CERS	Fri, Aug 21, 2015	4.60	4.89	4.60	4.73
4666	NASDAQ	CERS	Thu, Aug 20, 2015	4.93	5.01	4.80	4.80
4665	NASDAQ	CERS	Wed, Aug 19, 2015	5.09	5.11	4.94	5.00
4664	NASDAQ	CERS	Tue, Aug 18, 2015	4.91	5.11	4.89	5.09
4663	NASDAQ	CERS	Mon, Aug 17, 2015	4.77	4.90	4.72	4.89
4662	NASDAQ	CERS	Fri, Aug 14, 2015	4.75	4.79	4.64	4.76
4661	NASDAQ	CERS	Thu, Aug 13, 2015	4.95	5.03	4.77	4.77
4660	NASDAQ	CERS	Wed, Aug 12, 2015	4.85	5.00	4.74	4.98
4659	NASDAQ	CERS	Tue, Aug 11, 2015	4.90	5.00	4.84	4.93
4658	NASDAQ	CERS	Mon, Aug 10, 2015	5.02	5.05	4.80	4.94
4657	NASDAQ	CERS	Fri, Aug 7, 2015	4.80	5.22	4.70	5.00
4656	NASDAQ	CERS	Thu, Aug 6, 2015	5.15	5.30	4.90	4.98
4655	NASDAQ	CERS	Wed, Aug 5, 2015	5.31	5.43	5.02	5.13
4654	NASDAQ	CERS	Tue, Aug 4, 2015	5.18	5.38	5.18	5.25
4653	NASDAQ	CERS	Mon, Aug 3, 2015	5.40	5.43	5.11	5.21
4652	NASDAQ	CERS	Fri, Jul 31, 2015	5.36	5.50	5.31	5.43
4651	NASDAQ	CERS	Thu, Jul 30, 2015	5.40	5.46	5.22	5.34
4650	NASDAQ	CERS	Wed, Jul 29, 2015	5.41	5.54	5.35	5.40
4649	NASDAQ	CERS	Tue, Jul 28, 2015	5.25	5.45	5.14	5.40
4648	NASDAQ	CERS	Mon, Jul 27, 2015	5.16	5.27	4.98	5.20
4647	NASDAQ	CERS	Fri, Jul 24, 2015	5.46	5.52	5.18	5.19
4646	NASDAQ	CERS	Thu, Jul 23, 2015	5.60	5.69	5.43	5.49
4645	NASDAQ	CERS	Wed, Jul 22, 2015	5.60	5.67	5.49	5.58
4644	NASDAQ	CERS	Tue, Jul 21, 2015	5.78	5.85	5.63	5.64
4643	NASDAQ	CERS	Mon, Jul 20, 2015	5.67	5.82	5.67	5.75
4642	NASDAQ	CERS	Fri, Jul 17, 2015	5.62	5.69	5.53	5.68
4641	NASDAQ	CERS	Thu, Jul 16, 2015	5.52	5.67	5.47	5.60
4640	NASDAQ	CERS	Wed, Jul 15, 2015	5.45	5.52	5.43	5.47
4639	NASDAQ	CERS	Tue, Jul 14, 2015	5.28	5.50	5.28	5.43
4638	NASDAQ	CERS	Mon, Jul 13, 2015	5.14	5.44	5.14	5.30
4637	NASDAQ	CERS	Fri, Jul 10, 2015	5.07	5.17	5.03	5.06
4636	NASDAQ	CERS	Thu, Jul 9, 2015	5.00	5.18	4.95	5.02
4635	NASDAQ	CERS	Wed, Jul 8, 2015	4.97	5.05	4.87	4.95
4634	NASDAQ	CERS	Tue, Jul 7, 2015	4.99	5.10	4.86	5.03
4633	NASDAQ	CERS	Mon, Jul 6, 2015	4.90	5.04	4.81	5.02
4632	NASDAQ	CERS	Thu, Jul 2, 2015	5.08	5.08	4.86	4.94
4631	NASDAQ	CERS	Wed, Jul 1, 2015	5.25	5.45	5.01	5.05
4630	NASDAQ	CERS	Tue, Jun 30, 2015	5.19	5.32	5.12	5.19
4629	NASDAQ	CERS	Mon, Jun 29, 2015	5.35	5.37	5.21	5.22
4628	NASDAQ	CERS	Fri, Jun 26, 2015	5.48	5.51	5.15	5.41
4627	NASDAQ	CERS	Thu, Jun 25, 2015	5.39	5.53	5.39	5.44
4626	NASDAQ	CERS	Wed, Jun 24, 2015	5.62	5.66	5.35	5.38
4625	NASDAQ	CERS	Tue, Jun 23, 2015	5.66	5.70	5.52	5.61
4624	NASDAQ	CERS	Mon, Jun 22, 2015	5.42	5.58	5.40	5.54
4623	NASDAQ	CERS	Fri, Jun 19, 2015	5.39	5.42	5.27	5.38
4622	NASDAQ	CERS	Thu, Jun 18, 2015	5.42	5.45	5.28	5.37
4621	NASDAQ	CERS	Wed, Jun 17, 2015	5.42	5.52	5.26	5.27
4620	NASDAQ	CERS	Tue, Jun 16, 2015	5.33	5.43	5.29	5.40
4619	NASDAQ	CERS	Mon, Jun 15, 2015	5.34	5.42	5.25	5.35
4618	NASDAQ	CERS	Fri, Jun 12, 2015	5.38	5.50	5.36	5.40
4617	NASDAQ	CERS	Thu, Jun 11, 2015	5.44	5.51	5.35	5.39
4616	NASDAQ	CERS	Wed, Jun 10, 2015	5.27	5.51	5.19	5.40
4615	NASDAQ	CERS	Tue, Jun 9, 2015	5.50	5.51	5.27	5.27
4614	NASDAQ	CERS	Mon, Jun 8, 2015	5.41	5.62	5.40	5.49
4613	NASDAQ	CERS	Fri, Jun 5, 2015	5.22	5.50	5.17	5.42
4612	NASDAQ	CERS	Thu, Jun 4, 2015	5.21	5.36	5.20	5.20
4611	NASDAQ	CERS	Wed, Jun 3, 2015	5.25	5.33	5.20	5.24
4610	NASDAQ	CERS	Tue, Jun 2, 2015	5.13	5.31	5.10	5.24
4609	NASDAQ	CERS	Mon, Jun 1, 2015	5.01	5.22	5.01	5.13
4608	NASDAQ	CERS	Fri, May 29, 2015	4.94	5.24	4.94	4.98
4607	NASDAQ	CERS	Thu, May 28, 2015	4.63	4.95	4.57	4.92
4606	NASDAQ	CERS	Wed, May 27, 2015	4.54	4.69	4.48	4.67
4605	NASDAQ	CERS	Tue, May 26, 2015	4.44	4.57	4.35	4.54
4604	NASDAQ	CERS	Fri, May 22, 2015	4.55	4.62	4.45	4.46
4603	NASDAQ	CERS	Thu, May 21, 2015	4.59	4.63	4.52	4.55
4602	NASDAQ	CERS	Wed, May 20, 2015	4.59	4.65	4.49	4.59
4601	NASDAQ	CERS	Tue, May 19, 2015	4.62	4.68	4.55	4.60
4600	NASDAQ	CERS	Mon, May 18, 2015	4.59	4.61	4.48	4.60
4599	NASDAQ	CERS	Fri, May 15, 2015	4.66	4.69	4.53	4.61
4598	NASDAQ	CERS	Thu, May 14, 2015	4.71	4.73	4.58	4.65
4597	NASDAQ	CERS	Wed, May 13, 2015	4.79	4.84	4.64	4.69
4596	NASDAQ	CERS	Tue, May 12, 2015	4.75	4.86	4.63	4.77
4595	NASDAQ	CERS	Mon, May 11, 2015	4.62	4.79	4.59	4.77
4594	NASDAQ	CERS	Fri, May 8, 2015	4.61	4.66	4.47	4.65
4593	NASDAQ	CERS	Thu, May 7, 2015	4.67	4.67	4.45	4.54
4592	NASDAQ	CERS	Wed, May 6, 2015	4.31	4.71	4.31	4.67
4591	NASDAQ	CERS	Tue, May 5, 2015	4.65	4.65	4.30	4.49
4590	NASDAQ	CERS	Mon, May 4, 2015	4.44	4.71	4.41	4.66
4589	NASDAQ	CERS	Fri, May 1, 2015	4.48	4.54	4.30	4.42
4588	NASDAQ	CERS	Thu, Apr 30, 2015	4.41	4.57	4.40	4.44
4587	NASDAQ	CERS	Wed, Apr 29, 2015	4.52	4.59	4.39	4.46
4586	NASDAQ	CERS	Tue, Apr 28, 2015	4.70	4.70	4.38	4.52
4585	NASDAQ	CERS	Mon, Apr 27, 2015	4.81	4.85	4.50	4.70
4584	NASDAQ	CERS	Fri, Apr 24, 2015	4.65	4.94	4.63	4.79
4583	NASDAQ	CERS	Thu, Apr 23, 2015	4.28	4.73	4.15	4.59
4582	NASDAQ	CERS	Wed, Apr 22, 2015	4.02	4.11	3.96	4.10
4581	NASDAQ	CERS	Tue, Apr 21, 2015	4.07	4.14	3.99	4.05
4580	NASDAQ	CERS	Mon, Apr 20, 2015	4.10	4.10	3.97	4.05
4579	NASDAQ	CERS	Fri, Apr 17, 2015	4.19	4.20	3.98	4.03
4578	NASDAQ	CERS	Thu, Apr 16, 2015	4.28	4.32	4.16	4.24
4577	NASDAQ	CERS	Wed, Apr 15, 2015	4.28	4.32	4.11	4.30
4576	NASDAQ	CERS	Tue, Apr 14, 2015	4.04	4.16	4.03	4.12
4575	NASDAQ	CERS	Mon, Apr 13, 2015	3.90	4.03	3.89	4.03
4574	NASDAQ	CERS	Fri, Apr 10, 2015	3.89	3.92	3.83	3.90
4573	NASDAQ	CERS	Thu, Apr 9, 2015	3.92	4.00	3.82	3.87
4572	NASDAQ	CERS	Wed, Apr 8, 2015	3.86	3.96	3.82	3.94
4571	NASDAQ	CERS	Tue, Apr 7, 2015	3.91	4.05	3.84	3.86
4570	NASDAQ	CERS	Mon, Apr 6, 2015	3.90	3.97	3.85	3.92
4569	NASDAQ	CERS	Thu, Apr 2, 2015	3.95	3.96	3.82	3.91
4568	NASDAQ	CERS	Wed, Apr 1, 2015	4.15	4.23	3.95	3.97
4567	NASDAQ	CERS	Tue, Mar 31, 2015	4.20	4.26	4.12	4.17
4566	NASDAQ	CERS	Mon, Mar 30, 2015	4.15	4.24	4.12	4.23
4565	NASDAQ	CERS	Fri, Mar 27, 2015	4.23	4.27	4.07	4.10
4564	NASDAQ	CERS	Thu, Mar 26, 2015	4.00	4.22	4.00	4.21
4563	NASDAQ	CERS	Wed, Mar 25, 2015	4.20	4.20	3.99	4.02
4562	NASDAQ	CERS	Tue, Mar 24, 2015	4.15	4.29	4.15	4.22
4561	NASDAQ	CERS	Mon, Mar 23, 2015	4.30	4.30	4.13	4.16
4560	NASDAQ	CERS	Fri, Mar 20, 2015	4.40	4.46	4.21	4.29
4559	NASDAQ	CERS	Thu, Mar 19, 2015	4.15	4.38	4.15	4.34
4558	NASDAQ	CERS	Wed, Mar 18, 2015	4.17	4.20	4.08	4.15
4557	NASDAQ	CERS	Tue, Mar 17, 2015	4.25	4.27	4.14	4.20
4556	NASDAQ	CERS	Mon, Mar 16, 2015	4.24	4.26	4.15	4.26
4555	NASDAQ	CERS	Fri, Mar 13, 2015	4.10	4.18	3.95	4.12
4554	NASDAQ	CERS	Thu, Mar 12, 2015	4.07	4.15	4.06	4.10
4553	NASDAQ	CERS	Wed, Mar 11, 2015	4.11	4.16	3.98	4.02
4552	NASDAQ	CERS	Tue, Mar 10, 2015	4.24	4.26	4.05	4.11
4551	NASDAQ	CERS	Mon, Mar 9, 2015	4.41	4.41	4.25	4.28
4550	NASDAQ	CERS	Fri, Mar 6, 2015	4.42	4.43	4.32	4.41
4549	NASDAQ	CERS	Thu, Mar 5, 2015	4.45	4.58	4.36	4.45
4548	NASDAQ	CERS	Wed, Mar 4, 2015	4.41	4.54	4.31	4.46
4547	NASDAQ	CERS	Tue, Mar 3, 2015	4.42	4.48	4.25	4.44
4546	NASDAQ	CERS	Mon, Mar 2, 2015	4.77	4.81	4.45	4.46
4545	NASDAQ	CERS	Fri, Feb 27, 2015	5.16	5.18	4.54	4.78
4544	NASDAQ	CERS	Thu, Feb 26, 2015	5.46	5.52	5.33	5.35
4543	NASDAQ	CERS	Wed, Feb 25, 2015	5.43	5.68	5.35	5.47
4542	NASDAQ	CERS	Tue, Feb 24, 2015	5.50	5.50	5.32	5.46
4541	NASDAQ	CERS	Mon, Feb 23, 2015	5.68	5.68	5.36	5.47
4540	NASDAQ	CERS	Fri, Feb 20, 2015	5.45	5.57	5.41	5.50
4539	NASDAQ	CERS	Thu, Feb 19, 2015	5.51	5.51	5.42	5.43
4538	NASDAQ	CERS	Wed, Feb 18, 2015	5.52	5.52	5.39	5.49
4537	NASDAQ	CERS	Tue, Feb 17, 2015	5.52	5.65	5.45	5.54
4536	NASDAQ	CERS	Fri, Feb 13, 2015	5.45	5.53	5.33	5.53
4535	NASDAQ	CERS	Thu, Feb 12, 2015	5.43	5.51	5.37	5.45
4534	NASDAQ	CERS	Wed, Feb 11, 2015	5.57	5.64	5.40	5.40
4533	NASDAQ	CERS	Tue, Feb 10, 2015	5.48	5.65	5.37	5.61
4532	NASDAQ	CERS	Mon, Feb 9, 2015	5.65	5.65	5.40	5.43
4531	NASDAQ	CERS	Fri, Feb 6, 2015	5.80	5.86	5.58	5.66
4530	NASDAQ	CERS	Thu, Feb 5, 2015	5.51	5.86	5.50	5.79
4529	NASDAQ	CERS	Wed, Feb 4, 2015	5.34	5.51	5.28	5.42
4528	NASDAQ	CERS	Tue, Feb 3, 2015	5.20	5.34	5.13	5.33
4527	NASDAQ	CERS	Mon, Feb 2, 2015	5.35	5.40	5.16	5.21
4526	NASDAQ	CERS	Fri, Jan 30, 2015	5.42	5.53	5.32	5.34
4525	NASDAQ	CERS	Thu, Jan 29, 2015	5.53	5.58	5.35	5.46
4524	NASDAQ	CERS	Wed, Jan 28, 2015	5.37	5.62	5.31	5.49
4523	NASDAQ	CERS	Tue, Jan 27, 2015	5.42	5.43	5.26	5.36
4522	NASDAQ	CERS	Mon, Jan 26, 2015	5.26	5.53	5.19	5.52
4521	NASDAQ	CERS	Fri, Jan 23, 2015	5.28	5.35	5.13	5.29
4520	NASDAQ	CERS	Thu, Jan 22, 2015	5.29	5.32	5.01	5.31
4519	NASDAQ	CERS	Wed, Jan 21, 2015	5.70	5.70	5.20	5.25
4518	NASDAQ	CERS	Tue, Jan 20, 2015	5.88	5.88	5.53	5.73
4517	NASDAQ	CERS	Fri, Jan 16, 2015	5.78	5.97	5.78	5.89
4516	NASDAQ	CERS	Thu, Jan 15, 2015	6.11	6.17	5.72	5.79
4515	NASDAQ	CERS	Wed, Jan 14, 2015	5.90	6.21	5.90	6.07
4514	NASDAQ	CERS	Tue, Jan 13, 2015	6.22	6.29	5.90	6.11
4513	NASDAQ	CERS	Mon, Jan 12, 2015	6.13	6.25	6.05	6.22
4512	NASDAQ	CERS	Fri, Jan 9, 2015	6.11	6.27	6.02	6.15
4511	NASDAQ	CERS	Thu, Jan 8, 2015	6.00	6.14	5.91	6.13
4510	NASDAQ	CERS	Wed, Jan 7, 2015	6.05	6.22	5.85	5.95
4509	NASDAQ	CERS	Tue, Jan 6, 2015	6.05	6.30	5.72	5.78
4508	NASDAQ	CERS	Mon, Jan 5, 2015	6.82	7.03	6.46	6.57
4507	NASDAQ	CERS	Fri, Jan 2, 2015	6.27	6.65	6.25	6.52
4506	NASDAQ	CERS	Wed, Dec 31, 2014	6.23	6.38	6.18	6.24
4505	NASDAQ	CERS	Tue, Dec 30, 2014	6.21	6.37	6.16	6.24
4504	NASDAQ	CERS	Mon, Dec 29, 2014	6.42	6.58	6.16	6.26
4503	NASDAQ	CERS	Fri, Dec 26, 2014	6.59	6.77	6.51	6.54
4502	NASDAQ	CERS	Wed, Dec 24, 2014	6.19	6.56	6.17	6.49
4501	NASDAQ	CERS	Tue, Dec 23, 2014	6.68	6.75	6.08	6.20
4500	NASDAQ	CERS	Mon, Dec 22, 2014	6.42	6.80	6.38	6.77
4499	NASDAQ	CERS	Fri, Dec 19, 2014	6.85	6.93	6.37	6.41
4498	NASDAQ	CERS	Thu, Dec 18, 2014	5.89	6.29	5.89	6.16
4497	NASDAQ	CERS	Wed, Dec 17, 2014	5.60	5.94	5.26	5.86
4496	NASDAQ	CERS	Tue, Dec 16, 2014	4.62	4.87	4.58	4.78
4495	NASDAQ	CERS	Mon, Dec 15, 2014	4.94	5.00	4.62	4.64
4494	NASDAQ	CERS	Fri, Dec 12, 2014	4.56	4.93	4.55	4.87
4493	NASDAQ	CERS	Thu, Dec 11, 2014	4.64	4.79	4.59	4.60
4492	NASDAQ	CERS	Wed, Dec 10, 2014	4.54	4.77	4.47	4.62
4491	NASDAQ	CERS	Tue, Dec 9, 2014	4.23	4.57	4.20	4.54
4490	NASDAQ	CERS	Mon, Dec 8, 2014	4.31	4.39	4.23	4.31
4489	NASDAQ	CERS	Fri, Dec 5, 2014	4.25	4.39	4.21	4.31
4488	NASDAQ	CERS	Thu, Dec 4, 2014	4.25	4.36	4.20	4.24
4487	NASDAQ	CERS	Wed, Dec 3, 2014	4.28	4.37	4.22	4.23
4486	NASDAQ	CERS	Tue, Dec 2, 2014	4.31	4.37	4.24	4.26
4485	NASDAQ	CERS	Mon, Dec 1, 2014	4.55	4.58	4.27	4.29
4484	NASDAQ	CERS	Fri, Nov 28, 2014	4.39	4.70	4.39	4.53
4483	NASDAQ	CERS	Wed, Nov 26, 2014	4.29	4.40	4.25	4.39
4482	NASDAQ	CERS	Tue, Nov 25, 2014	4.25	4.31	4.21	4.29
4481	NASDAQ	CERS	Mon, Nov 24, 2014	4.27	4.29	4.15	4.25
4480	NASDAQ	CERS	Fri, Nov 21, 2014	4.45	4.48	4.21	4.26
4479	NASDAQ	CERS	Thu, Nov 20, 2014	4.25	4.32	4.22	4.29
4478	NASDAQ	CERS	Wed, Nov 19, 2014	4.33	4.36	4.18	4.28
4477	NASDAQ	CERS	Tue, Nov 18, 2014	4.29	4.35	4.25	4.28
4476	NASDAQ	CERS	Mon, Nov 17, 2014	4.39	4.44	4.26	4.28
4475	NASDAQ	CERS	Fri, Nov 14, 2014	4.40	4.44	4.22	4.41
4474	NASDAQ	CERS	Thu, Nov 13, 2014	4.37	4.65	4.29	4.38
4473	NASDAQ	CERS	Wed, Nov 12, 2014	4.21	4.22	4.12	4.19
4472	NASDAQ	CERS	Tue, Nov 11, 2014	4.07	4.26	4.00	4.20
4471	NASDAQ	CERS	Mon, Nov 10, 2014	4.00	4.04	3.86	4.03
4470	NASDAQ	CERS	Fri, Nov 7, 2014	3.95	4.02	3.85	4.01
4469	NASDAQ	CERS	Thu, Nov 6, 2014	3.91	3.98	3.80	3.98
4468	NASDAQ	CERS	Wed, Nov 5, 2014	4.02	4.02	3.80	3.92
4467	NASDAQ	CERS	Tue, Nov 4, 2014	4.13	4.16	4.07	4.09
4466	NASDAQ	CERS	Mon, Nov 3, 2014	4.20	4.28	4.09	4.16
4465	NASDAQ	CERS	Fri, Oct 31, 2014	4.43	4.53	4.15	4.16
4464	NASDAQ	CERS	Thu, Oct 30, 2014	4.20	4.32	4.17	4.32
4463	NASDAQ	CERS	Wed, Oct 29, 2014	4.23	4.30	4.16	4.19
4462	NASDAQ	CERS	Tue, Oct 28, 2014	4.13	4.23	4.05	4.21
4461	NASDAQ	CERS	Mon, Oct 27, 2014	4.09	4.19	4.03	4.13
4460	NASDAQ	CERS	Fri, Oct 24, 2014	4.14	4.16	4.02	4.14
4459	NASDAQ	CERS	Thu, Oct 23, 2014	4.13	4.22	4.04	4.12
4458	NASDAQ	CERS	Wed, Oct 22, 2014	4.19	4.19	4.01	4.11
4457	NASDAQ	CERS	Tue, Oct 21, 2014	4.21	4.38	4.17	4.19
4456	NASDAQ	CERS	Mon, Oct 20, 2014	4.23	4.31	4.14	4.30
4455	NASDAQ	CERS	Fri, Oct 17, 2014	4.33	4.33	4.04	4.05
4454	NASDAQ	CERS	Thu, Oct 16, 2014	4.14	4.35	4.10	4.25
4453	NASDAQ	CERS	Wed, Oct 15, 2014	4.05	4.26	3.85	4.21
4452	NASDAQ	CERS	Tue, Oct 14, 2014	4.18	4.39	4.03	4.10
4451	NASDAQ	CERS	Mon, Oct 13, 2014	3.67	3.89	3.60	3.86
4450	NASDAQ	CERS	Fri, Oct 10, 2014	3.71	3.82	3.63	3.64
4449	NASDAQ	CERS	Thu, Oct 9, 2014	3.92	3.92	3.70	3.75
4448	NASDAQ	CERS	Wed, Oct 8, 2014	3.85	3.94	3.72	3.94
4447	NASDAQ	CERS	Tue, Oct 7, 2014	4.04	4.18	3.90	3.90
4446	NASDAQ	CERS	Mon, Oct 6, 2014	4.13	4.20	3.98	4.00
4445	NASDAQ	CERS	Fri, Oct 3, 2014	3.91	4.09	3.89	4.07
4444	NASDAQ	CERS	Thu, Oct 2, 2014	3.80	3.90	3.72	3.84
4443	NASDAQ	CERS	Wed, Oct 1, 2014	4.02	4.08	3.75	3.81
4442	NASDAQ	CERS	Tue, Sep 30, 2014	3.91	4.06	3.88	4.01
4441	NASDAQ	CERS	Mon, Sep 29, 2014	3.76	3.92	3.73	3.91
4440	NASDAQ	CERS	Fri, Sep 26, 2014	3.88	3.95	3.77	3.81
4439	NASDAQ	CERS	Thu, Sep 25, 2014	3.92	3.93	3.80	3.88
4438	NASDAQ	CERS	Wed, Sep 24, 2014	3.92	3.96	3.85	3.95
4437	NASDAQ	CERS	Tue, Sep 23, 2014	3.94	3.99	3.82	3.90
4436	NASDAQ	CERS	Mon, Sep 22, 2014	3.99	3.99	3.85	3.97
4435	NASDAQ	CERS	Fri, Sep 19, 2014	4.01	4.15	3.90	4.01
4434	NASDAQ	CERS	Thu, Sep 18, 2014	3.99	4.03	3.95	4.00
4433	NASDAQ	CERS	Wed, Sep 17, 2014	4.01	4.08	3.94	3.96
4432	NASDAQ	CERS	Tue, Sep 16, 2014	3.94	4.03	3.90	4.01
4431	NASDAQ	CERS	Mon, Sep 15, 2014	4.10	4.20	3.93	3.95
4430	NASDAQ	CERS	Fri, Sep 12, 2014	4.04	4.12	3.99	4.11
4429	NASDAQ	CERS	Thu, Sep 11, 2014	4.10	4.12	3.97	4.05
4428	NASDAQ	CERS	Wed, Sep 10, 2014	4.21	4.29	4.02	4.11
4427	NASDAQ	CERS	Tue, Sep 9, 2014	3.88	4.30	3.88	4.14
4426	NASDAQ	CERS	Mon, Sep 8, 2014	3.84	3.95	3.81	3.91
4425	NASDAQ	CERS	Fri, Sep 5, 2014	3.82	3.91	3.76	3.84
4424	NASDAQ	CERS	Thu, Sep 4, 2014	3.79	3.95	3.76	3.82
4423	NASDAQ	CERS	Wed, Sep 3, 2014	3.80	3.81	3.72	3.76
4422	NASDAQ	CERS	Tue, Sep 2, 2014	3.79	3.79	3.69	3.79
4421	NASDAQ	CERS	Fri, Aug 29, 2014	3.72	3.78	3.63	3.76
4420	NASDAQ	CERS	Thu, Aug 28, 2014	3.73	3.74	3.63	3.68
4419	NASDAQ	CERS	Wed, Aug 27, 2014	3.79	3.80	3.70	3.76
4418	NASDAQ	CERS	Tue, Aug 26, 2014	3.70	3.81	3.68	3.78
4417	NASDAQ	CERS	Mon, Aug 25, 2014	3.73	3.78	3.66	3.69
4416	NASDAQ	CERS	Fri, Aug 22, 2014	3.65	3.76	3.61	3.71
4415	NASDAQ	CERS	Thu, Aug 21, 2014	3.67	3.74	3.62	3.64
4414	NASDAQ	CERS	Wed, Aug 20, 2014	3.75	3.77	3.67	3.67
4413	NASDAQ	CERS	Tue, Aug 19, 2014	3.80	3.82	3.75	3.76
4412	NASDAQ	CERS	Mon, Aug 18, 2014	3.80	3.93	3.77	3.82
4411	NASDAQ	CERS	Fri, Aug 15, 2014	3.68	3.78	3.56	3.75
4410	NASDAQ	CERS	Thu, Aug 14, 2014	3.67	3.69	3.57	3.63
4409	NASDAQ	CERS	Wed, Aug 13, 2014	3.62	3.70	3.58	3.69
4408	NASDAQ	CERS	Tue, Aug 12, 2014	3.73	3.76	3.60	3.61
4407	NASDAQ	CERS	Mon, Aug 11, 2014	3.72	3.79	3.68	3.76
4406	NASDAQ	CERS	Fri, Aug 8, 2014	3.71	3.74	3.60	3.71
4405	NASDAQ	CERS	Thu, Aug 7, 2014	3.86	3.89	3.69	3.74
4404	NASDAQ	CERS	Wed, Aug 6, 2014	3.58	3.90	3.58	3.86
4403	NASDAQ	CERS	Tue, Aug 5, 2014	3.70	3.77	3.53	3.61
4402	NASDAQ	CERS	Mon, Aug 4, 2014	3.80	3.83	3.60	3.75
4401	NASDAQ	CERS	Fri, Aug 1, 2014	3.54	3.88	3.54	3.81
4400	NASDAQ	CERS	Thu, Jul 31, 2014	3.56	3.61	3.51	3.52
4399	NASDAQ	CERS	Wed, Jul 30, 2014	3.71	3.77	3.61	3.63
4398	NASDAQ	CERS	Tue, Jul 29, 2014	3.51	3.75	3.49	3.71
4397	NASDAQ	CERS	Mon, Jul 28, 2014	3.66	3.66	3.48	3.50
4396	NASDAQ	CERS	Fri, Jul 25, 2014	3.73	3.77	3.59	3.64
4395	NASDAQ	CERS	Thu, Jul 24, 2014	3.81	3.85	3.75	3.77
4394	NASDAQ	CERS	Wed, Jul 23, 2014	3.84	3.90	3.77	3.79
4393	NASDAQ	CERS	Tue, Jul 22, 2014	3.87	3.93	3.79	3.80
4392	NASDAQ	CERS	Mon, Jul 21, 2014	3.86	3.94	3.78	3.85
4391	NASDAQ	CERS	Fri, Jul 18, 2014	3.75	3.95	3.75	3.88
4390	NASDAQ	CERS	Thu, Jul 17, 2014	3.76	3.83	3.73	3.74
4389	NASDAQ	CERS	Wed, Jul 16, 2014	3.91	3.91	3.76	3.78
4388	NASDAQ	CERS	Tue, Jul 15, 2014	4.04	4.07	3.85	3.89
4387	NASDAQ	CERS	Mon, Jul 14, 2014	4.19	4.25	4.03	4.03
4386	NASDAQ	CERS	Fri, Jul 11, 2014	4.00	4.15	3.99	4.12
4385	NASDAQ	CERS	Thu, Jul 10, 2014	3.80	4.04	3.70	4.02
4384	NASDAQ	CERS	Wed, Jul 9, 2014	3.76	3.89	3.69	3.83
4383	NASDAQ	CERS	Tue, Jul 8, 2014	3.95	3.95	3.66	3.76
4382	NASDAQ	CERS	Mon, Jul 7, 2014	4.25	4.25	3.95	3.95
4381	NASDAQ	CERS	Thu, Jul 3, 2014	4.30	4.35	4.23	4.25
4380	NASDAQ	CERS	Wed, Jul 2, 2014	4.30	4.36	4.26	4.29
4379	NASDAQ	CERS	Tue, Jul 1, 2014	4.15	4.35	4.15	4.30
4378	NASDAQ	CERS	Mon, Jun 30, 2014	4.09	4.25	4.02	4.15
4377	NASDAQ	CERS	Fri, Jun 27, 2014	4.03	4.11	4.03	4.10
4376	NASDAQ	CERS	Thu, Jun 26, 2014	4.12	4.14	4.02	4.06
4375	NASDAQ	CERS	Wed, Jun 25, 2014	4.14	4.18	4.08	4.11
4374	NASDAQ	CERS	Tue, Jun 24, 2014	4.11	4.20	4.08	4.09
4373	NASDAQ	CERS	Mon, Jun 23, 2014	4.08	4.15	4.06	4.13
4372	NASDAQ	CERS	Fri, Jun 20, 2014	4.21	4.21	4.02	4.08
4371	NASDAQ	CERS	Thu, Jun 19, 2014	4.30	4.34	4.18	4.22
4370	NASDAQ	CERS	Wed, Jun 18, 2014	4.34	4.34	4.23	4.29
4369	NASDAQ	CERS	Tue, Jun 17, 2014	4.25	4.41	4.21	4.34
4368	NASDAQ	CERS	Mon, Jun 16, 2014	4.32	4.43	4.23	4.28
4367	NASDAQ	CERS	Fri, Jun 13, 2014	4.20	4.36	4.19	4.32
4366	NASDAQ	CERS	Thu, Jun 12, 2014	4.33	4.34	4.22	4.25
4365	NASDAQ	CERS	Wed, Jun 11, 2014	4.22	4.43	4.19	4.34
4364	NASDAQ	CERS	Tue, Jun 10, 2014	4.19	4.26	4.13	4.25
4363	NASDAQ	CERS	Mon, Jun 9, 2014	4.18	4.26	4.16	4.22
4362	NASDAQ	CERS	Fri, Jun 6, 2014	4.23	4.27	4.18	4.18
4361	NASDAQ	CERS	Thu, Jun 5, 2014	4.06	4.23	4.00	4.18
4360	NASDAQ	CERS	Wed, Jun 4, 2014	3.87	4.07	3.84	4.04
4359	NASDAQ	CERS	Tue, Jun 3, 2014	3.97	4.00	3.84	3.89
4358	NASDAQ	CERS	Mon, Jun 2, 2014	4.19	4.23	3.97	3.97
4357	NASDAQ	CERS	Fri, May 30, 2014	4.34	4.37	4.01	4.19
4356	NASDAQ	CERS	Thu, May 29, 2014	4.40	4.50	4.31	4.32
4355	NASDAQ	CERS	Wed, May 28, 2014	4.30	4.36	4.21	4.24
4354	NASDAQ	CERS	Tue, May 27, 2014	4.20	4.36	4.13	4.30
4353	NASDAQ	CERS	Fri, May 23, 2014	4.13	4.20	4.10	4.20
4352	NASDAQ	CERS	Thu, May 22, 2014	4.08	4.18	4.02	4.14
4351	NASDAQ	CERS	Wed, May 21, 2014	4.11	4.14	4.05	4.06
4350	NASDAQ	CERS	Tue, May 20, 2014	4.09	4.13	3.98	4.09
4349	NASDAQ	CERS	Mon, May 19, 2014	3.99	4.13	3.98	4.12
4348	NASDAQ	CERS	Fri, May 16, 2014	3.92	4.05	3.87	4.03
4347	NASDAQ	CERS	Thu, May 15, 2014	3.84	3.92	3.76	3.92
4346	NASDAQ	CERS	Wed, May 14, 2014	4.03	4.09	3.89	3.89
4345	NASDAQ	CERS	Tue, May 13, 2014	4.07	4.17	4.00	4.06
4344	NASDAQ	CERS	Mon, May 12, 2014	3.91	4.09	3.91	4.08
4343	NASDAQ	CERS	Fri, May 9, 2014	3.82	3.97	3.76	3.89
4342	NASDAQ	CERS	Thu, May 8, 2014	3.82	3.97	3.75	3.80
4341	NASDAQ	CERS	Wed, May 7, 2014	3.87	3.98	3.78	3.86
4340	NASDAQ	CERS	Tue, May 6, 2014	4.04	4.15	3.92	3.94
4339	NASDAQ	CERS	Mon, May 5, 2014	3.88	4.15	3.83	4.13
4338	NASDAQ	CERS	Fri, May 2, 2014	4.48	4.48	3.74	3.84
4337	NASDAQ	CERS	Thu, May 1, 2014	4.50	4.50	4.23	4.36
4336	NASDAQ	CERS	Wed, Apr 30, 2014	4.50	4.53	4.28	4.33
4335	NASDAQ	CERS	Tue, Apr 29, 2014	4.45	4.60	4.45	4.53
4334	NASDAQ	CERS	Mon, Apr 28, 2014	4.38	4.44	4.24	4.43
4333	NASDAQ	CERS	Fri, Apr 25, 2014	4.51	4.53	4.25	4.33
4332	NASDAQ	CERS	Thu, Apr 24, 2014	4.67	4.75	4.41	4.55
4331	NASDAQ	CERS	Wed, Apr 23, 2014	4.68	4.71	4.56	4.63
4330	NASDAQ	CERS	Tue, Apr 22, 2014	4.61	4.75	4.59	4.67
4329	NASDAQ	CERS	Mon, Apr 21, 2014	4.54	4.60	4.45	4.58
4328	NASDAQ	CERS	Thu, Apr 17, 2014	4.42	4.64	4.29	4.50
4327	NASDAQ	CERS	Wed, Apr 16, 2014	4.47	4.57	4.39	4.44
4326	NASDAQ	CERS	Tue, Apr 15, 2014	4.36	4.51	4.15	4.42
4325	NASDAQ	CERS	Mon, Apr 14, 2014	4.42	4.50	4.25	4.34
4324	NASDAQ	CERS	Fri, Apr 11, 2014	4.41	4.60	4.31	4.33
4323	NASDAQ	CERS	Thu, Apr 10, 2014	4.85	4.85	4.39	4.48
4322	NASDAQ	CERS	Wed, Apr 9, 2014	4.69	4.84	4.68	4.84
4321	NASDAQ	CERS	Tue, Apr 8, 2014	4.84	4.93	4.51	4.64
4320	NASDAQ	CERS	Mon, Apr 7, 2014	4.98	4.98	4.76	4.81
4319	NASDAQ	CERS	Fri, Apr 4, 2014	5.07	5.09	4.82	4.93
4318	NASDAQ	CERS	Thu, Apr 3, 2014	5.15	5.18	4.99	5.04
4317	NASDAQ	CERS	Wed, Apr 2, 2014	4.92	5.19	4.87	5.18
4316	NASDAQ	CERS	Tue, Apr 1, 2014	4.86	5.01	4.82	4.91
4315	NASDAQ	CERS	Mon, Mar 31, 2014	4.90	4.97	4.79	4.80
4314	NASDAQ	CERS	Fri, Mar 28, 2014	4.92	5.07	4.77	4.83
4313	NASDAQ	CERS	Thu, Mar 27, 2014	4.90	5.05	4.77	4.92
4312	NASDAQ	CERS	Wed, Mar 26, 2014	5.07	5.20	4.81	4.90
4311	NASDAQ	CERS	Tue, Mar 25, 2014	5.06	5.30	4.77	4.99
4310	NASDAQ	CERS	Mon, Mar 24, 2014	5.70	5.70	4.95	5.03
4309	NASDAQ	CERS	Fri, Mar 21, 2014	5.90	5.90	5.63	5.66
4308	NASDAQ	CERS	Thu, Mar 20, 2014	5.91	5.99	5.80	5.85
4307	NASDAQ	CERS	Wed, Mar 19, 2014	6.02	6.14	5.85	5.93
4306	NASDAQ	CERS	Tue, Mar 18, 2014	6.01	6.08	5.93	6.00
4305	NASDAQ	CERS	Mon, Mar 17, 2014	5.94	6.06	5.85	5.98
4304	NASDAQ	CERS	Fri, Mar 14, 2014	5.91	6.01	5.86	5.90
4303	NASDAQ	CERS	Thu, Mar 13, 2014	6.10	6.21	5.82	5.96
4302	NASDAQ	CERS	Wed, Mar 12, 2014	6.00	6.13	5.95	6.06
4301	NASDAQ	CERS	Tue, Mar 11, 2014	6.09	6.22	5.96	6.03
4300	NASDAQ	CERS	Mon, Mar 10, 2014	6.10	6.26	6.02	6.10
4299	NASDAQ	CERS	Fri, Mar 7, 2014	6.25	6.36	6.02	6.11
4298	NASDAQ	CERS	Thu, Mar 6, 2014	6.20	6.27	6.02	6.18
4297	NASDAQ	CERS	Wed, Mar 5, 2014	6.46	6.50	6.15	6.19
4296	NASDAQ	CERS	Tue, Mar 4, 2014	6.37	6.72	6.37	6.48
4295	NASDAQ	CERS	Mon, Mar 3, 2014	6.37	6.44	6.25	6.28
4294	NASDAQ	CERS	Fri, Feb 28, 2014	6.49	6.61	6.31	6.46
4293	NASDAQ	CERS	Thu, Feb 27, 2014	6.53	6.70	6.32	6.57
4292	NASDAQ	CERS	Wed, Feb 26, 2014	7.00	7.00	6.06	6.58
4291	NASDAQ	CERS	Tue, Feb 25, 2014	7.84	8.00	7.75	7.95
4290	NASDAQ	CERS	Mon, Feb 24, 2014	7.56	7.92	7.53	7.81
4289	NASDAQ	CERS	Fri, Feb 21, 2014	7.54	7.67	7.30	7.51
4288	NASDAQ	CERS	Thu, Feb 20, 2014	7.26	7.44	7.21	7.42
4287	NASDAQ	CERS	Wed, Feb 19, 2014	7.63	7.74	7.21	7.23
4286	NASDAQ	CERS	Tue, Feb 18, 2014	7.53	7.69	7.37	7.62
4285	NASDAQ	CERS	Fri, Feb 14, 2014	7.40	7.55	7.28	7.47
4284	NASDAQ	CERS	Thu, Feb 13, 2014	7.14	7.43	7.06	7.40
4283	NASDAQ	CERS	Wed, Feb 12, 2014	7.07	7.54	7.01	7.20
4282	NASDAQ	CERS	Tue, Feb 11, 2014	6.55	7.12	6.52	7.01
4281	NASDAQ	CERS	Mon, Feb 10, 2014	6.40	6.48	6.28	6.48
4280	NASDAQ	CERS	Fri, Feb 7, 2014	6.06	6.50	6.06	6.39
4279	NASDAQ	CERS	Thu, Feb 6, 2014	6.01	6.14	5.95	6.00
4278	NASDAQ	CERS	Wed, Feb 5, 2014	5.94	6.01	5.76	6.01
4277	NASDAQ	CERS	Tue, Feb 4, 2014	5.76	6.05	5.75	5.96
4276	NASDAQ	CERS	Mon, Feb 3, 2014	6.18	6.32	5.77	5.79
4275	NASDAQ	CERS	Fri, Jan 31, 2014	6.15	6.25	6.11	6.17
4274	NASDAQ	CERS	Thu, Jan 30, 2014	6.17	6.34	6.15	6.28
4273	NASDAQ	CERS	Wed, Jan 29, 2014	6.20	6.32	6.04	6.12
4272	NASDAQ	CERS	Tue, Jan 28, 2014	6.19	6.31	6.14	6.27
4271	NASDAQ	CERS	Mon, Jan 27, 2014	6.28	6.32	6.00	6.18
4270	NASDAQ	CERS	Fri, Jan 24, 2014	6.42	6.45	6.10	6.24
4269	NASDAQ	CERS	Thu, Jan 23, 2014	6.76	6.76	6.36	6.44
4268	NASDAQ	CERS	Wed, Jan 22, 2014	6.83	6.84	6.71	6.77
4267	NASDAQ	CERS	Tue, Jan 21, 2014	6.87	6.98	6.74	6.79
4266	NASDAQ	CERS	Fri, Jan 17, 2014	6.83	6.88	6.71	6.80
4265	NASDAQ	CERS	Thu, Jan 16, 2014	7.00	7.07	6.79	6.81
4264	NASDAQ	CERS	Wed, Jan 15, 2014	7.38	7.58	6.86	7.00
4263	NASDAQ	CERS	Tue, Jan 14, 2014	7.43	7.59	7.37	7.39
4262	NASDAQ	CERS	Mon, Jan 13, 2014	7.33	7.85	7.28	7.35
4261	NASDAQ	CERS	Fri, Jan 10, 2014	7.28	7.41	7.10	7.34
4260	NASDAQ	CERS	Thu, Jan 9, 2014	7.25	7.42	7.19	7.25
4259	NASDAQ	CERS	Wed, Jan 8, 2014	6.83	7.25	6.81	7.25
4258	NASDAQ	CERS	Tue, Jan 7, 2014	6.56	6.84	6.50	6.82
4257	NASDAQ	CERS	Mon, Jan 6, 2014	6.62	6.68	6.40	6.57
4256	NASDAQ	CERS	Fri, Jan 3, 2014	6.49	6.69	6.47	6.63
4255	NASDAQ	CERS	Thu, Jan 2, 2014	6.45	6.52	6.23	6.48
4254	NASDAQ	CERS	Tue, Dec 31, 2013	6.12	6.49	6.06	6.45
4253	NASDAQ	CERS	Mon, Dec 30, 2013	6.16	6.18	5.99	6.11
4252	NASDAQ	CERS	Fri, Dec 27, 2013	6.36	6.36	6.13	6.18
4251	NASDAQ	CERS	Thu, Dec 26, 2013	6.50	6.53	6.31	6.33
4250	NASDAQ	CERS	Tue, Dec 24, 2013	6.28	6.52	6.18	6.46
4249	NASDAQ	CERS	Mon, Dec 23, 2013	6.15	6.32	6.15	6.25
4248	NASDAQ	CERS	Fri, Dec 20, 2013	5.86	6.21	5.66	6.12
4247	NASDAQ	CERS	Thu, Dec 19, 2013	5.84	5.91	5.78	5.83
4246	NASDAQ	CERS	Wed, Dec 18, 2013	5.71	5.87	5.61	5.87
4245	NASDAQ	CERS	Tue, Dec 17, 2013	5.86	5.86	5.70	5.72
4244	NASDAQ	CERS	Mon, Dec 16, 2013	5.76	5.96	5.76	5.84
4243	NASDAQ	CERS	Fri, Dec 13, 2013	5.77	5.85	5.68	5.70
4242	NASDAQ	CERS	Thu, Dec 12, 2013	5.77	5.85	5.70	5.78
4241	NASDAQ	CERS	Wed, Dec 11, 2013	5.94	6.05	5.70	5.78
4240	NASDAQ	CERS	Tue, Dec 10, 2013	6.02	6.08	5.85	5.90
4239	NASDAQ	CERS	Mon, Dec 9, 2013	6.28	6.29	5.98	6.03
4238	NASDAQ	CERS	Fri, Dec 6, 2013	6.20	6.32	6.09	6.25
4237	NASDAQ	CERS	Thu, Dec 5, 2013	6.41	6.45	6.10	6.14
4236	NASDAQ	CERS	Wed, Dec 4, 2013	6.55	6.55	6.25	6.43
4235	NASDAQ	CERS	Tue, Dec 3, 2013	6.70	6.81	6.37	6.44
4234	NASDAQ	CERS	Mon, Dec 2, 2013	6.70	6.77	6.63	6.74
4233	NASDAQ	CERS	Fri, Nov 29, 2013	6.69	6.86	6.69	6.69
4232	NASDAQ	CERS	Wed, Nov 27, 2013	6.66	6.74	6.59	6.68
4231	NASDAQ	CERS	Tue, Nov 26, 2013	6.30	6.67	6.30	6.63
4230	NASDAQ	CERS	Mon, Nov 25, 2013	6.58	6.77	6.20	6.28
4229	NASDAQ	CERS	Fri, Nov 22, 2013	6.25	6.58	6.22	6.51
4228	NASDAQ	CERS	Thu, Nov 21, 2013	6.01	6.25	6.01	6.23
4227	NASDAQ	CERS	Wed, Nov 20, 2013	6.06	6.17	5.90	5.98
4226	NASDAQ	CERS	Tue, Nov 19, 2013	5.74	6.08	5.68	5.99
4225	NASDAQ	CERS	Mon, Nov 18, 2013	5.93	5.97	5.70	5.75
4224	NASDAQ	CERS	Fri, Nov 15, 2013	5.90	5.97	5.85	5.93
4223	NASDAQ	CERS	Thu, Nov 14, 2013	5.92	5.93	5.79	5.91
4222	NASDAQ	CERS	Wed, Nov 13, 2013	5.74	5.93	5.71	5.91
4221	NASDAQ	CERS	Tue, Nov 12, 2013	5.78	5.84	5.70	5.78
4220	NASDAQ	CERS	Mon, Nov 11, 2013	5.91	5.97	5.77	5.78
4219	NASDAQ	CERS	Fri, Nov 8, 2013	5.77	5.97	5.71	5.91
4218	NASDAQ	CERS	Thu, Nov 7, 2013	5.96	6.12	5.74	5.77
4217	NASDAQ	CERS	Wed, Nov 6, 2013	6.40	6.42	5.84	5.90
4216	NASDAQ	CERS	Tue, Nov 5, 2013	6.36	6.44	6.26	6.37
4215	NASDAQ	CERS	Mon, Nov 4, 2013	6.46	6.46	6.27	6.38
4214	NASDAQ	CERS	Fri, Nov 1, 2013	6.31	6.44	6.22	6.41
4213	NASDAQ	CERS	Thu, Oct 31, 2013	6.28	6.32	6.04	6.31
4212	NASDAQ	CERS	Wed, Oct 30, 2013	6.89	6.93	5.97	6.31
4211	NASDAQ	CERS	Tue, Oct 29, 2013	6.76	6.95	6.65	6.94
4210	NASDAQ	CERS	Mon, Oct 28, 2013	6.79	6.86	6.69	6.72
4209	NASDAQ	CERS	Fri, Oct 25, 2013	6.61	6.79	6.60	6.77
4208	NASDAQ	CERS	Thu, Oct 24, 2013	6.45	6.61	6.39	6.52
4207	NASDAQ	CERS	Wed, Oct 23, 2013	6.40	6.52	6.34	6.43
4206	NASDAQ	CERS	Tue, Oct 22, 2013	6.47	6.57	6.32	6.45
4205	NASDAQ	CERS	Mon, Oct 21, 2013	6.66	6.76	6.45	6.45
4204	NASDAQ	CERS	Fri, Oct 18, 2013	6.66	6.70	6.55	6.63
4203	NASDAQ	CERS	Thu, Oct 17, 2013	6.52	6.68	6.50	6.58
4202	NASDAQ	CERS	Wed, Oct 16, 2013	6.47	6.62	6.41	6.54
4201	NASDAQ	CERS	Tue, Oct 15, 2013	6.40	6.54	6.38	6.43
4200	NASDAQ	CERS	Mon, Oct 14, 2013	6.48	6.51	6.35	6.44
4199	NASDAQ	CERS	Fri, Oct 11, 2013	6.40	6.58	6.31	6.51
4198	NASDAQ	CERS	Thu, Oct 10, 2013	6.19	6.62	6.16	6.40
4197	NASDAQ	CERS	Wed, Oct 9, 2013	6.30	6.33	6.06	6.12
4196	NASDAQ	CERS	Tue, Oct 8, 2013	6.61	6.65	6.24	6.29
4195	NASDAQ	CERS	Mon, Oct 7, 2013	6.76	6.84	6.52	6.63
4194	NASDAQ	CERS	Fri, Oct 4, 2013	6.87	6.94	6.80	6.85
4193	NASDAQ	CERS	Thu, Oct 3, 2013	7.05	7.13	6.70	6.84
4192	NASDAQ	CERS	Wed, Oct 2, 2013	6.77	6.95	6.72	6.91
4191	NASDAQ	CERS	Tue, Oct 1, 2013	6.70	6.95	6.67	6.79
4190	NASDAQ	CERS	Mon, Sep 30, 2013	6.28	6.77	6.20	6.72
4189	NASDAQ	CERS	Fri, Sep 27, 2013	6.04	6.43	6.01	6.34
4188	NASDAQ	CERS	Thu, Sep 26, 2013	5.82	6.09	5.79	6.05
4187	NASDAQ	CERS	Wed, Sep 25, 2013	5.86	5.89	5.72	5.82
4186	NASDAQ	CERS	Tue, Sep 24, 2013	5.98	6.01	5.81	5.83
4185	NASDAQ	CERS	Mon, Sep 23, 2013	6.01	6.06	5.86	5.99
4184	NASDAQ	CERS	Fri, Sep 20, 2013	5.89	6.07	5.87	5.99
4183	NASDAQ	CERS	Thu, Sep 19, 2013	5.75	5.94	5.66	5.88
4182	NASDAQ	CERS	Wed, Sep 18, 2013	5.75	5.79	5.66	5.75
4181	NASDAQ	CERS	Tue, Sep 17, 2013	5.54	5.80	5.54	5.75
4180	NASDAQ	CERS	Mon, Sep 16, 2013	5.69	5.73	5.54	5.56
4179	NASDAQ	CERS	Fri, Sep 13, 2013	5.71	5.71	5.60	5.64
4178	NASDAQ	CERS	Thu, Sep 12, 2013	5.69	5.72	5.61	5.68
4177	NASDAQ	CERS	Wed, Sep 11, 2013	5.74	5.80	5.66	5.70
4176	NASDAQ	CERS	Tue, Sep 10, 2013	5.80	5.85	5.75	5.76
4175	NASDAQ	CERS	Mon, Sep 9, 2013	5.65	5.82	5.65	5.79
4174	NASDAQ	CERS	Fri, Sep 6, 2013	5.74	5.78	5.51	5.62
4173	NASDAQ	CERS	Thu, Sep 5, 2013	5.77	5.82	5.68	5.69
4172	NASDAQ	CERS	Wed, Sep 4, 2013	5.65	5.84	5.65	5.77
4171	NASDAQ	CERS	Tue, Sep 3, 2013	5.32	5.69	5.26	5.62
4170	NASDAQ	CERS	Fri, Aug 30, 2013	5.22	5.27	5.20	5.23
4169	NASDAQ	CERS	Thu, Aug 29, 2013	5.24	5.40	5.23	5.24
4168	NASDAQ	CERS	Wed, Aug 28, 2013	5.29	5.41	5.19	5.24
4167	NASDAQ	CERS	Tue, Aug 27, 2013	5.37	5.41	5.26	5.30
4166	NASDAQ	CERS	Mon, Aug 26, 2013	5.26	5.49	5.26	5.42
4165	NASDAQ	CERS	Fri, Aug 23, 2013	5.39	5.41	5.17	5.26
4164	NASDAQ	CERS	Thu, Aug 22, 2013	5.35	5.45	5.30	5.39
4163	NASDAQ	CERS	Wed, Aug 21, 2013	5.47	5.52	5.26	5.29
4162	NASDAQ	CERS	Tue, Aug 20, 2013	5.48	5.55	5.43	5.47
4161	NASDAQ	CERS	Mon, Aug 19, 2013	5.43	5.50	5.34	5.44
4160	NASDAQ	CERS	Fri, Aug 16, 2013	5.41	5.45	5.33	5.37
4159	NASDAQ	CERS	Thu, Aug 15, 2013	5.62	5.62	5.42	5.46
4158	NASDAQ	CERS	Wed, Aug 14, 2013	5.69	5.77	5.63	5.67
4157	NASDAQ	CERS	Tue, Aug 13, 2013	5.76	5.81	5.66	5.69
4156	NASDAQ	CERS	Mon, Aug 12, 2013	5.70	5.78	5.60	5.74
4155	NASDAQ	CERS	Fri, Aug 9, 2013	5.73	5.81	5.63	5.74
4154	NASDAQ	CERS	Thu, Aug 8, 2013	5.85	5.97	5.71	5.77
4153	NASDAQ	CERS	Wed, Aug 7, 2013	5.83	5.85	5.69	5.78
4152	NASDAQ	CERS	Tue, Aug 6, 2013	5.98	5.98	5.80	5.86
4151	NASDAQ	CERS	Mon, Aug 5, 2013	5.82	6.00	5.74	5.92
4150	NASDAQ	CERS	Fri, Aug 2, 2013	5.64	5.89	5.53	5.80
4149	NASDAQ	CERS	Thu, Aug 1, 2013	5.65	5.66	5.55	5.66
4148	NASDAQ	CERS	Wed, Jul 31, 2013	5.45	5.64	5.20	5.60
4147	NASDAQ	CERS	Tue, Jul 30, 2013	5.30	5.50	5.24	5.43
4146	NASDAQ	CERS	Mon, Jul 29, 2013	5.30	5.32	5.19	5.25
4145	NASDAQ	CERS	Fri, Jul 26, 2013	5.17	5.32	5.09	5.31
4144	NASDAQ	CERS	Thu, Jul 25, 2013	5.26	5.36	5.19	5.20
4143	NASDAQ	CERS	Wed, Jul 24, 2013	5.45	5.51	5.22	5.26
4142	NASDAQ	CERS	Tue, Jul 23, 2013	5.27	5.46	5.25	5.41
4141	NASDAQ	CERS	Mon, Jul 22, 2013	5.20	5.30	5.16	5.26
4140	NASDAQ	CERS	Fri, Jul 19, 2013	5.15	5.22	5.08	5.18
4139	NASDAQ	CERS	Thu, Jul 18, 2013	5.17	5.34	5.00	5.18
4138	NASDAQ	CERS	Wed, Jul 17, 2013	5.08	5.18	5.01	5.14
4137	NASDAQ	CERS	Tue, Jul 16, 2013	5.03	5.11	5.00	5.04
4136	NASDAQ	CERS	Mon, Jul 15, 2013	4.91	5.14	4.90	5.03
4135	NASDAQ	CERS	Fri, Jul 12, 2013	4.63	4.98	4.63	4.90
4134	NASDAQ	CERS	Thu, Jul 11, 2013	4.57	4.68	4.51	4.62
4133	NASDAQ	CERS	Wed, Jul 10, 2013	4.50	4.62	4.43	4.51
4132	NASDAQ	CERS	Tue, Jul 9, 2013	4.46	4.76	4.45	4.49
4131	NASDAQ	CERS	Mon, Jul 8, 2013	4.42	4.51	4.35	4.45
4130	NASDAQ	CERS	Fri, Jul 5, 2013	4.47	4.48	4.34	4.40
4129	NASDAQ	CERS	Wed, Jul 3, 2013	4.46	4.54	4.37	4.39
4128	NASDAQ	CERS	Tue, Jul 2, 2013	4.45	4.60	4.45	4.50
4127	NASDAQ	CERS	Mon, Jul 1, 2013	4.41	4.59	4.41	4.47
4126	NASDAQ	CERS	Fri, Jun 28, 2013	4.44	4.48	4.31	4.42
4125	NASDAQ	CERS	Thu, Jun 27, 2013	4.42	4.47	4.36	4.46
4124	NASDAQ	CERS	Wed, Jun 26, 2013	4.42	4.51	4.34	4.39
4123	NASDAQ	CERS	Tue, Jun 25, 2013	4.52	4.52	4.29	4.32
4122	NASDAQ	CERS	Mon, Jun 24, 2013	4.42	4.55	4.35	4.50
4121	NASDAQ	CERS	Fri, Jun 21, 2013	4.41	4.57	4.40	4.45
4120	NASDAQ	CERS	Thu, Jun 20, 2013	4.35	4.50	4.29	4.39
4119	NASDAQ	CERS	Wed, Jun 19, 2013	4.54	4.55	4.39	4.40
4118	NASDAQ	CERS	Tue, Jun 18, 2013	4.55	4.61	4.51	4.55
4117	NASDAQ	CERS	Mon, Jun 17, 2013	4.59	4.60	4.48	4.55
4116	NASDAQ	CERS	Fri, Jun 14, 2013	4.76	4.83	4.54	4.55
4115	NASDAQ	CERS	Thu, Jun 13, 2013	4.68	4.79	4.16	4.75
4114	NASDAQ	CERS	Wed, Jun 12, 2013	4.84	4.86	4.63	4.67
4113	NASDAQ	CERS	Tue, Jun 11, 2013	4.85	4.92	4.80	4.84
4112	NASDAQ	CERS	Mon, Jun 10, 2013	4.78	4.91	4.78	4.91
4111	NASDAQ	CERS	Fri, Jun 7, 2013	4.99	5.05	4.82	4.82
4110	NASDAQ	CERS	Thu, Jun 6, 2013	4.89	5.03	4.75	4.99
4109	NASDAQ	CERS	Wed, Jun 5, 2013	5.24	5.26	4.89	4.91
4108	NASDAQ	CERS	Tue, Jun 4, 2013	5.31	5.42	5.18	5.26
4107	NASDAQ	CERS	Mon, Jun 3, 2013	5.14	5.40	5.06	5.31
4106	NASDAQ	CERS	Fri, May 31, 2013	5.15	5.32	5.11	5.14
4105	NASDAQ	CERS	Thu, May 30, 2013	5.21	5.26	5.13	5.17
4104	NASDAQ	CERS	Wed, May 29, 2013	5.34	5.40	5.22	5.24
4103	NASDAQ	CERS	Tue, May 28, 2013	5.19	5.50	5.19	5.38
4102	NASDAQ	CERS	Fri, May 24, 2013	5.05	5.19	5.05	5.16
4101	NASDAQ	CERS	Thu, May 23, 2013	5.17	5.26	5.05	5.12
4100	NASDAQ	CERS	Wed, May 22, 2013	5.41	5.58	5.22	5.24
4099	NASDAQ	CERS	Tue, May 21, 2013	5.33	5.47	5.26	5.41
4098	NASDAQ	CERS	Mon, May 20, 2013	5.56	5.58	5.27	5.37
4097	NASDAQ	CERS	Fri, May 17, 2013	5.35	5.57	5.31	5.48
4096	NASDAQ	CERS	Thu, May 16, 2013	5.16	5.38	5.12	5.35
4095	NASDAQ	CERS	Wed, May 15, 2013	5.13	5.20	5.06	5.17
4094	NASDAQ	CERS	Tue, May 14, 2013	4.96	5.15	4.96	5.13
4093	NASDAQ	CERS	Mon, May 13, 2013	4.84	5.01	4.82	4.97
4092	NASDAQ	CERS	Fri, May 10, 2013	4.79	4.85	4.72	4.84
4091	NASDAQ	CERS	Thu, May 9, 2013	4.77	4.82	4.73	4.80
4090	NASDAQ	CERS	Wed, May 8, 2013	4.69	4.83	4.65	4.79
4089	NASDAQ	CERS	Tue, May 7, 2013	4.70	4.75	4.63	4.69
4088	NASDAQ	CERS	Mon, May 6, 2013	4.76	4.82	4.70	4.76
4087	NASDAQ	CERS	Fri, May 3, 2013	4.88	4.97	4.77	4.78
4086	NASDAQ	CERS	Thu, May 2, 2013	4.86	4.94	4.77	4.85
4085	NASDAQ	CERS	Wed, May 1, 2013	5.22	5.37	4.79	4.82
4084	NASDAQ	CERS	Tue, Apr 30, 2013	5.36	5.39	5.26	5.32
4083	NASDAQ	CERS	Mon, Apr 29, 2013	5.30	5.43	5.30	5.34
4082	NASDAQ	CERS	Fri, Apr 26, 2013	5.19	5.39	5.10	5.30
4081	NASDAQ	CERS	Thu, Apr 25, 2013	5.25	5.30	5.16	5.21
4080	NASDAQ	CERS	Wed, Apr 24, 2013	5.15	5.35	5.04	5.22
4079	NASDAQ	CERS	Tue, Apr 23, 2013	4.70	4.94	4.70	4.94
4078	NASDAQ	CERS	Mon, Apr 22, 2013	4.84	4.94	4.67	4.69
4077	NASDAQ	CERS	Fri, Apr 19, 2013	4.73	5.00	4.69	4.80
4076	NASDAQ	CERS	Thu, Apr 18, 2013	4.72	4.82	4.64	4.74
4075	NASDAQ	CERS	Wed, Apr 17, 2013	4.79	4.79	4.62	4.70
4074	NASDAQ	CERS	Tue, Apr 16, 2013	4.79	4.88	4.69	4.81
4073	NASDAQ	CERS	Mon, Apr 15, 2013	4.98	4.99	4.74	4.77
4072	NASDAQ	CERS	Fri, Apr 12, 2013	4.82	5.09	4.80	5.01
4071	NASDAQ	CERS	Thu, Apr 11, 2013	4.55	5.18	4.50	4.85
4070	NASDAQ	CERS	Wed, Apr 10, 2013	4.38	4.60	4.37	4.54
4069	NASDAQ	CERS	Tue, Apr 9, 2013	4.37	4.45	4.32	4.38
4068	NASDAQ	CERS	Mon, Apr 8, 2013	4.35	4.43	4.32	4.35
4067	NASDAQ	CERS	Fri, Apr 5, 2013	4.28	4.38	4.28	4.35
4066	NASDAQ	CERS	Thu, Apr 4, 2013	4.33	4.37	4.30	4.35
4065	NASDAQ	CERS	Wed, Apr 3, 2013	4.29	4.35	4.25	4.31
4064	NASDAQ	CERS	Tue, Apr 2, 2013	4.38	4.43	4.29	4.30
4063	NASDAQ	CERS	Mon, Apr 1, 2013	4.39	4.40	4.25	4.35
4062	NASDAQ	CERS	Thu, Mar 28, 2013	4.46	4.48	4.30	4.42
4061	NASDAQ	CERS	Wed, Mar 27, 2013	4.33	4.44	4.18	4.42
4060	NASDAQ	CERS	Tue, Mar 26, 2013	4.43	4.46	4.26	4.34
4059	NASDAQ	CERS	Mon, Mar 25, 2013	4.48	4.54	4.37	4.40
4058	NASDAQ	CERS	Fri, Mar 22, 2013	4.48	4.50	4.43	4.48
4057	NASDAQ	CERS	Thu, Mar 21, 2013	4.42	4.50	4.38	4.44
4056	NASDAQ	CERS	Wed, Mar 20, 2013	4.48	4.53	4.34	4.47
4055	NASDAQ	CERS	Tue, Mar 19, 2013	4.35	4.48	4.33	4.46
4054	NASDAQ	CERS	Mon, Mar 18, 2013	4.44	4.45	4.34	4.36
4053	NASDAQ	CERS	Fri, Mar 15, 2013	4.42	4.55	4.37	4.48
4052	NASDAQ	CERS	Thu, Mar 14, 2013	4.32	4.43	4.25	4.42
4051	NASDAQ	CERS	Wed, Mar 13, 2013	4.15	4.23	4.12	4.20
4050	NASDAQ	CERS	Tue, Mar 12, 2013	4.24	4.29	4.06	4.16
4049	NASDAQ	CERS	Mon, Mar 11, 2013	4.21	4.27	4.19	4.26
4048	NASDAQ	CERS	Fri, Mar 8, 2013	4.20	4.25	4.19	4.23
4047	NASDAQ	CERS	Thu, Mar 7, 2013	4.05	4.22	4.01	4.20
4046	NASDAQ	CERS	Wed, Mar 6, 2013	3.97	4.08	3.86	4.07
4045	NASDAQ	CERS	Tue, Mar 5, 2013	3.95	4.04	3.90	4.00
4044	NASDAQ	CERS	Mon, Mar 4, 2013	3.66	3.95	3.63	3.95
4043	NASDAQ	CERS	Fri, Mar 1, 2013	3.49	3.69	3.40	3.66
4042	NASDAQ	CERS	Thu, Feb 28, 2013	3.22	3.29	3.15	3.29
4041	NASDAQ	CERS	Wed, Feb 27, 2013	3.16	3.21	3.15	3.21
4040	NASDAQ	CERS	Tue, Feb 26, 2013	3.16	3.22	3.13	3.17
4039	NASDAQ	CERS	Mon, Feb 25, 2013	3.20	3.22	3.15	3.16
4038	NASDAQ	CERS	Fri, Feb 22, 2013	3.19	3.20	3.15	3.19
4037	NASDAQ	CERS	Thu, Feb 21, 2013	3.15	3.17	3.15	3.16
4036	NASDAQ	CERS	Wed, Feb 20, 2013	3.14	3.19	3.14	3.15
4035	NASDAQ	CERS	Tue, Feb 19, 2013	3.13	3.20	3.10	3.17
4034	NASDAQ	CERS	Fri, Feb 15, 2013	3.18	3.18	3.13	3.15
4033	NASDAQ	CERS	Thu, Feb 14, 2013	3.03	3.18	3.03	3.14
4032	NASDAQ	CERS	Wed, Feb 13, 2013	3.04	3.05	2.98	3.01
4031	NASDAQ	CERS	Tue, Feb 12, 2013	3.10	3.11	3.02	3.04
4030	NASDAQ	CERS	Mon, Feb 11, 2013	3.12	3.18	3.10	3.10
4029	NASDAQ	CERS	Fri, Feb 8, 2013	3.16	3.16	3.11	3.12
4028	NASDAQ	CERS	Thu, Feb 7, 2013	3.17	3.18	3.11	3.16
4027	NASDAQ	CERS	Wed, Feb 6, 2013	3.12	3.18	3.08	3.18
4026	NASDAQ	CERS	Tue, Feb 5, 2013	3.12	3.15	3.09	3.15
4025	NASDAQ	CERS	Mon, Feb 4, 2013	3.13	3.17	3.07	3.10
4024	NASDAQ	CERS	Fri, Feb 1, 2013	3.17	3.18	3.09	3.16
4023	NASDAQ	CERS	Thu, Jan 31, 2013	3.13	3.20	3.13	3.17
4022	NASDAQ	CERS	Wed, Jan 30, 2013	3.18	3.21	3.10	3.14
4021	NASDAQ	CERS	Tue, Jan 29, 2013	3.07	3.20	3.07	3.19
4020	NASDAQ	CERS	Mon, Jan 28, 2013	2.99	3.09	2.99	3.08
4019	NASDAQ	CERS	Fri, Jan 25, 2013	3.01	3.04	2.99	3.00
4018	NASDAQ	CERS	Thu, Jan 24, 2013	3.05	3.08	3.00	3.01
4017	NASDAQ	CERS	Wed, Jan 23, 2013	3.02	3.05	3.01	3.04
4016	NASDAQ	CERS	Tue, Jan 22, 2013	3.01	3.04	3.00	3.03
4015	NASDAQ	CERS	Fri, Jan 18, 2013	3.07	3.07	3.01	3.03
4014	NASDAQ	CERS	Thu, Jan 17, 2013	3.07	3.07	3.04	3.06
4013	NASDAQ	CERS	Wed, Jan 16, 2013	3.05	3.08	3.00	3.07
4012	NASDAQ	CERS	Tue, Jan 15, 2013	3.06	3.10	3.04	3.05
4011	NASDAQ	CERS	Mon, Jan 14, 2013	3.06	3.11	3.05	3.09
4010	NASDAQ	CERS	Fri, Jan 11, 2013	3.10	3.10	3.05	3.08
4009	NASDAQ	CERS	Thu, Jan 10, 2013	3.10	3.14	3.01	3.10
4008	NASDAQ	CERS	Wed, Jan 9, 2013	3.10	3.10	3.00	3.09
4007	NASDAQ	CERS	Tue, Jan 8, 2013	2.98	3.08	2.98	3.06
4006	NASDAQ	CERS	Mon, Jan 7, 2013	2.97	3.00	2.90	2.95
4005	NASDAQ	CERS	Fri, Jan 4, 2013	3.09	3.14	2.98	3.00
4004	NASDAQ	CERS	Thu, Jan 3, 2013	3.20	3.21	3.07	3.08
4003	NASDAQ	CERS	Wed, Jan 2, 2013	3.24	3.24	3.16	3.19
4002	NASDAQ	CERS	Mon, Dec 31, 2012	3.10	3.18	3.05	3.16
4001	NASDAQ	CERS	Fri, Dec 28, 2012	3.12	3.19	3.06	3.11
4000	NASDAQ	CERS	Thu, Dec 27, 2012	3.19	3.26	3.09	3.14
3999	NASDAQ	CERS	Wed, Dec 26, 2012	3.25	3.31	3.18	3.20
3998	NASDAQ	CERS	Mon, Dec 24, 2012	3.30	3.30	3.22	3.25
3997	NASDAQ	CERS	Fri, Dec 21, 2012	3.38	3.38	3.20	3.30
3996	NASDAQ	CERS	Thu, Dec 20, 2012	3.40	3.40	3.31	3.38
3995	NASDAQ	CERS	Wed, Dec 19, 2012	3.33	3.40	3.30	3.39
3994	NASDAQ	CERS	Tue, Dec 18, 2012	3.30	3.36	3.28	3.31
3993	NASDAQ	CERS	Mon, Dec 17, 2012	3.30	3.32	3.26	3.30
3992	NASDAQ	CERS	Fri, Dec 14, 2012	3.28	3.34	3.26	3.28
3991	NASDAQ	CERS	Thu, Dec 13, 2012	3.18	3.35	3.16	3.30
3990	NASDAQ	CERS	Wed, Dec 12, 2012	3.19	3.23	3.16	3.19
3989	NASDAQ	CERS	Tue, Dec 11, 2012	3.16	3.18	3.07	3.17
3988	NASDAQ	CERS	Mon, Dec 10, 2012	3.14	3.17	3.11	3.15
3987	NASDAQ	CERS	Fri, Dec 7, 2012	3.17	3.17	3.08	3.13
3986	NASDAQ	CERS	Thu, Dec 6, 2012	3.15	3.19	3.12	3.15
3985	NASDAQ	CERS	Wed, Dec 5, 2012	3.22	3.22	3.06	3.16
3984	NASDAQ	CERS	Tue, Dec 4, 2012	3.19	3.24	3.18	3.20
3983	NASDAQ	CERS	Mon, Dec 3, 2012	3.24	3.29	3.19	3.20
3982	NASDAQ	CERS	Fri, Nov 30, 2012	3.22	3.28	3.16	3.23
3981	NASDAQ	CERS	Thu, Nov 29, 2012	3.24	3.25	3.07	3.21
3980	NASDAQ	CERS	Wed, Nov 28, 2012	3.13	3.22	3.10	3.22
3979	NASDAQ	CERS	Tue, Nov 27, 2012	3.18	3.23	3.15	3.16
3978	NASDAQ	CERS	Mon, Nov 26, 2012	3.15	3.20	3.11	3.17
3977	NASDAQ	CERS	Fri, Nov 23, 2012	3.06	3.17	3.06	3.15
3976	NASDAQ	CERS	Wed, Nov 21, 2012	3.08	3.15	3.06	3.08
3975	NASDAQ	CERS	Tue, Nov 20, 2012	3.05	3.15	3.01	3.06
3974	NASDAQ	CERS	Mon, Nov 19, 2012	2.90	3.13	2.90	3.05
3973	NASDAQ	CERS	Fri, Nov 16, 2012	2.85	2.91	2.68	2.85
3972	NASDAQ	CERS	Thu, Nov 15, 2012	3.02	3.05	2.84	2.87
3971	NASDAQ	CERS	Wed, Nov 14, 2012	3.05	3.07	2.98	3.00
3970	NASDAQ	CERS	Tue, Nov 13, 2012	3.04	3.10	3.03	3.03
3969	NASDAQ	CERS	Mon, Nov 12, 2012	3.12	3.14	3.03	3.05
3968	NASDAQ	CERS	Fri, Nov 9, 2012	3.10	3.14	3.08	3.09
3967	NASDAQ	CERS	Thu, Nov 8, 2012	3.00	3.20	2.97	3.10
3966	NASDAQ	CERS	Wed, Nov 7, 2012	3.12	3.13	3.01	3.01
3965	NASDAQ	CERS	Tue, Nov 6, 2012	3.18	3.22	3.10	3.16
3964	NASDAQ	CERS	Mon, Nov 5, 2012	3.01	3.19	3.01	3.18
3963	NASDAQ	CERS	Fri, Nov 2, 2012	3.15	3.16	3.01	3.01
3962	NASDAQ	CERS	Thu, Nov 1, 2012	3.11	3.18	3.09	3.15
3961	NASDAQ	CERS	Wed, Oct 31, 2012	3.23	3.23	3.10	3.10
3960	NASDAQ	CERS	Fri, Oct 26, 2012	3.12	3.21	3.10	3.17
3959	NASDAQ	CERS	Thu, Oct 25, 2012	3.15	3.19	3.09	3.11
3958	NASDAQ	CERS	Wed, Oct 24, 2012	3.30	3.32	3.09	3.12
3957	NASDAQ	CERS	Tue, Oct 23, 2012	3.19	3.37	3.13	3.32
3956	NASDAQ	CERS	Mon, Oct 22, 2012	3.30	3.32	3.19	3.19
3955	NASDAQ	CERS	Fri, Oct 19, 2012	3.29	3.31	3.25	3.30
3954	NASDAQ	CERS	Thu, Oct 18, 2012	3.36	3.38	3.29	3.32
3953	NASDAQ	CERS	Wed, Oct 17, 2012	3.39	3.42	3.35	3.36
3952	NASDAQ	CERS	Tue, Oct 16, 2012	3.46	3.48	3.38	3.39
3951	NASDAQ	CERS	Mon, Oct 15, 2012	3.40	3.45	3.39	3.43
3950	NASDAQ	CERS	Fri, Oct 12, 2012	3.41	3.46	3.39	3.40
3949	NASDAQ	CERS	Thu, Oct 11, 2012	3.45	3.49	3.40	3.42
3948	NASDAQ	CERS	Wed, Oct 10, 2012	3.40	3.46	3.38	3.43
3947	NASDAQ	CERS	Tue, Oct 9, 2012	3.49	3.52	3.38	3.40
3946	NASDAQ	CERS	Mon, Oct 8, 2012	3.47	3.49	3.40	3.44
3945	NASDAQ	CERS	Fri, Oct 5, 2012	3.44	3.47	3.32	3.36
3944	NASDAQ	CERS	Thu, Oct 4, 2012	3.41	3.45	3.36	3.42
3943	NASDAQ	CERS	Wed, Oct 3, 2012	3.42	3.45	3.38	3.40
3942	NASDAQ	CERS	Tue, Oct 2, 2012	3.43	3.43	3.39	3.41
3941	NASDAQ	CERS	Mon, Oct 1, 2012	3.40	3.43	3.37	3.42
3940	NASDAQ	CERS	Fri, Sep 28, 2012	3.40	3.47	3.38	3.40
3939	NASDAQ	CERS	Thu, Sep 27, 2012	3.40	3.43	3.36	3.40
3938	NASDAQ	CERS	Wed, Sep 26, 2012	3.38	3.40	3.30	3.39
3937	NASDAQ	CERS	Tue, Sep 25, 2012	3.43	3.46	3.36	3.38
3936	NASDAQ	CERS	Mon, Sep 24, 2012	3.46	3.49	3.42	3.45
3935	NASDAQ	CERS	Fri, Sep 21, 2012	3.45	3.54	3.40	3.46
3934	NASDAQ	CERS	Thu, Sep 20, 2012	3.43	3.49	3.40	3.44
3933	NASDAQ	CERS	Wed, Sep 19, 2012	3.44	3.45	3.40	3.44
3932	NASDAQ	CERS	Tue, Sep 18, 2012	3.41	3.45	3.40	3.43
3931	NASDAQ	CERS	Mon, Sep 17, 2012	3.40	3.44	3.35	3.42
3930	NASDAQ	CERS	Fri, Sep 14, 2012	3.41	3.45	3.39	3.42
3929	NASDAQ	CERS	Thu, Sep 13, 2012	3.37	3.45	3.32	3.41
3928	NASDAQ	CERS	Wed, Sep 12, 2012	3.44	3.44	3.30	3.36
3927	NASDAQ	CERS	Tue, Sep 11, 2012	3.48	3.61	3.40	3.44
3926	NASDAQ	CERS	Mon, Sep 10, 2012	3.34	3.42	3.31	3.40
3925	NASDAQ	CERS	Fri, Sep 7, 2012	3.37	3.39	3.30	3.32
3924	NASDAQ	CERS	Thu, Sep 6, 2012	3.32	3.39	3.29	3.35
3923	NASDAQ	CERS	Wed, Sep 5, 2012	3.22	3.33	3.22	3.29
3922	NASDAQ	CERS	Tue, Sep 4, 2012	3.19	3.30	3.18	3.25
3921	NASDAQ	CERS	Fri, Aug 31, 2012	3.24	3.27	3.19	3.19
3920	NASDAQ	CERS	Thu, Aug 30, 2012	3.22	3.26	3.17	3.21
3919	NASDAQ	CERS	Wed, Aug 29, 2012	3.21	3.29	3.16	3.24
3918	NASDAQ	CERS	Tue, Aug 28, 2012	3.18	3.25	3.15	3.22
3917	NASDAQ	CERS	Mon, Aug 27, 2012	3.20	3.20	3.16	3.19
3916	NASDAQ	CERS	Fri, Aug 24, 2012	3.17	3.21	3.14	3.20
3915	NASDAQ	CERS	Thu, Aug 23, 2012	3.26	3.27	3.17	3.19
3914	NASDAQ	CERS	Wed, Aug 22, 2012	3.22	3.28	3.18	3.24
3913	NASDAQ	CERS	Tue, Aug 21, 2012	3.28	3.31	3.20	3.21
3912	NASDAQ	CERS	Mon, Aug 20, 2012	3.28	3.36	3.25	3.26
3911	NASDAQ	CERS	Fri, Aug 17, 2012	3.24	3.32	3.24	3.28
3910	NASDAQ	CERS	Thu, Aug 16, 2012	3.24	3.33	3.24	3.26
3909	NASDAQ	CERS	Wed, Aug 15, 2012	3.30	3.34	3.20	3.23
3908	NASDAQ	CERS	Tue, Aug 14, 2012	3.20	3.27	3.19	3.24
3907	NASDAQ	CERS	Mon, Aug 13, 2012	3.14	3.19	3.11	3.19
3906	NASDAQ	CERS	Fri, Aug 10, 2012	3.19	3.20	3.10	3.15
3905	NASDAQ	CERS	Thu, Aug 9, 2012	3.21	3.22	3.17	3.20
3904	NASDAQ	CERS	Wed, Aug 8, 2012	3.25	3.31	3.20	3.23
3903	NASDAQ	CERS	Tue, Aug 7, 2012	3.17	3.32	3.15	3.29
3902	NASDAQ	CERS	Mon, Aug 6, 2012	3.20	3.25	3.15	3.16
3901	NASDAQ	CERS	Fri, Aug 3, 2012	3.12	3.28	3.11	3.21
3900	NASDAQ	CERS	Thu, Aug 2, 2012	3.04	3.14	3.01	3.07
3899	NASDAQ	CERS	Wed, Aug 1, 2012	3.05	3.15	3.00	3.00
3898	NASDAQ	CERS	Tue, Jul 31, 2012	3.18	3.24	3.00	3.02
3897	NASDAQ	CERS	Mon, Jul 30, 2012	3.21	3.27	3.16	3.19
3896	NASDAQ	CERS	Fri, Jul 27, 2012	3.11	3.23	3.09	3.21
3895	NASDAQ	CERS	Thu, Jul 26, 2012	3.08	3.12	3.05	3.10
3894	NASDAQ	CERS	Wed, Jul 25, 2012	3.05	3.09	3.01	3.05
3893	NASDAQ	CERS	Tue, Jul 24, 2012	3.04	3.08	3.00	3.03
3892	NASDAQ	CERS	Mon, Jul 23, 2012	3.15	3.15	3.02	3.03
3891	NASDAQ	CERS	Fri, Jul 20, 2012	3.43	3.47	3.14	3.18
3890	NASDAQ	CERS	Thu, Jul 19, 2012	3.54	3.56	3.46	3.46
3889	NASDAQ	CERS	Wed, Jul 18, 2012	3.61	3.63	3.51	3.52
3888	NASDAQ	CERS	Tue, Jul 17, 2012	3.56	3.78	3.56	3.60
3887	NASDAQ	CERS	Mon, Jul 16, 2012	3.54	3.62	3.53	3.55
3886	NASDAQ	CERS	Fri, Jul 13, 2012	3.57	3.60	3.47	3.51
3885	NASDAQ	CERS	Thu, Jul 12, 2012	3.45	3.63	3.43	3.57
3884	NASDAQ	CERS	Wed, Jul 11, 2012	3.49	3.51	3.40	3.48
3883	NASDAQ	CERS	Tue, Jul 10, 2012	3.50	3.56	3.47	3.49
3882	NASDAQ	CERS	Mon, Jul 9, 2012	3.55	3.60	3.47	3.49
3881	NASDAQ	CERS	Fri, Jul 6, 2012	3.46	3.59	3.42	3.56
3880	NASDAQ	CERS	Thu, Jul 5, 2012	3.52	3.58	3.49	3.51
3879	NASDAQ	CERS	Tue, Jul 3, 2012	3.47	3.56	3.44	3.52
3878	NASDAQ	CERS	Mon, Jul 2, 2012	3.32	3.46	3.31	3.44
3877	NASDAQ	CERS	Fri, Jun 29, 2012	3.29	3.37	3.20	3.32
3876	NASDAQ	CERS	Thu, Jun 28, 2012	3.20	3.29	3.19	3.23
3875	NASDAQ	CERS	Wed, Jun 27, 2012	3.27	3.27	3.13	3.22
3874	NASDAQ	CERS	Tue, Jun 26, 2012	3.27	3.33	3.18	3.27
3873	NASDAQ	CERS	Mon, Jun 25, 2012	3.30	3.30	3.18	3.27
3872	NASDAQ	CERS	Fri, Jun 22, 2012	3.32	3.41	3.32	3.35
3871	NASDAQ	CERS	Thu, Jun 21, 2012	3.37	3.40	3.30	3.31
3870	NASDAQ	CERS	Wed, Jun 20, 2012	3.36	3.38	3.29	3.37
3869	NASDAQ	CERS	Tue, Jun 19, 2012	3.31	3.46	3.30	3.35
3868	NASDAQ	CERS	Mon, Jun 18, 2012	3.23	3.33	3.19	3.28
3867	NASDAQ	CERS	Fri, Jun 15, 2012	3.24	3.27	3.22	3.24
3866	NASDAQ	CERS	Thu, Jun 14, 2012	3.26	3.31	3.17	3.24
3865	NASDAQ	CERS	Wed, Jun 13, 2012	3.20	3.34	3.20	3.25
3864	NASDAQ	CERS	Tue, Jun 12, 2012	3.18	3.23	3.13	3.20
3863	NASDAQ	CERS	Mon, Jun 11, 2012	3.25	3.25	3.15	3.17
3862	NASDAQ	CERS	Fri, Jun 8, 2012	3.27	3.29	3.13	3.21
3861	NASDAQ	CERS	Thu, Jun 7, 2012	3.33	3.37	3.13	3.28
3860	NASDAQ	CERS	Wed, Jun 6, 2012	3.29	3.47	3.24	3.28
3859	NASDAQ	CERS	Tue, Jun 5, 2012	3.27	3.40	3.20	3.27
3858	NASDAQ	CERS	Mon, Jun 4, 2012	3.23	3.28	3.18	3.27
3857	NASDAQ	CERS	Fri, Jun 1, 2012	3.30	3.40	3.00	3.20
3856	NASDAQ	CERS	Thu, May 31, 2012	3.47	3.47	3.35	3.38
3855	NASDAQ	CERS	Wed, May 30, 2012	3.50	3.51	3.44	3.46
3854	NASDAQ	CERS	Tue, May 29, 2012	3.53	3.58	3.45	3.52
3853	NASDAQ	CERS	Fri, May 25, 2012	3.56	3.62	3.46	3.49
3852	NASDAQ	CERS	Thu, May 24, 2012	3.52	3.58	3.49	3.55
3851	NASDAQ	CERS	Wed, May 23, 2012	3.47	3.56	3.32	3.52
3850	NASDAQ	CERS	Tue, May 22, 2012	3.54	3.63	3.49	3.51
3849	NASDAQ	CERS	Mon, May 21, 2012	3.37	3.57	3.36	3.55
3848	NASDAQ	CERS	Fri, May 18, 2012	3.47	3.47	3.28	3.38
3847	NASDAQ	CERS	Thu, May 17, 2012	3.63	3.63	3.46	3.46
3846	NASDAQ	CERS	Wed, May 16, 2012	3.73	3.77	3.55	3.61
3845	NASDAQ	CERS	Tue, May 15, 2012	3.69	3.83	3.67	3.72
3844	NASDAQ	CERS	Mon, May 14, 2012	3.64	3.73	3.63	3.70
3843	NASDAQ	CERS	Fri, May 11, 2012	3.54	3.67	3.50	3.66
3842	NASDAQ	CERS	Thu, May 10, 2012	3.63	3.65	3.55	3.57
3841	NASDAQ	CERS	Wed, May 9, 2012	3.63	3.68	3.61	3.61
3840	NASDAQ	CERS	Tue, May 8, 2012	3.64	3.71	3.63	3.67
3839	NASDAQ	CERS	Mon, May 7, 2012	3.65	3.74	3.62	3.64
3838	NASDAQ	CERS	Fri, May 4, 2012	3.70	3.73	3.65	3.65
3837	NASDAQ	CERS	Thu, May 3, 2012	3.75	3.81	3.67	3.72
3836	NASDAQ	CERS	Wed, May 2, 2012	3.76	3.90	3.75	3.77
3835	NASDAQ	CERS	Tue, May 1, 2012	3.94	3.97	3.72	3.83
3834	NASDAQ	CERS	Mon, Apr 30, 2012	4.02	4.06	3.91	3.94
3833	NASDAQ	CERS	Fri, Apr 27, 2012	4.01	4.06	3.95	4.04
3832	NASDAQ	CERS	Thu, Apr 26, 2012	4.06	4.06	3.92	4.01
3831	NASDAQ	CERS	Wed, Apr 25, 2012	3.90	4.05	3.87	4.04
3830	NASDAQ	CERS	Tue, Apr 24, 2012	3.81	3.91	3.80	3.85
3829	NASDAQ	CERS	Mon, Apr 23, 2012	3.83	3.85	3.77	3.79
3828	NASDAQ	CERS	Fri, Apr 20, 2012	3.90	4.06	3.86	3.89
3827	NASDAQ	CERS	Thu, Apr 19, 2012	3.77	3.90	3.76	3.85
3826	NASDAQ	CERS	Wed, Apr 18, 2012	3.87	3.91	3.75	3.77
3825	NASDAQ	CERS	Tue, Apr 17, 2012	3.73	3.95	3.72	3.86
3824	NASDAQ	CERS	Mon, Apr 16, 2012	3.56	3.68	3.50	3.65
3823	NASDAQ	CERS	Fri, Apr 13, 2012	3.66	3.69	3.54	3.56
3822	NASDAQ	CERS	Thu, Apr 12, 2012	3.70	3.76	3.66	3.68
3821	NASDAQ	CERS	Wed, Apr 11, 2012	3.70	3.78	3.67	3.68
3820	NASDAQ	CERS	Tue, Apr 10, 2012	3.67	3.81	3.65	3.66
3819	NASDAQ	CERS	Mon, Apr 9, 2012	3.72	3.74	3.64	3.67
3818	NASDAQ	CERS	Thu, Apr 5, 2012	3.90	3.95	3.73	3.77
3817	NASDAQ	CERS	Wed, Apr 4, 2012	3.94	3.96	3.86	3.91
3816	NASDAQ	CERS	Tue, Apr 3, 2012	4.06	4.13	3.97	3.99
3815	NASDAQ	CERS	Mon, Apr 2, 2012	3.99	4.12	3.92	4.08
3814	NASDAQ	CERS	Fri, Mar 30, 2012	4.08	4.08	3.95	4.02
3813	NASDAQ	CERS	Thu, Mar 29, 2012	4.00	4.08	3.96	4.04
3812	NASDAQ	CERS	Wed, Mar 28, 2012	4.13	4.24	4.01	4.02
3811	NASDAQ	CERS	Tue, Mar 27, 2012	4.15	4.20	4.11	4.13
3810	NASDAQ	CERS	Mon, Mar 26, 2012	4.20	4.28	4.11	4.13
3809	NASDAQ	CERS	Fri, Mar 23, 2012	4.21	4.21	4.08	4.15
3808	NASDAQ	CERS	Thu, Mar 22, 2012	4.21	4.28	4.10	4.21
3807	NASDAQ	CERS	Wed, Mar 21, 2012	4.32	4.45	4.25	4.26
3806	NASDAQ	CERS	Tue, Mar 20, 2012	4.16	4.53	4.02	4.32
3805	NASDAQ	CERS	Mon, Mar 19, 2012	4.12	4.27	4.10	4.20
3804	NASDAQ	CERS	Fri, Mar 16, 2012	4.00	4.17	4.00	4.12
3803	NASDAQ	CERS	Thu, Mar 15, 2012	3.95	4.04	3.94	3.96
3802	NASDAQ	CERS	Wed, Mar 14, 2012	3.79	4.01	3.78	3.94
3801	NASDAQ	CERS	Tue, Mar 13, 2012	3.75	3.82	3.65	3.79
3800	NASDAQ	CERS	Mon, Mar 12, 2012	3.73	3.79	3.66	3.71
3799	NASDAQ	CERS	Fri, Mar 9, 2012	3.73	3.85	3.67	3.73
3798	NASDAQ	CERS	Thu, Mar 8, 2012	3.61	3.75	3.61	3.73
3797	NASDAQ	CERS	Wed, Mar 7, 2012	3.59	3.77	3.58	3.60
3796	NASDAQ	CERS	Tue, Mar 6, 2012	3.57	3.69	3.54	3.60
3795	NASDAQ	CERS	Mon, Mar 5, 2012	3.57	3.66	3.45	3.61
3794	NASDAQ	CERS	Fri, Mar 2, 2012	3.71	3.78	3.55	3.57
3793	NASDAQ	CERS	Thu, Mar 1, 2012	3.78	3.90	3.68	3.75
3792	NASDAQ	CERS	Wed, Feb 29, 2012	3.80	4.09	3.75	3.76
3791	NASDAQ	CERS	Tue, Feb 28, 2012	3.56	3.67	3.43	3.52
3790	NASDAQ	CERS	Mon, Feb 27, 2012	3.55	3.65	3.41	3.55
3789	NASDAQ	CERS	Fri, Feb 24, 2012	3.64	3.75	3.57	3.58
3788	NASDAQ	CERS	Thu, Feb 23, 2012	3.54	3.65	3.52	3.61
3787	NASDAQ	CERS	Wed, Feb 22, 2012	3.57	3.73	3.50	3.57
3786	NASDAQ	CERS	Tue, Feb 21, 2012	3.53	3.66	3.48	3.58
3785	NASDAQ	CERS	Fri, Feb 17, 2012	3.36	3.61	3.28	3.53
3784	NASDAQ	CERS	Thu, Feb 16, 2012	3.12	3.42	3.12	3.35
3783	NASDAQ	CERS	Wed, Feb 15, 2012	3.25	3.27	3.16	3.17
3782	NASDAQ	CERS	Tue, Feb 14, 2012	3.27	3.29	3.22	3.24
3781	NASDAQ	CERS	Mon, Feb 13, 2012	3.23	3.27	3.19	3.25
3780	NASDAQ	CERS	Fri, Feb 10, 2012	3.20	3.25	3.12	3.20
3779	NASDAQ	CERS	Thu, Feb 9, 2012	3.21	3.24	3.15	3.22
3778	NASDAQ	CERS	Wed, Feb 8, 2012	3.20	3.23	3.17	3.19
3777	NASDAQ	CERS	Tue, Feb 7, 2012	3.19	3.21	3.13	3.19
3776	NASDAQ	CERS	Mon, Feb 6, 2012	3.15	3.21	3.06	3.19
3775	NASDAQ	CERS	Fri, Feb 3, 2012	3.15	3.32	3.11	3.16
3774	NASDAQ	CERS	Thu, Feb 2, 2012	2.91	3.25	2.90	3.17
3773	NASDAQ	CERS	Wed, Feb 1, 2012	2.87	2.91	2.84	2.90
3772	NASDAQ	CERS	Tue, Jan 31, 2012	2.79	2.88	2.78	2.85
3771	NASDAQ	CERS	Mon, Jan 30, 2012	2.85	2.89	2.75	2.76
3770	NASDAQ	CERS	Fri, Jan 27, 2012	2.88	2.91	2.80	2.88
3769	NASDAQ	CERS	Thu, Jan 26, 2012	2.90	2.91	2.84	2.89
3768	NASDAQ	CERS	Wed, Jan 25, 2012	2.88	2.92	2.83	2.90
3767	NASDAQ	CERS	Tue, Jan 24, 2012	2.82	2.90	2.80	2.90
3766	NASDAQ	CERS	Mon, Jan 23, 2012	2.79	2.86	2.77	2.85
3765	NASDAQ	CERS	Fri, Jan 20, 2012	2.85	2.89	2.75	2.79
3764	NASDAQ	CERS	Thu, Jan 19, 2012	2.90	2.90	2.81	2.85
3763	NASDAQ	CERS	Wed, Jan 18, 2012	2.94	2.96	2.86	2.90
3762	NASDAQ	CERS	Tue, Jan 17, 2012	3.00	3.03	2.90	2.93
3761	NASDAQ	CERS	Fri, Jan 13, 2012	3.01	3.01	2.97	2.99
3760	NASDAQ	CERS	Thu, Jan 12, 2012	3.06	3.08	3.01	3.03
3759	NASDAQ	CERS	Wed, Jan 11, 2012	3.05	3.10	2.98	3.09
3758	NASDAQ	CERS	Tue, Jan 10, 2012	2.88	3.07	2.88	3.06
3757	NASDAQ	CERS	Mon, Jan 9, 2012	2.82	2.87	2.62	2.87
3756	NASDAQ	CERS	Fri, Jan 6, 2012	2.83	2.83	2.76	2.82
3755	NASDAQ	CERS	Thu, Jan 5, 2012	2.83	2.86	2.80	2.85
3754	NASDAQ	CERS	Wed, Jan 4, 2012	2.83	2.86	2.81	2.85
3753	NASDAQ	CERS	Tue, Jan 3, 2012	2.81	2.87	2.79	2.86
3752	NASDAQ	CERS	Fri, Dec 30, 2011	2.79	2.83	2.75	2.80
3751	NASDAQ	CERS	Thu, Dec 29, 2011	2.80	2.85	2.78	2.82
3750	NASDAQ	CERS	Wed, Dec 28, 2011	2.85	2.86	2.78	2.79
3749	NASDAQ	CERS	Tue, Dec 27, 2011	2.83	2.87	2.76	2.85
3748	NASDAQ	CERS	Fri, Dec 23, 2011	2.76	2.89	2.76	2.85
3747	NASDAQ	CERS	Thu, Dec 22, 2011	2.84	2.88	2.72	2.75
3746	NASDAQ	CERS	Wed, Dec 21, 2011	2.96	2.96	2.80	2.84
3745	NASDAQ	CERS	Tue, Dec 20, 2011	2.90	3.00	2.87	2.97
3744	NASDAQ	CERS	Mon, Dec 19, 2011	3.02	3.04	2.78	2.83
3743	NASDAQ	CERS	Fri, Dec 16, 2011	3.01	3.05	2.99	3.02
3742	NASDAQ	CERS	Thu, Dec 15, 2011	3.02	3.05	2.98	3.00
3741	NASDAQ	CERS	Wed, Dec 14, 2011	2.99	3.06	2.90	3.04
3740	NASDAQ	CERS	Tue, Dec 13, 2011	3.10	3.13	2.99	3.02
3739	NASDAQ	CERS	Mon, Dec 12, 2011	3.06	3.09	3.03	3.08
3738	NASDAQ	CERS	Fri, Dec 9, 2011	3.08	3.12	3.05	3.11
3737	NASDAQ	CERS	Thu, Dec 8, 2011	3.10	3.13	3.03	3.07
3736	NASDAQ	CERS	Wed, Dec 7, 2011	3.15	3.15	3.04	3.13
3735	NASDAQ	CERS	Tue, Dec 6, 2011	3.04	3.15	3.01	3.15
3734	NASDAQ	CERS	Mon, Dec 5, 2011	3.00	3.05	2.95	3.04
3733	NASDAQ	CERS	Fri, Dec 2, 2011	2.90	3.01	2.81	2.99
3732	NASDAQ	CERS	Thu, Dec 1, 2011	2.97	2.97	2.87	2.88
3731	NASDAQ	CERS	Wed, Nov 30, 2011	2.91	2.99	2.84	2.99
3730	NASDAQ	CERS	Tue, Nov 29, 2011	2.87	2.90	2.78	2.80
3729	NASDAQ	CERS	Mon, Nov 28, 2011	2.79	2.88	2.79	2.88
3728	NASDAQ	CERS	Fri, Nov 25, 2011	2.84	2.91	2.77	2.77
3727	NASDAQ	CERS	Wed, Nov 23, 2011	2.96	3.00	2.85	2.87
3726	NASDAQ	CERS	Tue, Nov 22, 2011	2.96	3.05	2.94	2.99
3725	NASDAQ	CERS	Mon, Nov 21, 2011	2.92	3.03	2.92	2.99
3724	NASDAQ	CERS	Fri, Nov 18, 2011	2.90	3.11	2.88	2.99
3723	NASDAQ	CERS	Thu, Nov 17, 2011	2.90	2.97	2.86	2.95
3722	NASDAQ	CERS	Wed, Nov 16, 2011	2.83	2.94	2.81	2.90
3721	NASDAQ	CERS	Tue, Nov 15, 2011	2.79	2.87	2.77	2.84
3720	NASDAQ	CERS	Mon, Nov 14, 2011	2.79	2.82	2.76	2.80
3719	NASDAQ	CERS	Fri, Nov 11, 2011	2.85	2.89	2.77	2.82
3718	NASDAQ	CERS	Thu, Nov 10, 2011	2.99	2.99	2.77	2.83
3717	NASDAQ	CERS	Wed, Nov 9, 2011	2.82	2.88	2.79	2.82
3716	NASDAQ	CERS	Tue, Nov 8, 2011	2.88	2.92	2.82	2.85
3715	NASDAQ	CERS	Mon, Nov 7, 2011	2.94	2.94	2.82	2.86
3714	NASDAQ	CERS	Fri, Nov 4, 2011	2.90	2.97	2.84	2.93
3713	NASDAQ	CERS	Thu, Nov 3, 2011	2.99	3.01	2.86	2.95
3712	NASDAQ	CERS	Wed, Nov 2, 2011	2.84	2.91	2.73	2.89
3711	NASDAQ	CERS	Tue, Nov 1, 2011	2.50	2.64	2.48	2.55
3710	NASDAQ	CERS	Mon, Oct 31, 2011	2.64	2.70	2.55	2.67
3709	NASDAQ	CERS	Fri, Oct 28, 2011	2.69	2.74	2.62	2.68
3708	NASDAQ	CERS	Thu, Oct 27, 2011	2.77	2.77	2.65	2.71
3707	NASDAQ	CERS	Wed, Oct 26, 2011	2.73	2.80	2.70	2.77
3706	NASDAQ	CERS	Tue, Oct 25, 2011	2.58	2.75	2.58	2.68
3705	NASDAQ	CERS	Mon, Oct 24, 2011	2.61	2.68	2.56	2.62
3704	NASDAQ	CERS	Fri, Oct 21, 2011	2.64	2.68	2.51	2.61
3703	NASDAQ	CERS	Thu, Oct 20, 2011	2.53	2.62	2.50	2.58
3702	NASDAQ	CERS	Wed, Oct 19, 2011	2.55	2.57	2.43	2.55
3701	NASDAQ	CERS	Tue, Oct 18, 2011	2.47	2.62	2.45	2.53
3700	NASDAQ	CERS	Mon, Oct 17, 2011	2.38	2.54	2.32	2.49
3699	NASDAQ	CERS	Fri, Oct 14, 2011	2.12	2.44	2.09	2.40
3698	NASDAQ	CERS	Thu, Oct 13, 2011	2.18	2.18	2.01	2.12
3697	NASDAQ	CERS	Wed, Oct 12, 2011	2.17	2.24	2.16	2.23
3696	NASDAQ	CERS	Tue, Oct 11, 2011	2.19	2.20	2.15	2.19
3695	NASDAQ	CERS	Mon, Oct 10, 2011	2.29	2.29	2.11	2.22
3694	NASDAQ	CERS	Fri, Oct 7, 2011	2.32	2.32	2.17	2.28
3693	NASDAQ	CERS	Thu, Oct 6, 2011	2.30	2.34	2.23	2.32
3692	NASDAQ	CERS	Wed, Oct 5, 2011	2.16	2.33	2.13	2.32
3691	NASDAQ	CERS	Tue, Oct 4, 2011	1.95	2.20	1.94	2.16
3690	NASDAQ	CERS	Mon, Oct 3, 2011	2.10	2.15	1.98	1.98
3689	NASDAQ	CERS	Fri, Sep 30, 2011	2.08	2.19	2.02	2.12
3688	NASDAQ	CERS	Thu, Sep 29, 2011	2.15	2.15	2.04	2.12
3687	NASDAQ	CERS	Wed, Sep 28, 2011	2.15	2.19	2.12	2.13
3686	NASDAQ	CERS	Tue, Sep 27, 2011	2.20	2.20	2.08	2.15
3685	NASDAQ	CERS	Mon, Sep 26, 2011	2.09	2.18	2.03	2.17
3684	NASDAQ	CERS	Fri, Sep 23, 2011	2.02	2.11	1.99	2.07
3683	NASDAQ	CERS	Thu, Sep 22, 2011	1.95	2.11	1.95	2.02
3682	NASDAQ	CERS	Wed, Sep 21, 2011	2.07	2.14	2.00	2.00
3681	NASDAQ	CERS	Tue, Sep 20, 2011	2.10	2.15	2.07	2.08
3680	NASDAQ	CERS	Mon, Sep 19, 2011	2.07	2.12	2.07	2.10
3679	NASDAQ	CERS	Fri, Sep 16, 2011	2.12	2.17	2.07	2.10
3678	NASDAQ	CERS	Thu, Sep 15, 2011	2.10	2.12	2.03	2.10
3677	NASDAQ	CERS	Wed, Sep 14, 2011	2.04	2.10	1.97	2.08
3676	NASDAQ	CERS	Tue, Sep 13, 2011	2.02	2.05	1.97	2.03
3675	NASDAQ	CERS	Mon, Sep 12, 2011	1.96	2.02	1.96	2.01
3674	NASDAQ	CERS	Fri, Sep 9, 2011	2.02	2.06	1.95	2.00
3673	NASDAQ	CERS	Thu, Sep 8, 2011	2.05	2.11	2.02	2.05
3672	NASDAQ	CERS	Wed, Sep 7, 2011	2.05	2.14	2.04	2.06
3671	NASDAQ	CERS	Tue, Sep 6, 2011	1.95	2.04	1.95	2.01
3670	NASDAQ	CERS	Fri, Sep 2, 2011	2.02	2.06	1.98	2.02
3669	NASDAQ	CERS	Thu, Sep 1, 2011	2.06	2.16	2.05	2.08
3668	NASDAQ	CERS	Wed, Aug 31, 2011	2.11	2.17	2.02	2.05
3667	NASDAQ	CERS	Tue, Aug 30, 2011	2.08	2.11	2.03	2.10
3666	NASDAQ	CERS	Mon, Aug 29, 2011	2.10	2.17	2.01	2.11
3665	NASDAQ	CERS	Fri, Aug 26, 2011	2.00	2.10	1.96	2.08
3664	NASDAQ	CERS	Thu, Aug 25, 2011	2.11	2.14	2.01	2.03
3663	NASDAQ	CERS	Wed, Aug 24, 2011	2.10	2.11	2.01	2.10
3662	NASDAQ	CERS	Tue, Aug 23, 2011	1.98	2.10	1.92	2.10
3661	NASDAQ	CERS	Mon, Aug 22, 2011	2.07	2.07	1.93	1.98
3660	NASDAQ	CERS	Fri, Aug 19, 2011	2.01	2.09	2.00	2.01
3659	NASDAQ	CERS	Thu, Aug 18, 2011	2.02	2.18	2.02	2.02
3658	NASDAQ	CERS	Wed, Aug 17, 2011	2.05	2.20	2.05	2.09
3657	NASDAQ	CERS	Tue, Aug 16, 2011	2.09	2.11	2.01	2.05
3656	NASDAQ	CERS	Mon, Aug 15, 2011	2.06	2.19	2.06	2.13
3655	NASDAQ	CERS	Fri, Aug 12, 2011	2.17	2.17	2.03	2.04
3654	NASDAQ	CERS	Thu, Aug 11, 2011	2.02	2.19	1.96	2.15
3653	NASDAQ	CERS	Wed, Aug 10, 2011	2.12	2.23	2.00	2.01
3652	NASDAQ	CERS	Tue, Aug 9, 2011	2.12	2.22	2.00	2.20
3651	NASDAQ	CERS	Mon, Aug 8, 2011	2.14	2.23	2.02	2.04
3650	NASDAQ	CERS	Fri, Aug 5, 2011	2.36	2.39	2.15	2.27
3649	NASDAQ	CERS	Thu, Aug 4, 2011	2.52	2.52	2.34	2.36
3648	NASDAQ	CERS	Wed, Aug 3, 2011	2.72	2.72	2.53	2.56
3647	NASDAQ	CERS	Tue, Aug 2, 2011	2.70	2.79	2.67	2.73
3646	NASDAQ	CERS	Mon, Aug 1, 2011	2.80	2.84	2.73	2.74
3645	NASDAQ	CERS	Fri, Jul 29, 2011	2.80	2.80	2.70	2.77
3644	NASDAQ	CERS	Thu, Jul 28, 2011	2.82	2.89	2.80	2.83
3643	NASDAQ	CERS	Wed, Jul 27, 2011	2.85	2.89	2.79	2.81
3642	NASDAQ	CERS	Tue, Jul 26, 2011	2.89	2.93	2.85	2.86
3641	NASDAQ	CERS	Mon, Jul 25, 2011	2.90	2.94	2.84	2.90
3640	NASDAQ	CERS	Fri, Jul 22, 2011	2.83	2.95	2.81	2.94
3639	NASDAQ	CERS	Thu, Jul 21, 2011	2.93	2.94	2.82	2.84
3638	NASDAQ	CERS	Wed, Jul 20, 2011	2.94	2.95	2.84	2.92
3637	NASDAQ	CERS	Tue, Jul 19, 2011	2.85	2.93	2.79	2.93
3636	NASDAQ	CERS	Mon, Jul 18, 2011	2.84	2.92	2.81	2.82
3635	NASDAQ	CERS	Fri, Jul 15, 2011	2.90	2.91	2.82	2.86
3634	NASDAQ	CERS	Thu, Jul 14, 2011	2.93	2.96	2.83	2.90
3633	NASDAQ	CERS	Wed, Jul 13, 2011	2.88	2.97	2.88	2.93
3632	NASDAQ	CERS	Tue, Jul 12, 2011	2.91	2.95	2.86	2.89
3631	NASDAQ	CERS	Mon, Jul 11, 2011	2.88	2.93	2.87	2.92
3630	NASDAQ	CERS	Fri, Jul 8, 2011	2.91	2.95	2.86	2.92
3629	NASDAQ	CERS	Thu, Jul 7, 2011	2.95	2.96	2.91	2.95
3628	NASDAQ	CERS	Wed, Jul 6, 2011	2.95	2.96	2.91	2.93
3627	NASDAQ	CERS	Tue, Jul 5, 2011	3.00	3.02	2.93	2.95
3626	NASDAQ	CERS	Fri, Jul 1, 2011	3.02	3.07	3.00	3.02
3625	NASDAQ	CERS	Thu, Jun 30, 2011	2.97	3.05	2.94	3.00
3624	NASDAQ	CERS	Wed, Jun 29, 2011	2.96	2.97	2.92	2.95
3623	NASDAQ	CERS	Tue, Jun 28, 2011	2.93	2.95	2.86	2.93
3622	NASDAQ	CERS	Mon, Jun 27, 2011	2.98	2.98	2.88	2.90
3621	NASDAQ	CERS	Fri, Jun 24, 2011	2.86	3.00	2.86	3.00
3620	NASDAQ	CERS	Thu, Jun 23, 2011	2.78	2.90	2.78	2.86
3619	NASDAQ	CERS	Wed, Jun 22, 2011	2.81	2.87	2.80	2.82
3618	NASDAQ	CERS	Tue, Jun 21, 2011	2.85	2.87	2.79	2.84
3617	NASDAQ	CERS	Mon, Jun 20, 2011	2.76	2.84	2.70	2.82
3616	NASDAQ	CERS	Fri, Jun 17, 2011	2.81	2.86	2.73	2.76
3615	NASDAQ	CERS	Thu, Jun 16, 2011	2.81	2.84	2.69	2.80
3614	NASDAQ	CERS	Wed, Jun 15, 2011	2.77	2.81	2.75	2.79
3613	NASDAQ	CERS	Tue, Jun 14, 2011	2.67	2.81	2.65	2.81
3612	NASDAQ	CERS	Mon, Jun 13, 2011	2.69	2.74	2.62	2.64
3611	NASDAQ	CERS	Fri, Jun 10, 2011	2.77	2.81	2.68	2.68
3610	NASDAQ	CERS	Thu, Jun 9, 2011	2.74	2.87	2.72	2.76
3609	NASDAQ	CERS	Wed, Jun 8, 2011	2.79	2.83	2.75	2.77
3608	NASDAQ	CERS	Tue, Jun 7, 2011	2.73	2.84	2.72	2.81
3607	NASDAQ	CERS	Mon, Jun 6, 2011	2.85	2.88	2.71	2.71
3606	NASDAQ	CERS	Fri, Jun 3, 2011	2.88	2.94	2.84	2.85
3605	NASDAQ	CERS	Thu, Jun 2, 2011	2.85	2.91	2.85	2.86
3604	NASDAQ	CERS	Wed, Jun 1, 2011	2.96	2.97	2.87	2.88
3603	NASDAQ	CERS	Tue, May 31, 2011	2.95	3.00	2.87	3.00
3602	NASDAQ	CERS	Fri, May 27, 2011	2.92	2.96	2.86	2.94
3601	NASDAQ	CERS	Thu, May 26, 2011	2.86	2.93	2.85	2.90
3600	NASDAQ	CERS	Wed, May 25, 2011	2.87	2.91	2.85	2.88
3599	NASDAQ	CERS	Tue, May 24, 2011	2.91	2.94	2.85	2.89
3598	NASDAQ	CERS	Mon, May 23, 2011	2.93	3.00	2.89	2.91
3597	NASDAQ	CERS	Fri, May 20, 2011	2.96	3.07	2.91	3.00
3596	NASDAQ	CERS	Thu, May 19, 2011	3.01	3.02	2.90	2.95
3595	NASDAQ	CERS	Wed, May 18, 2011	2.94	3.03	2.88	3.01
3594	NASDAQ	CERS	Tue, May 17, 2011	2.89	3.03	2.87	2.94
3593	NASDAQ	CERS	Mon, May 16, 2011	3.01	3.08	2.93	2.93
3592	NASDAQ	CERS	Fri, May 13, 2011	2.93	2.98	2.85	2.88
3591	NASDAQ	CERS	Thu, May 12, 2011	2.98	3.00	2.88	2.93
3590	NASDAQ	CERS	Wed, May 11, 2011	3.00	3.06	2.96	3.00
3589	NASDAQ	CERS	Tue, May 10, 2011	2.95	3.16	2.95	3.04
3588	NASDAQ	CERS	Mon, May 9, 2011	2.82	3.09	2.76	2.96
3587	NASDAQ	CERS	Fri, May 6, 2011	2.76	2.79	2.70	2.71
3586	NASDAQ	CERS	Thu, May 5, 2011	2.68	2.83	2.68	2.72
3585	NASDAQ	CERS	Wed, May 4, 2011	2.77	2.80	2.70	2.70
3584	NASDAQ	CERS	Tue, May 3, 2011	2.80	2.91	2.76	2.80
3583	NASDAQ	CERS	Mon, May 2, 2011	2.96	2.98	2.80	2.80
3582	NASDAQ	CERS	Fri, Apr 29, 2011	2.80	3.00	2.80	2.96
3581	NASDAQ	CERS	Thu, Apr 28, 2011	2.85	2.92	2.82	2.90
3580	NASDAQ	CERS	Wed, Apr 27, 2011	2.90	2.92	2.79	2.87
3579	NASDAQ	CERS	Tue, Apr 26, 2011	2.90	2.95	2.84	2.90
3578	NASDAQ	CERS	Mon, Apr 25, 2011	2.74	2.93	2.74	2.90
3577	NASDAQ	CERS	Thu, Apr 21, 2011	2.76	2.80	2.71	2.75
3576	NASDAQ	CERS	Wed, Apr 20, 2011	2.71	2.84	2.70	2.72
3575	NASDAQ	CERS	Tue, Apr 19, 2011	2.75	2.77	2.70	2.70
3574	NASDAQ	CERS	Mon, Apr 18, 2011	2.74	2.80	2.70	2.72
3573	NASDAQ	CERS	Fri, Apr 15, 2011	2.77	2.81	2.70	2.79
3572	NASDAQ	CERS	Thu, Apr 14, 2011	2.66	2.81	2.66	2.80
3571	NASDAQ	CERS	Wed, Apr 13, 2011	2.71	2.74	2.67	2.69
3570	NASDAQ	CERS	Tue, Apr 12, 2011	2.70	2.78	2.69	2.69
3569	NASDAQ	CERS	Mon, Apr 11, 2011	2.73	2.81	2.72	2.73
3568	NASDAQ	CERS	Fri, Apr 8, 2011	2.81	2.84	2.73	2.73
3567	NASDAQ	CERS	Thu, Apr 7, 2011	2.90	2.93	2.80	2.80
3566	NASDAQ	CERS	Wed, Apr 6, 2011	2.95	2.99	2.86	2.89
3565	NASDAQ	CERS	Tue, Apr 5, 2011	2.87	2.98	2.82	2.95
3564	NASDAQ	CERS	Mon, Apr 4, 2011	2.89	2.90	2.85	2.88
3563	NASDAQ	CERS	Fri, Apr 1, 2011	2.93	2.93	2.75	2.90
3562	NASDAQ	CERS	Thu, Mar 31, 2011	2.91	2.93	2.84	2.91
3561	NASDAQ	CERS	Wed, Mar 30, 2011	2.97	3.00	2.86	2.91
3560	NASDAQ	CERS	Tue, Mar 29, 2011	2.95	2.97	2.87	2.93
3559	NASDAQ	CERS	Mon, Mar 28, 2011	2.93	2.97	2.83	2.93
3558	NASDAQ	CERS	Fri, Mar 25, 2011	2.81	2.99	2.80	2.90
3557	NASDAQ	CERS	Thu, Mar 24, 2011	2.76	2.85	2.72	2.80
3556	NASDAQ	CERS	Wed, Mar 23, 2011	2.76	2.80	2.70	2.76
3555	NASDAQ	CERS	Tue, Mar 22, 2011	2.73	2.81	2.70	2.78
3554	NASDAQ	CERS	Mon, Mar 21, 2011	2.64	2.84	2.64	2.72
3553	NASDAQ	CERS	Fri, Mar 18, 2011	2.51	2.57	2.47	2.56
3552	NASDAQ	CERS	Thu, Mar 17, 2011	2.50	2.52	2.45	2.47
3551	NASDAQ	CERS	Wed, Mar 16, 2011	2.48	2.59	2.45	2.47
3550	NASDAQ	CERS	Tue, Mar 15, 2011	2.50	2.54	2.45	2.52
3549	NASDAQ	CERS	Mon, Mar 14, 2011	2.55	2.62	2.52	2.56
3548	NASDAQ	CERS	Fri, Mar 11, 2011	2.55	2.64	2.50	2.59
3547	NASDAQ	CERS	Thu, Mar 10, 2011	2.60	2.68	2.57	2.60
3546	NASDAQ	CERS	Wed, Mar 9, 2011	2.72	2.75	2.66	2.68
3545	NASDAQ	CERS	Tue, Mar 8, 2011	2.66	2.79	2.64	2.72
3544	NASDAQ	CERS	Mon, Mar 7, 2011	2.87	2.92	2.63	2.66
3543	NASDAQ	CERS	Fri, Mar 4, 2011	3.00	3.01	2.83	2.90
3542	NASDAQ	CERS	Thu, Mar 3, 2011	3.32	3.39	3.28	3.36
3541	NASDAQ	CERS	Wed, Mar 2, 2011	3.27	3.30	3.25	3.28
3540	NASDAQ	CERS	Tue, Mar 1, 2011	3.45	3.45	3.28	3.28
3539	NASDAQ	CERS	Mon, Feb 28, 2011	3.50	3.59	3.40	3.44
3538	NASDAQ	CERS	Fri, Feb 25, 2011	3.24	3.52	3.23	3.49
3537	NASDAQ	CERS	Thu, Feb 24, 2011	3.20	3.28	3.14	3.25
3536	NASDAQ	CERS	Wed, Feb 23, 2011	3.35	3.39	3.18	3.21
3535	NASDAQ	CERS	Tue, Feb 22, 2011	3.50	3.50	3.32	3.33
3534	NASDAQ	CERS	Fri, Feb 18, 2011	3.58	3.67	3.48	3.53
3533	NASDAQ	CERS	Thu, Feb 17, 2011	3.55	3.67	3.53	3.57
3532	NASDAQ	CERS	Wed, Feb 16, 2011	3.48	3.59	3.39	3.54
3531	NASDAQ	CERS	Tue, Feb 15, 2011	3.41	3.44	3.32	3.38
3530	NASDAQ	CERS	Mon, Feb 14, 2011	3.43	3.50	3.38	3.41
3529	NASDAQ	CERS	Fri, Feb 11, 2011	3.36	3.45	3.31	3.44
3528	NASDAQ	CERS	Thu, Feb 10, 2011	3.39	3.45	3.34	3.37
3527	NASDAQ	CERS	Wed, Feb 9, 2011	3.41	3.50	3.37	3.40
3526	NASDAQ	CERS	Tue, Feb 8, 2011	3.38	3.45	3.34	3.44
3525	NASDAQ	CERS	Mon, Feb 7, 2011	3.34	3.47	3.33	3.36
3524	NASDAQ	CERS	Fri, Feb 4, 2011	3.34	3.40	3.27	3.35
3523	NASDAQ	CERS	Thu, Feb 3, 2011	3.30	3.35	3.27	3.33
3522	NASDAQ	CERS	Wed, Feb 2, 2011	3.36	3.42	3.30	3.31
3521	NASDAQ	CERS	Tue, Feb 1, 2011	3.32	3.45	3.31	3.40
3520	NASDAQ	CERS	Mon, Jan 31, 2011	3.27	3.30	3.11	3.30
3519	NASDAQ	CERS	Fri, Jan 28, 2011	3.45	3.51	3.20	3.24
3518	NASDAQ	CERS	Thu, Jan 27, 2011	3.50	3.59	3.44	3.46
3517	NASDAQ	CERS	Wed, Jan 26, 2011	3.49	3.50	3.38	3.49
3516	NASDAQ	CERS	Tue, Jan 25, 2011	3.59	3.61	3.47	3.49
3515	NASDAQ	CERS	Mon, Jan 24, 2011	3.59	3.62	3.53	3.56
3514	NASDAQ	CERS	Fri, Jan 21, 2011	3.59	3.63	3.55	3.55
3513	NASDAQ	CERS	Thu, Jan 20, 2011	3.60	3.64	3.45	3.54
3512	NASDAQ	CERS	Wed, Jan 19, 2011	3.60	3.68	3.27	3.44
3511	NASDAQ	CERS	Tue, Jan 18, 2011	3.55	3.65	3.50	3.56
3510	NASDAQ	CERS	Fri, Jan 14, 2011	3.14	3.44	3.10	3.42
3509	NASDAQ	CERS	Thu, Jan 13, 2011	3.07	3.17	2.95	3.04
3508	NASDAQ	CERS	Wed, Jan 12, 2011	2.90	2.93	2.83	2.88
3507	NASDAQ	CERS	Tue, Jan 11, 2011	2.82	2.97	2.82	2.86
3506	NASDAQ	CERS	Mon, Jan 10, 2011	2.63	2.82	2.63	2.82
3505	NASDAQ	CERS	Fri, Jan 7, 2011	2.64	2.82	2.61	2.63
3504	NASDAQ	CERS	Thu, Jan 6, 2011	2.56	2.73	2.51	2.62
3503	NASDAQ	CERS	Wed, Jan 5, 2011	2.40	2.58	2.40	2.58
3502	NASDAQ	CERS	Tue, Jan 4, 2011	2.48	2.51	2.40	2.40
3501	NASDAQ	CERS	Mon, Jan 3, 2011	2.47	2.54	2.45	2.48
3500	NASDAQ	CERS	Fri, Dec 31, 2010	2.48	2.52	2.45	2.46
3499	NASDAQ	CERS	Thu, Dec 30, 2010	2.55	2.62	2.48	2.48
3498	NASDAQ	CERS	Wed, Dec 29, 2010	2.59	2.60	2.51	2.55
3497	NASDAQ	CERS	Tue, Dec 28, 2010	2.60	2.63	2.54	2.57
3496	NASDAQ	CERS	Mon, Dec 27, 2010	2.43	2.62	2.43	2.61
3495	NASDAQ	CERS	Thu, Dec 23, 2010	2.50	2.50	2.44	2.46
3494	NASDAQ	CERS	Wed, Dec 22, 2010	2.48	2.57	2.43	2.49
3493	NASDAQ	CERS	Tue, Dec 21, 2010	2.38	2.50	2.33	2.48
3492	NASDAQ	CERS	Mon, Dec 20, 2010	2.30	2.40	2.23	2.38
3491	NASDAQ	CERS	Fri, Dec 17, 2010	2.30	2.32	2.21	2.32
3490	NASDAQ	CERS	Thu, Dec 16, 2010	2.31	2.37	2.26	2.29
3489	NASDAQ	CERS	Wed, Dec 15, 2010	2.45	2.45	2.13	2.33
3488	NASDAQ	CERS	Tue, Dec 14, 2010	2.11	2.21	2.11	2.19
3487	NASDAQ	CERS	Mon, Dec 13, 2010	2.31	2.32	2.11	2.12
3486	NASDAQ	CERS	Fri, Dec 10, 2010	2.36	2.40	2.13	2.18
3485	NASDAQ	CERS	Thu, Dec 9, 2010	2.40	2.40	2.32	2.34
3484	NASDAQ	CERS	Wed, Dec 8, 2010	2.43	2.44	2.38	2.38
3483	NASDAQ	CERS	Tue, Dec 7, 2010	2.39	2.47	2.38	2.44
3482	NASDAQ	CERS	Mon, Dec 6, 2010	2.40	2.41	2.37	2.39
3481	NASDAQ	CERS	Fri, Dec 3, 2010	2.38	2.41	2.35	2.40
3480	NASDAQ	CERS	Thu, Dec 2, 2010	2.41	2.41	2.35	2.40
3479	NASDAQ	CERS	Wed, Dec 1, 2010	2.49	2.49	2.35	2.41
3478	NASDAQ	CERS	Tue, Nov 30, 2010	2.48	2.51	2.41	2.41
3477	NASDAQ	CERS	Mon, Nov 29, 2010	2.51	2.54	2.44	2.47
3476	NASDAQ	CERS	Fri, Nov 26, 2010	2.51	2.60	2.51	2.51
3475	NASDAQ	CERS	Wed, Nov 24, 2010	2.47	2.53	2.37	2.53
3474	NASDAQ	CERS	Tue, Nov 23, 2010	2.47	2.51	2.43	2.43
3473	NASDAQ	CERS	Mon, Nov 22, 2010	2.51	2.57	2.50	2.51
3472	NASDAQ	CERS	Fri, Nov 19, 2010	2.55	2.56	2.47	2.51
3471	NASDAQ	CERS	Thu, Nov 18, 2010	2.50	2.58	2.49	2.55
3470	NASDAQ	CERS	Wed, Nov 17, 2010	2.53	2.58	2.47	2.48
3469	NASDAQ	CERS	Tue, Nov 16, 2010	2.58	2.65	2.52	2.53
3468	NASDAQ	CERS	Mon, Nov 15, 2010	2.57	2.60	2.56	2.56
3467	NASDAQ	CERS	Fri, Nov 12, 2010	2.58	2.60	2.52	2.55
3466	NASDAQ	CERS	Thu, Nov 11, 2010	2.57	2.65	2.51	2.55
3465	NASDAQ	CERS	Wed, Nov 10, 2010	2.75	2.75	2.49	2.50
3464	NASDAQ	CERS	Tue, Nov 9, 2010	3.13	3.25	3.12	3.16
3463	NASDAQ	CERS	Mon, Nov 8, 2010	3.21	3.26	3.13	3.15
3462	NASDAQ	CERS	Fri, Nov 5, 2010	3.33	3.35	3.23	3.23
3461	NASDAQ	CERS	Thu, Nov 4, 2010	3.35	3.38	3.31	3.36
3460	NASDAQ	CERS	Wed, Nov 3, 2010	3.33	3.35	3.22	3.29
3459	NASDAQ	CERS	Tue, Nov 2, 2010	3.29	3.35	3.25	3.35
3458	NASDAQ	CERS	Mon, Nov 1, 2010	3.33	3.34	3.24	3.25
3457	NASDAQ	CERS	Fri, Oct 29, 2010	3.40	3.42	3.25	3.29
3456	NASDAQ	CERS	Thu, Oct 28, 2010	3.40	3.50	3.37	3.40
3455	NASDAQ	CERS	Wed, Oct 27, 2010	3.49	3.50	3.34	3.38
3454	NASDAQ	CERS	Tue, Oct 26, 2010	3.29	3.52	3.26	3.51
3453	NASDAQ	CERS	Mon, Oct 25, 2010	3.23	3.35	3.20	3.30
3452	NASDAQ	CERS	Fri, Oct 22, 2010	3.20	3.31	3.15	3.24
3451	NASDAQ	CERS	Thu, Oct 21, 2010	3.30	3.30	3.17	3.20
3450	NASDAQ	CERS	Wed, Oct 20, 2010	3.39	3.40	3.20	3.28
3449	NASDAQ	CERS	Tue, Oct 19, 2010	3.62	3.67	3.35	3.36
3448	NASDAQ	CERS	Mon, Oct 18, 2010	3.85	3.86	3.65	3.65
3447	NASDAQ	CERS	Fri, Oct 15, 2010	3.84	3.92	3.79	3.82
3446	NASDAQ	CERS	Thu, Oct 14, 2010	3.93	3.95	3.74	3.78
3445	NASDAQ	CERS	Wed, Oct 13, 2010	3.95	3.95	3.88	3.93
3444	NASDAQ	CERS	Tue, Oct 12, 2010	3.83	3.91	3.82	3.87
3443	NASDAQ	CERS	Mon, Oct 11, 2010	3.71	3.82	3.71	3.81
3442	NASDAQ	CERS	Fri, Oct 8, 2010	3.73	3.73	3.70	3.71
3441	NASDAQ	CERS	Thu, Oct 7, 2010	3.85	3.86	3.71	3.74
3440	NASDAQ	CERS	Wed, Oct 6, 2010	3.83	3.86	3.80	3.80
3439	NASDAQ	CERS	Tue, Oct 5, 2010	3.82	3.88	3.75	3.84
3438	NASDAQ	CERS	Mon, Oct 4, 2010	3.80	3.92	3.78	3.78
3437	NASDAQ	CERS	Fri, Oct 1, 2010	3.89	3.95	3.75	3.85
3436	NASDAQ	CERS	Thu, Sep 30, 2010	3.89	3.96	3.84	3.84
3435	NASDAQ	CERS	Wed, Sep 29, 2010	3.89	4.01	3.80	3.88
3434	NASDAQ	CERS	Tue, Sep 28, 2010	3.81	3.90	3.65	3.90
3433	NASDAQ	CERS	Mon, Sep 27, 2010	3.86	3.90	3.77	3.80
3432	NASDAQ	CERS	Fri, Sep 24, 2010	3.74	3.80	3.70	3.77
3431	NASDAQ	CERS	Thu, Sep 23, 2010	3.83	3.85	3.62	3.68
3430	NASDAQ	CERS	Wed, Sep 22, 2010	3.68	3.86	3.67	3.81
3429	NASDAQ	CERS	Tue, Sep 21, 2010	3.90	3.90	3.68	3.68
3428	NASDAQ	CERS	Mon, Sep 20, 2010	3.75	3.95	3.75	3.90
3427	NASDAQ	CERS	Fri, Sep 17, 2010	3.74	3.78	3.65	3.74
3426	NASDAQ	CERS	Thu, Sep 16, 2010	3.61	3.71	3.61	3.65
3425	NASDAQ	CERS	Wed, Sep 15, 2010	3.65	3.69	3.61	3.63
3424	NASDAQ	CERS	Tue, Sep 14, 2010	3.85	3.85	3.63	3.64
3423	NASDAQ	CERS	Mon, Sep 13, 2010	3.75	3.85	3.71	3.78
3422	NASDAQ	CERS	Fri, Sep 10, 2010	3.75	3.92	3.61	3.63
3421	NASDAQ	CERS	Thu, Sep 9, 2010	3.75	3.82	3.64	3.71
3420	NASDAQ	CERS	Wed, Sep 8, 2010	3.30	3.95	3.28	3.66
3419	NASDAQ	CERS	Tue, Sep 7, 2010	3.15	3.35	3.10	3.24
3418	NASDAQ	CERS	Fri, Sep 3, 2010	3.15	3.18	3.12	3.13
3417	NASDAQ	CERS	Thu, Sep 2, 2010	3.10	3.16	3.02	3.13
3416	NASDAQ	CERS	Wed, Sep 1, 2010	2.92	3.00	2.87	3.00
3415	NASDAQ	CERS	Tue, Aug 31, 2010	2.89	2.95	2.86	2.87
3414	NASDAQ	CERS	Mon, Aug 30, 2010	2.94	2.98	2.87	2.87
3413	NASDAQ	CERS	Fri, Aug 27, 2010	2.96	2.97	2.91	2.94
3412	NASDAQ	CERS	Thu, Aug 26, 2010	2.98	3.02	2.91	2.91
3411	NASDAQ	CERS	Wed, Aug 25, 2010	2.89	2.99	2.85	2.98
3410	NASDAQ	CERS	Tue, Aug 24, 2010	2.90	2.95	2.90	2.92
3409	NASDAQ	CERS	Mon, Aug 23, 2010	2.88	3.10	2.88	2.98
3408	NASDAQ	CERS	Fri, Aug 20, 2010	2.86	2.91	2.86	2.87
3407	NASDAQ	CERS	Thu, Aug 19, 2010	2.95	3.01	2.86	2.87
3406	NASDAQ	CERS	Wed, Aug 18, 2010	3.06	3.07	2.95	2.97
3405	NASDAQ	CERS	Tue, Aug 17, 2010	3.01	3.11	2.97	3.07
3404	NASDAQ	CERS	Mon, Aug 16, 2010	2.85	2.99	2.85	2.98
3403	NASDAQ	CERS	Fri, Aug 13, 2010	2.91	2.98	2.85	2.86
3402	NASDAQ	CERS	Thu, Aug 12, 2010	2.90	3.05	2.90	2.94
3401	NASDAQ	CERS	Wed, Aug 11, 2010	3.09	3.13	2.94	2.94
3400	NASDAQ	CERS	Tue, Aug 10, 2010	3.17	3.20	3.10	3.11
3399	NASDAQ	CERS	Mon, Aug 9, 2010	3.16	3.23	3.16	3.21
3398	NASDAQ	CERS	Fri, Aug 6, 2010	3.13	3.23	3.10	3.15
3397	NASDAQ	CERS	Thu, Aug 5, 2010	3.19	3.24	3.16	3.18
3396	NASDAQ	CERS	Wed, Aug 4, 2010	3.16	3.22	3.15	3.22
3395	NASDAQ	CERS	Tue, Aug 3, 2010	3.15	3.24	3.12	3.12
3394	NASDAQ	CERS	Mon, Aug 2, 2010	3.12	3.23	3.10	3.17
3393	NASDAQ	CERS	Fri, Jul 30, 2010	2.95	3.15	2.95	3.10
3392	NASDAQ	CERS	Thu, Jul 29, 2010	3.13	3.19	2.97	2.97
3391	NASDAQ	CERS	Wed, Jul 28, 2010	3.14	3.17	3.09	3.13
3390	NASDAQ	CERS	Tue, Jul 27, 2010	3.26	3.26	3.13	3.16
3389	NASDAQ	CERS	Mon, Jul 26, 2010	3.08	3.25	3.06	3.24
3388	NASDAQ	CERS	Fri, Jul 23, 2010	3.05	3.10	2.99	3.09
3387	NASDAQ	CERS	Thu, Jul 22, 2010	2.93	3.07	2.91	3.07
3386	NASDAQ	CERS	Wed, Jul 21, 2010	2.99	3.06	2.88	2.88
3385	NASDAQ	CERS	Tue, Jul 20, 2010	2.95	2.98	2.88	2.98
3384	NASDAQ	CERS	Mon, Jul 19, 2010	3.04	3.09	2.86	3.00
3383	NASDAQ	CERS	Fri, Jul 16, 2010	3.10	3.11	3.01	3.04
3382	NASDAQ	CERS	Thu, Jul 15, 2010	3.15	3.20	3.05	3.10
3381	NASDAQ	CERS	Wed, Jul 14, 2010	3.10	3.18	3.07	3.14
3380	NASDAQ	CERS	Tue, Jul 13, 2010	2.99	3.15	2.98	3.12
3379	NASDAQ	CERS	Mon, Jul 12, 2010	2.99	3.02	2.95	2.99
3378	NASDAQ	CERS	Fri, Jul 9, 2010	2.97	3.01	2.89	2.99
3377	NASDAQ	CERS	Thu, Jul 8, 2010	2.97	3.01	2.92	2.99
3376	NASDAQ	CERS	Wed, Jul 7, 2010	2.93	2.96	2.80	2.95
3375	NASDAQ	CERS	Tue, Jul 6, 2010	3.03	3.11	2.92	2.92
3374	NASDAQ	CERS	Fri, Jul 2, 2010	3.03	3.03	2.92	2.99
3373	NASDAQ	CERS	Thu, Jul 1, 2010	3.20	3.20	2.89	3.00
3372	NASDAQ	CERS	Wed, Jun 30, 2010	3.09	3.19	3.03	3.16
3371	NASDAQ	CERS	Tue, Jun 29, 2010	3.20	3.22	3.05	3.05
3370	NASDAQ	CERS	Mon, Jun 28, 2010	3.42	3.42	3.27	3.27
3369	NASDAQ	CERS	Fri, Jun 25, 2010	3.16	3.48	3.15	3.42
3368	NASDAQ	CERS	Thu, Jun 24, 2010	3.33	3.38	3.15	3.19
3367	NASDAQ	CERS	Wed, Jun 23, 2010	3.32	3.37	3.21	3.31
3366	NASDAQ	CERS	Tue, Jun 22, 2010	3.22	3.35	3.18	3.29
3365	NASDAQ	CERS	Mon, Jun 21, 2010	3.47	3.47	3.21	3.25
3364	NASDAQ	CERS	Fri, Jun 18, 2010	3.30	3.47	3.30	3.47
3363	NASDAQ	CERS	Thu, Jun 17, 2010	3.33	3.33	3.26	3.32
3362	NASDAQ	CERS	Wed, Jun 16, 2010	3.28	3.32	3.25	3.30
3361	NASDAQ	CERS	Tue, Jun 15, 2010	3.19	3.28	3.14	3.27
3360	NASDAQ	CERS	Mon, Jun 14, 2010	3.21	3.21	3.14	3.18
3359	NASDAQ	CERS	Fri, Jun 11, 2010	3.08	3.22	3.08	3.17
3358	NASDAQ	CERS	Thu, Jun 10, 2010	3.19	3.21	3.11	3.16
3357	NASDAQ	CERS	Wed, Jun 9, 2010	3.19	3.21	3.06	3.15
3356	NASDAQ	CERS	Tue, Jun 8, 2010	3.00	3.17	2.96	3.17
3355	NASDAQ	CERS	Mon, Jun 7, 2010	3.25	3.28	3.02	3.02
3354	NASDAQ	CERS	Fri, Jun 4, 2010	3.17	3.32	3.17	3.19
3353	NASDAQ	CERS	Thu, Jun 3, 2010	3.31	3.35	3.17	3.30
3352	NASDAQ	CERS	Wed, Jun 2, 2010	3.25	3.31	3.16	3.31
3351	NASDAQ	CERS	Tue, Jun 1, 2010	3.07	3.27	3.06	3.20
3350	NASDAQ	CERS	Fri, May 28, 2010	3.05	3.24	2.92	3.16
3349	NASDAQ	CERS	Thu, May 27, 2010	2.94	3.06	2.94	3.05
3348	NASDAQ	CERS	Wed, May 26, 2010	2.77	2.95	2.75	2.80
3347	NASDAQ	CERS	Tue, May 25, 2010	2.65	2.76	2.62	2.70
3346	NASDAQ	CERS	Mon, May 24, 2010	2.75	2.88	2.67	2.81
3345	NASDAQ	CERS	Fri, May 21, 2010	2.65	2.84	2.61	2.72
3344	NASDAQ	CERS	Thu, May 20, 2010	2.96	2.96	2.74	2.75
3343	NASDAQ	CERS	Wed, May 19, 2010	2.99	3.02	2.94	3.02
3342	NASDAQ	CERS	Tue, May 18, 2010	2.95	3.05	2.91	2.97
3341	NASDAQ	CERS	Mon, May 17, 2010	2.75	2.96	2.75	2.86
3340	NASDAQ	CERS	Fri, May 14, 2010	2.90	2.90	2.75	2.79
3339	NASDAQ	CERS	Thu, May 13, 2010	3.08	3.09	2.89	2.92
3338	NASDAQ	CERS	Wed, May 12, 2010	3.05	3.10	2.99	3.06
3337	NASDAQ	CERS	Tue, May 11, 2010	2.92	3.08	2.86	2.98
3336	NASDAQ	CERS	Mon, May 10, 2010	2.95	2.97	2.72	2.93
3335	NASDAQ	CERS	Fri, May 7, 2010	2.60	2.73	2.44	2.61
3334	NASDAQ	CERS	Thu, May 6, 2010	2.86	2.86	2.42	2.55
3333	NASDAQ	CERS	Wed, May 5, 2010	2.80	2.90	2.61	2.80
3332	NASDAQ	CERS	Tue, May 4, 2010	2.96	2.97	2.83	2.83
3331	NASDAQ	CERS	Mon, May 3, 2010	3.24	3.34	2.99	3.00
3330	NASDAQ	CERS	Fri, Apr 30, 2010	3.50	3.50	3.24	3.24
3329	NASDAQ	CERS	Thu, Apr 29, 2010	3.35	3.71	3.35	3.71
3328	NASDAQ	CERS	Wed, Apr 28, 2010	3.24	3.38	3.21	3.35
3327	NASDAQ	CERS	Tue, Apr 27, 2010	3.35	3.40	3.16	3.25
3326	NASDAQ	CERS	Mon, Apr 26, 2010	3.35	3.49	3.27	3.35
3325	NASDAQ	CERS	Fri, Apr 23, 2010	3.26	3.49	3.20	3.36
3324	NASDAQ	CERS	Thu, Apr 22, 2010	3.15	3.25	3.10	3.22
3323	NASDAQ	CERS	Wed, Apr 21, 2010	3.12	3.20	3.05	3.18
3322	NASDAQ	CERS	Tue, Apr 20, 2010	3.22	3.23	3.13	3.15
3321	NASDAQ	CERS	Mon, Apr 19, 2010	3.25	3.25	3.12	3.19
3320	NASDAQ	CERS	Fri, Apr 16, 2010	3.20	3.30	3.10	3.25
3319	NASDAQ	CERS	Thu, Apr 15, 2010	3.14	3.20	3.14	3.20
3318	NASDAQ	CERS	Wed, Apr 14, 2010	3.15	3.20	3.10	3.17
3317	NASDAQ	CERS	Tue, Apr 13, 2010	3.15	3.18	3.06	3.07
3316	NASDAQ	CERS	Mon, Apr 12, 2010	3.10	3.12	3.02	3.10
3315	NASDAQ	CERS	Fri, Apr 9, 2010	3.10	3.18	3.03	3.05
3314	NASDAQ	CERS	Thu, Apr 8, 2010	3.18	3.18	2.99	3.10
3313	NASDAQ	CERS	Wed, Apr 7, 2010	3.10	3.16	3.01	3.16
3312	NASDAQ	CERS	Tue, Apr 6, 2010	3.30	3.35	3.06	3.07
3311	NASDAQ	CERS	Mon, Apr 5, 2010	2.89	3.27	2.85	3.25
3310	NASDAQ	CERS	Thu, Apr 1, 2010	2.84	2.87	2.77	2.83
3309	NASDAQ	CERS	Wed, Mar 31, 2010	2.77	2.87	2.77	2.79
3308	NASDAQ	CERS	Tue, Mar 30, 2010	2.85	2.85	2.68	2.74
3307	NASDAQ	CERS	Mon, Mar 29, 2010	2.92	2.92	2.75	2.81
3306	NASDAQ	CERS	Fri, Mar 26, 2010	2.90	2.94	2.84	2.87
3305	NASDAQ	CERS	Thu, Mar 25, 2010	3.01	3.03	2.85	2.88
3304	NASDAQ	CERS	Wed, Mar 24, 2010	3.01	3.08	2.94	2.95
3303	NASDAQ	CERS	Tue, Mar 23, 2010	2.89	3.05	2.87	2.98
3302	NASDAQ	CERS	Mon, Mar 22, 2010	2.76	2.88	2.68	2.86
3301	NASDAQ	CERS	Fri, Mar 19, 2010	2.90	2.94	2.74	2.74
3300	NASDAQ	CERS	Thu, Mar 18, 2010	2.90	2.95	2.85	2.85
3299	NASDAQ	CERS	Wed, Mar 17, 2010	2.86	2.98	2.86	2.91
3298	NASDAQ	CERS	Tue, Mar 16, 2010	2.80	2.99	2.74	2.85
3297	NASDAQ	CERS	Mon, Mar 15, 2010	3.06	3.06	2.68	2.80
3296	NASDAQ	CERS	Fri, Mar 12, 2010	2.93	3.14	2.85	3.05
3295	NASDAQ	CERS	Thu, Mar 11, 2010	2.65	2.86	2.60	2.85
3294	NASDAQ	CERS	Wed, Mar 10, 2010	2.67	2.72	2.60	2.63
3293	NASDAQ	CERS	Tue, Mar 9, 2010	2.62	2.75	2.51	2.64
3292	NASDAQ	CERS	Mon, Mar 8, 2010	2.31	2.44	2.31	2.36
3291	NASDAQ	CERS	Fri, Mar 5, 2010	2.31	2.36	2.30	2.31
3290	NASDAQ	CERS	Thu, Mar 4, 2010	2.32	2.38	2.28	2.34
3289	NASDAQ	CERS	Wed, Mar 3, 2010	2.42	2.42	2.31	2.34
3288	NASDAQ	CERS	Tue, Mar 2, 2010	2.44	2.44	2.36	2.41
3287	NASDAQ	CERS	Mon, Mar 1, 2010	2.47	2.47	2.28	2.40
3286	NASDAQ	CERS	Fri, Feb 26, 2010	2.20	2.48	2.20	2.45
3285	NASDAQ	CERS	Thu, Feb 25, 2010	2.20	2.21	2.13	2.20
3284	NASDAQ	CERS	Wed, Feb 24, 2010	2.28	2.30	2.15	2.17
3283	NASDAQ	CERS	Tue, Feb 23, 2010	2.21	2.26	2.18	2.25
3282	NASDAQ	CERS	Mon, Feb 22, 2010	2.25	2.33	2.22	2.28
3281	NASDAQ	CERS	Fri, Feb 19, 2010	2.26	2.33	2.20	2.24
3280	NASDAQ	CERS	Thu, Feb 18, 2010	2.39	2.39	2.28	2.30
3279	NASDAQ	CERS	Wed, Feb 17, 2010	2.36	2.45	2.25	2.38
3278	NASDAQ	CERS	Tue, Feb 16, 2010	2.23	2.40	2.21	2.37
3277	NASDAQ	CERS	Fri, Feb 12, 2010	2.10	2.23	2.10	2.23
3276	NASDAQ	CERS	Thu, Feb 11, 2010	2.10	2.19	2.05	2.14
3275	NASDAQ	CERS	Wed, Feb 10, 2010	2.11	2.23	2.01	2.09
3274	NASDAQ	CERS	Tue, Feb 9, 2010	2.24	2.26	2.10	2.11
3273	NASDAQ	CERS	Mon, Feb 8, 2010	1.95	2.08	1.87	2.02
3272	NASDAQ	CERS	Fri, Feb 5, 2010	1.91	1.98	1.85	1.95
3271	NASDAQ	CERS	Thu, Feb 4, 2010	2.03	2.06	1.85	1.89
3270	NASDAQ	CERS	Wed, Feb 3, 2010	1.94	2.07	1.92	2.03
3269	NASDAQ	CERS	Tue, Feb 2, 2010	1.87	1.91	1.83	1.91
3268	NASDAQ	CERS	Mon, Feb 1, 2010	1.82	1.90	1.82	1.89
3267	NASDAQ	CERS	Fri, Jan 29, 2010	1.86	1.91	1.80	1.84
3266	NASDAQ	CERS	Thu, Jan 28, 2010	1.96	1.97	1.84	1.86
3265	NASDAQ	CERS	Wed, Jan 27, 2010	1.95	1.95	1.90	1.90
3264	NASDAQ	CERS	Tue, Jan 26, 2010	1.96	1.97	1.88	1.92
3263	NASDAQ	CERS	Mon, Jan 25, 2010	1.95	2.04	1.95	1.96
3262	NASDAQ	CERS	Fri, Jan 22, 2010	2.08	2.08	1.95	1.95
3261	NASDAQ	CERS	Thu, Jan 21, 2010	2.10	2.10	2.01	2.08
3260	NASDAQ	CERS	Wed, Jan 20, 2010	2.13	2.14	2.04	2.09
3259	NASDAQ	CERS	Tue, Jan 19, 2010	2.14	2.17	2.05	2.12
3258	NASDAQ	CERS	Fri, Jan 15, 2010	2.17	2.22	2.04	2.14
3257	NASDAQ	CERS	Thu, Jan 14, 2010	2.23	2.49	2.12	2.23
3256	NASDAQ	CERS	Wed, Jan 13, 2010	2.05	2.06	1.92	1.97
3255	NASDAQ	CERS	Tue, Jan 12, 2010	2.14	2.16	1.92	2.04
3254	NASDAQ	CERS	Mon, Jan 11, 2010	1.98	2.18	1.97	2.15
3253	NASDAQ	CERS	Fri, Jan 8, 2010	1.94	1.97	1.91	1.96
3252	NASDAQ	CERS	Thu, Jan 7, 2010	1.90	1.90	1.82	1.90
3251	NASDAQ	CERS	Wed, Jan 6, 2010	1.78	1.91	1.78	1.85
3250	NASDAQ	CERS	Tue, Jan 5, 2010	1.86	1.86	1.76	1.78
3249	NASDAQ	CERS	Mon, Jan 4, 2010	1.98	1.98	1.78	1.80
3248	NASDAQ	CERS	Thu, Dec 31, 2009	1.80	1.99	1.80	1.99
3247	NASDAQ	CERS	Wed, Dec 30, 2009	1.80	1.84	1.80	1.82
3246	NASDAQ	CERS	Tue, Dec 29, 2009	1.83	1.86	1.81	1.84
3245	NASDAQ	CERS	Mon, Dec 28, 2009	1.87	1.91	1.83	1.84
3244	NASDAQ	CERS	Thu, Dec 24, 2009	1.87	1.88	1.80	1.85
3243	NASDAQ	CERS	Wed, Dec 23, 2009	1.74	1.89	1.70	1.89
3242	NASDAQ	CERS	Tue, Dec 22, 2009	1.73	1.79	1.65	1.70
3241	NASDAQ	CERS	Mon, Dec 21, 2009	1.71	1.83	1.70	1.72
3240	NASDAQ	CERS	Fri, Dec 18, 2009	1.77	1.77	1.68	1.68
3239	NASDAQ	CERS	Thu, Dec 17, 2009	1.76	1.80	1.74	1.78
3238	NASDAQ	CERS	Wed, Dec 16, 2009	1.80	1.80	1.76	1.76
3237	NASDAQ	CERS	Tue, Dec 15, 2009	1.76	1.80	1.76	1.77
3236	NASDAQ	CERS	Mon, Dec 14, 2009	1.83	1.83	1.76	1.79
3235	NASDAQ	CERS	Fri, Dec 11, 2009	1.80	1.84	1.78	1.83
3234	NASDAQ	CERS	Thu, Dec 10, 2009	1.84	1.86	1.80	1.81
3233	NASDAQ	CERS	Wed, Dec 9, 2009	1.88	1.89	1.78	1.85
3232	NASDAQ	CERS	Tue, Dec 8, 2009	1.91	1.91	1.86	1.89
3231	NASDAQ	CERS	Mon, Dec 7, 2009	1.94	1.94	1.86	1.88
3230	NASDAQ	CERS	Fri, Dec 4, 2009	1.90	1.92	1.85	1.90
3229	NASDAQ	CERS	Thu, Dec 3, 2009	1.93	1.93	1.85	1.88
3228	NASDAQ	CERS	Wed, Dec 2, 2009	1.91	1.98	1.90	1.93
3227	NASDAQ	CERS	Tue, Dec 1, 2009	1.85	1.97	1.85	1.94
3226	NASDAQ	CERS	Mon, Nov 30, 2009	1.90	1.90	1.82	1.82
3225	NASDAQ	CERS	Fri, Nov 27, 2009	1.91	1.91	1.87	1.90
3224	NASDAQ	CERS	Wed, Nov 25, 2009	1.98	1.98	1.92	1.95
3223	NASDAQ	CERS	Tue, Nov 24, 2009	1.94	1.97	1.87	1.95
3222	NASDAQ	CERS	Mon, Nov 23, 2009	2.00	2.00	1.94	1.98
3221	NASDAQ	CERS	Fri, Nov 20, 2009	2.04	2.04	1.95	2.00
3220	NASDAQ	CERS	Thu, Nov 19, 2009	2.12	2.12	1.95	2.03
3219	NASDAQ	CERS	Wed, Nov 18, 2009	2.08	2.11	2.01	2.11
3218	NASDAQ	CERS	Tue, Nov 17, 2009	2.08	2.35	2.00	2.09
3217	NASDAQ	CERS	Mon, Nov 16, 2009	2.75	2.83	2.51	2.56
3216	NASDAQ	CERS	Fri, Nov 13, 2009	2.67	2.79	2.53	2.72
3215	NASDAQ	CERS	Thu, Nov 12, 2009	2.25	2.69	2.25	2.69
3214	NASDAQ	CERS	Wed, Nov 11, 2009	2.18	2.32	2.04	2.21
3213	NASDAQ	CERS	Tue, Nov 10, 2009	2.09	2.14	2.00	2.11
3212	NASDAQ	CERS	Mon, Nov 9, 2009	2.00	2.08	1.95	1.98
3211	NASDAQ	CERS	Fri, Nov 6, 2009	1.89	1.94	1.84	1.94
3210	NASDAQ	CERS	Thu, Nov 5, 2009	1.72	1.89	1.72	1.88
3209	NASDAQ	CERS	Wed, Nov 4, 2009	1.80	1.80	1.72	1.74
3208	NASDAQ	CERS	Tue, Nov 3, 2009	1.64	1.83	1.64	1.81
3207	NASDAQ	CERS	Mon, Nov 2, 2009	1.74	1.74	1.57	1.64
3206	NASDAQ	CERS	Fri, Oct 30, 2009	1.86	1.92	1.67	1.68
3205	NASDAQ	CERS	Thu, Oct 29, 2009	1.85	2.04	1.80	1.96
3204	NASDAQ	CERS	Wed, Oct 28, 2009	1.94	1.94	1.79	1.82
3203	NASDAQ	CERS	Tue, Oct 27, 2009	1.99	2.05	1.80	1.99
3202	NASDAQ	CERS	Mon, Oct 26, 2009	2.03	2.08	1.91	1.92
3201	NASDAQ	CERS	Fri, Oct 23, 2009	2.15	2.15	2.02	2.03
3200	NASDAQ	CERS	Thu, Oct 22, 2009	2.25	2.25	2.09	2.16
3199	NASDAQ	CERS	Wed, Oct 21, 2009	2.23	2.25	2.20	2.23
3198	NASDAQ	CERS	Tue, Oct 20, 2009	2.24	2.27	2.20	2.26
3197	NASDAQ	CERS	Mon, Oct 19, 2009	2.27	2.28	2.22	2.28
3196	NASDAQ	CERS	Fri, Oct 16, 2009	2.29	2.30	2.25	2.28
3195	NASDAQ	CERS	Thu, Oct 15, 2009	2.29	2.31	2.22	2.31
3194	NASDAQ	CERS	Wed, Oct 14, 2009	2.34	2.34	2.22	2.31
3193	NASDAQ	CERS	Tue, Oct 13, 2009	2.25	2.30	2.20	2.30
3192	NASDAQ	CERS	Mon, Oct 12, 2009	2.26	2.30	2.20	2.25
3191	NASDAQ	CERS	Fri, Oct 9, 2009	2.21	2.26	2.15	2.23
3190	NASDAQ	CERS	Thu, Oct 8, 2009	2.22	2.23	2.18	2.20
3189	NASDAQ	CERS	Wed, Oct 7, 2009	2.20	2.22	2.16	2.20
3188	NASDAQ	CERS	Tue, Oct 6, 2009	2.29	2.29	2.18	2.25
3187	NASDAQ	CERS	Mon, Oct 5, 2009	2.18	2.28	2.16	2.27
3186	NASDAQ	CERS	Fri, Oct 2, 2009	2.14	2.20	2.09	2.20
3185	NASDAQ	CERS	Thu, Oct 1, 2009	2.20	2.22	2.08	2.15
3184	NASDAQ	CERS	Wed, Sep 30, 2009	2.36	2.36	2.16	2.19
3183	NASDAQ	CERS	Tue, Sep 29, 2009	2.40	2.51	2.23	2.31
3182	NASDAQ	CERS	Mon, Sep 28, 2009	2.07	2.24	2.07	2.20
3181	NASDAQ	CERS	Fri, Sep 25, 2009	2.11	2.17	2.08	2.08
3180	NASDAQ	CERS	Thu, Sep 24, 2009	2.30	2.30	2.10	2.11
3179	NASDAQ	CERS	Wed, Sep 23, 2009	2.29	2.36	2.25	2.28
3178	NASDAQ	CERS	Tue, Sep 22, 2009	2.29	2.31	2.26	2.29
3177	NASDAQ	CERS	Mon, Sep 21, 2009	2.27	2.39	2.25	2.31
3176	NASDAQ	CERS	Fri, Sep 18, 2009	2.32	2.36	2.21	2.34
3175	NASDAQ	CERS	Thu, Sep 17, 2009	2.25	2.59	2.24	2.34
3174	NASDAQ	CERS	Wed, Sep 16, 2009	2.04	2.11	2.04	2.09
3173	NASDAQ	CERS	Tue, Sep 15, 2009	2.12	2.12	2.04	2.04
3172	NASDAQ	CERS	Mon, Sep 14, 2009	2.18	2.18	2.06	2.14
3171	NASDAQ	CERS	Fri, Sep 11, 2009	2.18	2.29	2.11	2.18
3170	NASDAQ	CERS	Thu, Sep 10, 2009	2.19	2.19	2.13	2.15
3169	NASDAQ	CERS	Wed, Sep 9, 2009	2.07	2.20	2.06	2.18
3168	NASDAQ	CERS	Tue, Sep 8, 2009	2.08	2.11	2.00	2.09
3167	NASDAQ	CERS	Fri, Sep 4, 2009	2.03	2.10	1.97	2.02
3166	NASDAQ	CERS	Thu, Sep 3, 2009	2.00	2.06	1.96	2.03
3165	NASDAQ	CERS	Wed, Sep 2, 2009	1.95	2.04	1.90	1.98
3164	NASDAQ	CERS	Tue, Sep 1, 2009	2.13	2.19	1.95	1.97
3163	NASDAQ	CERS	Mon, Aug 31, 2009	2.12	2.20	2.08	2.11
3162	NASDAQ	CERS	Fri, Aug 28, 2009	2.21	2.21	2.11	2.13
3161	NASDAQ	CERS	Thu, Aug 27, 2009	2.22	2.25	2.11	2.15
3160	NASDAQ	CERS	Wed, Aug 26, 2009	2.24	2.40	2.15	2.18
3159	NASDAQ	CERS	Tue, Aug 25, 2009	2.11	2.11	2.02	2.05
3158	NASDAQ	CERS	Mon, Aug 24, 2009	2.12	2.13	2.03	2.11
3157	NASDAQ	CERS	Fri, Aug 21, 2009	2.20	2.24	2.02	2.07
3156	NASDAQ	CERS	Thu, Aug 20, 2009	2.48	2.50	2.04	2.10
3155	NASDAQ	CERS	Wed, Aug 19, 2009	2.31	3.57	2.17	2.88
3154	NASDAQ	CERS	Tue, Aug 18, 2009	1.78	1.80	1.72	1.79
3153	NASDAQ	CERS	Mon, Aug 17, 2009	1.80	1.83	1.75	1.81
3152	NASDAQ	CERS	Fri, Aug 14, 2009	1.90	1.92	1.75	1.86
3151	NASDAQ	CERS	Thu, Aug 13, 2009	1.90	1.92	1.81	1.90
3150	NASDAQ	CERS	Wed, Aug 12, 2009	1.92	2.03	1.85	1.85
3149	NASDAQ	CERS	Tue, Aug 11, 2009	2.11	2.11	1.85	1.96
3148	NASDAQ	CERS	Mon, Aug 10, 2009	1.79	2.15	1.75	2.07
3147	NASDAQ	CERS	Fri, Aug 7, 2009	1.66	1.85	1.60	1.79
3146	NASDAQ	CERS	Thu, Aug 6, 2009	1.70	1.70	1.60	1.70
3145	NASDAQ	CERS	Wed, Aug 5, 2009	1.66	1.75	1.60	1.75
3144	NASDAQ	CERS	Tue, Aug 4, 2009	1.64	1.72	1.62	1.68
3143	NASDAQ	CERS	Mon, Aug 3, 2009	1.73	1.84	1.70	1.77
3142	NASDAQ	CERS	Fri, Jul 31, 2009	1.85	1.88	1.60	1.67
3141	NASDAQ	CERS	Thu, Jul 30, 2009	1.88	2.13	1.85	1.91
3140	NASDAQ	CERS	Wed, Jul 29, 2009	2.20	2.25	1.75	1.94
3139	NASDAQ	CERS	Tue, Jul 28, 2009	2.84	2.88	2.16	2.30
3138	NASDAQ	CERS	Mon, Jul 27, 2009	2.49	3.00	2.10	2.98
3137	NASDAQ	CERS	Fri, Jul 24, 2009	2.06	2.35	1.95	2.05
3136	NASDAQ	CERS	Thu, Jul 23, 2009	1.25	1.95	1.21	1.80
3135	NASDAQ	CERS	Wed, Jul 22, 2009	1.13	1.21	1.09	1.21
3134	NASDAQ	CERS	Tue, Jul 21, 2009	1.16	1.21	1.09	1.15
3133	NASDAQ	CERS	Mon, Jul 20, 2009	1.05	1.16	1.03	1.14
3132	NASDAQ	CERS	Fri, Jul 17, 2009	1.00	1.05	0.95	1.04
3131	NASDAQ	CERS	Thu, Jul 16, 2009	0.94	1.04	0.94	0.95
3130	NASDAQ	CERS	Wed, Jul 15, 2009	0.98	0.98	0.95	0.96
3129	NASDAQ	CERS	Tue, Jul 14, 2009	0.97	1.00	0.94	0.98
3128	NASDAQ	CERS	Mon, Jul 13, 2009	0.91	0.98	0.90	0.93
3127	NASDAQ	CERS	Fri, Jul 10, 2009	0.88	0.88	0.85	0.87
3126	NASDAQ	CERS	Thu, Jul 9, 2009	0.83	0.90	0.83	0.88
3125	NASDAQ	CERS	Wed, Jul 8, 2009	0.92	0.92	0.81	0.86
3124	NASDAQ	CERS	Tue, Jul 7, 2009	0.93	1.00	0.92	0.93
3123	NASDAQ	CERS	Mon, Jul 6, 2009	0.95	0.95	0.91	0.92
3122	NASDAQ	CERS	Thu, Jul 2, 2009	0.97	0.97	0.95	0.97
3121	NASDAQ	CERS	Wed, Jul 1, 2009	0.98	1.05	0.95	0.95
3120	NASDAQ	CERS	Tue, Jun 30, 2009	0.91	1.03	0.91	1.03
3119	NASDAQ	CERS	Mon, Jun 29, 2009	0.97	0.97	0.90	0.90
3118	NASDAQ	CERS	Fri, Jun 26, 2009	0.96	1.01	0.92	1.01
3117	NASDAQ	CERS	Thu, Jun 25, 2009	1.00	1.00	0.90	0.95
3116	NASDAQ	CERS	Wed, Jun 24, 2009	0.88	1.03	0.86	1.01
3115	NASDAQ	CERS	Tue, Jun 23, 2009	0.98	1.01	0.85	0.89
3114	NASDAQ	CERS	Mon, Jun 22, 2009	1.03	1.03	0.98	1.02
3113	NASDAQ	CERS	Fri, Jun 19, 2009	1.02	1.06	1.01	1.02
3112	NASDAQ	CERS	Thu, Jun 18, 2009	1.01	1.06	1.00	1.04
3111	NASDAQ	CERS	Wed, Jun 17, 2009	1.07	1.07	0.98	1.01
3110	NASDAQ	CERS	Tue, Jun 16, 2009	1.10	1.10	1.06	1.07
3109	NASDAQ	CERS	Mon, Jun 15, 2009	1.09	1.09	1.05	1.06
3108	NASDAQ	CERS	Fri, Jun 12, 2009	1.15	1.15	1.08	1.08
3107	NASDAQ	CERS	Thu, Jun 11, 2009	1.08	1.15	1.08	1.15
3106	NASDAQ	CERS	Wed, Jun 10, 2009	1.18	1.18	1.08	1.13
3105	NASDAQ	CERS	Tue, Jun 9, 2009	1.10	1.14	1.09	1.14
3104	NASDAQ	CERS	Mon, Jun 8, 2009	1.06	1.14	1.05	1.14
3103	NASDAQ	CERS	Fri, Jun 5, 2009	1.14	1.14	1.08	1.10
3102	NASDAQ	CERS	Thu, Jun 4, 2009	1.06	1.14	1.02	1.14
3101	NASDAQ	CERS	Wed, Jun 3, 2009	1.16	1.19	1.06	1.06
3100	NASDAQ	CERS	Tue, Jun 2, 2009	1.22	1.22	1.11	1.18
3099	NASDAQ	CERS	Mon, Jun 1, 2009	1.27	1.27	1.14	1.17
3098	NASDAQ	CERS	Fri, May 29, 2009	1.20	1.24	1.10	1.24
3097	NASDAQ	CERS	Thu, May 28, 2009	1.09	1.25	1.05	1.20
3096	NASDAQ	CERS	Wed, May 27, 2009	1.00	1.03	0.99	1.03
3095	NASDAQ	CERS	Tue, May 26, 2009	1.07	1.07	0.98	1.02
3094	NASDAQ	CERS	Fri, May 22, 2009	1.08	1.08	0.98	1.08
3093	NASDAQ	CERS	Thu, May 21, 2009	1.01	1.07	0.97	1.07
3092	NASDAQ	CERS	Wed, May 20, 2009	1.05	1.07	1.01	1.01
3091	NASDAQ	CERS	Tue, May 19, 2009	1.05	1.07	1.01	1.01
3090	NASDAQ	CERS	Mon, May 18, 2009	1.00	1.10	0.99	1.01
3089	NASDAQ	CERS	Fri, May 15, 2009	1.06	1.15	0.97	0.99
3088	NASDAQ	CERS	Thu, May 14, 2009	1.02	1.06	1.00	1.04
3087	NASDAQ	CERS	Wed, May 13, 2009	1.05	1.08	1.01	1.02
3086	NASDAQ	CERS	Tue, May 12, 2009	1.10	1.10	1.01	1.02
3085	NASDAQ	CERS	Mon, May 11, 2009	1.00	1.10	1.00	1.09
3084	NASDAQ	CERS	Fri, May 8, 2009	1.04	1.10	0.97	0.97
3083	NASDAQ	CERS	Thu, May 7, 2009	1.10	1.11	1.02	1.04
3082	NASDAQ	CERS	Wed, May 6, 2009	1.09	1.10	1.00	1.10
3081	NASDAQ	CERS	Tue, May 5, 2009	0.96	1.09	0.95	1.09
3080	NASDAQ	CERS	Mon, May 4, 2009	0.91	1.04	0.90	0.96
3079	NASDAQ	CERS	Fri, May 1, 2009	1.10	1.10	0.90	1.05
3078	NASDAQ	CERS	Thu, Apr 30, 2009	1.28	1.30	1.08	1.17
3077	NASDAQ	CERS	Wed, Apr 29, 2009	1.42	1.45	1.25	1.29
3076	NASDAQ	CERS	Tue, Apr 28, 2009	1.44	1.47	1.36	1.38
3075	NASDAQ	CERS	Mon, Apr 27, 2009	1.50	1.50	1.20	1.34
3074	NASDAQ	CERS	Fri, Apr 24, 2009	1.10	1.10	1.02	1.09
3073	NASDAQ	CERS	Thu, Apr 23, 2009	1.20	1.20	1.03	1.06
3072	NASDAQ	CERS	Wed, Apr 22, 2009	1.15	1.19	1.12	1.16
3071	NASDAQ	CERS	Tue, Apr 21, 2009	1.10	1.20	1.06	1.11
3070	NASDAQ	CERS	Mon, Apr 20, 2009	1.05	1.05	0.99	1.02
3069	NASDAQ	CERS	Fri, Apr 17, 2009	0.93	1.00	0.92	0.95
3068	NASDAQ	CERS	Thu, Apr 16, 2009	0.89	0.94	0.89	0.92
3067	NASDAQ	CERS	Wed, Apr 15, 2009	0.95	0.95	0.85	0.87
3066	NASDAQ	CERS	Tue, Apr 14, 2009	1.04	1.08	0.91	0.92
3065	NASDAQ	CERS	Mon, Apr 13, 2009	0.88	1.04	0.88	1.01
3064	NASDAQ	CERS	Thu, Apr 9, 2009	0.81	0.87	0.79	0.87
3063	NASDAQ	CERS	Wed, Apr 8, 2009	0.80	0.81	0.78	0.79
3062	NASDAQ	CERS	Tue, Apr 7, 2009	0.68	0.79	0.67	0.78
3061	NASDAQ	CERS	Mon, Apr 6, 2009	0.64	0.68	0.64	0.67
3060	NASDAQ	CERS	Fri, Apr 3, 2009	0.64	0.67	0.64	0.64
3059	NASDAQ	CERS	Thu, Apr 2, 2009	0.66	0.70	0.66	0.67
3058	NASDAQ	CERS	Wed, Apr 1, 2009	0.68	0.68	0.63	0.68
3057	NASDAQ	CERS	Tue, Mar 31, 2009	0.68	0.68	0.63	0.68
3056	NASDAQ	CERS	Mon, Mar 30, 2009	0.67	0.67	0.65	0.66
3055	NASDAQ	CERS	Fri, Mar 27, 2009	0.66	0.67	0.63	0.64
3054	NASDAQ	CERS	Thu, Mar 26, 2009	0.64	0.67	0.60	0.67
3053	NASDAQ	CERS	Wed, Mar 25, 2009	0.63	0.68	0.62	0.65
3052	NASDAQ	CERS	Tue, Mar 24, 2009	0.65	0.66	0.61	0.63
3051	NASDAQ	CERS	Mon, Mar 23, 2009	0.70	0.70	0.64	0.65
3050	NASDAQ	CERS	Fri, Mar 20, 2009	0.78	0.78	0.67	0.67
3049	NASDAQ	CERS	Thu, Mar 19, 2009	0.83	0.83	0.73	0.75
3048	NASDAQ	CERS	Wed, Mar 18, 2009	0.81	0.83	0.74	0.80
3047	NASDAQ	CERS	Tue, Mar 17, 2009	0.81	0.83	0.78	0.81
3046	NASDAQ	CERS	Mon, Mar 16, 2009	0.83	0.84	0.77	0.84
3045	NASDAQ	CERS	Fri, Mar 13, 2009	0.81	0.85	0.75	0.83
3044	NASDAQ	CERS	Thu, Mar 12, 2009	0.77	0.80	0.75	0.80
3043	NASDAQ	CERS	Wed, Mar 11, 2009	0.70	0.79	0.70	0.72
3042	NASDAQ	CERS	Tue, Mar 10, 2009	0.75	0.79	0.74	0.77
3041	NASDAQ	CERS	Mon, Mar 9, 2009	0.75	0.78	0.75	0.77
3040	NASDAQ	CERS	Fri, Mar 6, 2009	0.68	0.73	0.68	0.71
3039	NASDAQ	CERS	Thu, Mar 5, 2009	0.77	0.77	0.68	0.68
3038	NASDAQ	CERS	Wed, Mar 4, 2009	0.73	0.77	0.68	0.76
3037	NASDAQ	CERS	Tue, Mar 3, 2009	0.68	0.75	0.68	0.72
3036	NASDAQ	CERS	Mon, Mar 2, 2009	0.71	0.74	0.68	0.72
3035	NASDAQ	CERS	Fri, Feb 27, 2009	0.83	0.83	0.70	0.74
3034	NASDAQ	CERS	Thu, Feb 26, 2009	0.74	0.83	0.73	0.80
3033	NASDAQ	CERS	Wed, Feb 25, 2009	0.85	0.87	0.72	0.72
3032	NASDAQ	CERS	Tue, Feb 24, 2009	0.72	0.85	0.70	0.85
3031	NASDAQ	CERS	Mon, Feb 23, 2009	0.65	0.71	0.65	0.68
3030	NASDAQ	CERS	Fri, Feb 20, 2009	0.78	0.78	0.59	0.62
3029	NASDAQ	CERS	Thu, Feb 19, 2009	0.70	0.77	0.68	0.72
3028	NASDAQ	CERS	Wed, Feb 18, 2009	0.80	0.80	0.67	0.75
3027	NASDAQ	CERS	Tue, Feb 17, 2009	0.81	0.81	0.68	0.76
3026	NASDAQ	CERS	Fri, Feb 13, 2009	0.70	0.79	0.67	0.79
3025	NASDAQ	CERS	Thu, Feb 12, 2009	0.74	0.75	0.68	0.71
3024	NASDAQ	CERS	Wed, Feb 11, 2009	0.73	0.77	0.70	0.70
3023	NASDAQ	CERS	Tue, Feb 10, 2009	0.81	0.86	0.73	0.74
3022	NASDAQ	CERS	Mon, Feb 9, 2009	0.89	0.89	0.81	0.84
3021	NASDAQ	CERS	Fri, Feb 6, 2009	0.89	0.90	0.78	0.90
3020	NASDAQ	CERS	Thu, Feb 5, 2009	0.81	0.84	0.77	0.83
3019	NASDAQ	CERS	Wed, Feb 4, 2009	0.81	0.86	0.77	0.78
3018	NASDAQ	CERS	Tue, Feb 3, 2009	0.89	0.89	0.76	0.77
3017	NASDAQ	CERS	Mon, Feb 2, 2009	0.97	0.97	0.88	0.91
3016	NASDAQ	CERS	Fri, Jan 30, 2009	0.96	0.98	0.89	0.94
3015	NASDAQ	CERS	Thu, Jan 29, 2009	0.99	0.99	0.95	0.96
3014	NASDAQ	CERS	Wed, Jan 28, 2009	1.02	1.03	0.93	0.94
3013	NASDAQ	CERS	Tue, Jan 27, 2009	0.98	1.00	0.91	0.98
3012	NASDAQ	CERS	Mon, Jan 26, 2009	1.01	1.05	0.85	0.91
3011	NASDAQ	CERS	Fri, Jan 23, 2009	0.98	0.99	0.95	0.96
3010	NASDAQ	CERS	Thu, Jan 22, 2009	1.00	1.02	0.95	0.96
3009	NASDAQ	CERS	Wed, Jan 21, 2009	0.95	0.99	0.91	0.97
3008	NASDAQ	CERS	Tue, Jan 20, 2009	1.12	1.12	0.90	0.95
3007	NASDAQ	CERS	Fri, Jan 16, 2009	1.00	1.10	0.96	1.07
3006	NASDAQ	CERS	Thu, Jan 15, 2009	0.88	0.97	0.83	0.96
3005	NASDAQ	CERS	Wed, Jan 14, 2009	0.96	0.96	0.83	0.84
3004	NASDAQ	CERS	Tue, Jan 13, 2009	0.82	0.96	0.80	0.93
3003	NASDAQ	CERS	Mon, Jan 12, 2009	0.86	0.88	0.78	0.79
3002	NASDAQ	CERS	Fri, Jan 9, 2009	0.80	0.88	0.77	0.86
3001	NASDAQ	CERS	Thu, Jan 8, 2009	0.80	0.80	0.76	0.80
3000	NASDAQ	CERS	Wed, Jan 7, 2009	0.82	0.82	0.74	0.78
2999	NASDAQ	CERS	Tue, Jan 6, 2009	0.86	0.86	0.76	0.79
2998	NASDAQ	CERS	Mon, Jan 5, 2009	0.80	0.87	0.80	0.85
2997	NASDAQ	CERS	Fri, Jan 2, 2009	0.70	0.82	0.69	0.82
2996	NASDAQ	CERS	Wed, Dec 31, 2008	0.70	0.70	0.64	0.70
2995	NASDAQ	CERS	Tue, Dec 30, 2008	0.70	0.70	0.62	0.63
2994	NASDAQ	CERS	Mon, Dec 29, 2008	0.70	0.70	0.64	0.67
2993	NASDAQ	CERS	Fri, Dec 26, 2008	0.73	0.73	0.64	0.68
2992	NASDAQ	CERS	Wed, Dec 24, 2008	0.63	0.73	0.63	0.70
2991	NASDAQ	CERS	Tue, Dec 23, 2008	0.72	0.79	0.66	0.73
2990	NASDAQ	CERS	Mon, Dec 22, 2008	0.80	0.89	0.70	0.76
2989	NASDAQ	CERS	Fri, Dec 19, 2008	0.63	0.74	0.60	0.70
2988	NASDAQ	CERS	Thu, Dec 18, 2008	0.65	0.67	0.62	0.63
2987	NASDAQ	CERS	Wed, Dec 17, 2008	0.60	0.62	0.55	0.60
2986	NASDAQ	CERS	Tue, Dec 16, 2008	0.73	0.75	0.57	0.58
2985	NASDAQ	CERS	Mon, Dec 15, 2008	0.70	0.75	0.65	0.70
2984	NASDAQ	CERS	Fri, Dec 12, 2008	0.60	0.68	0.60	0.68
2983	NASDAQ	CERS	Thu, Dec 11, 2008	0.57	0.76	0.57	0.68
2982	NASDAQ	CERS	Wed, Dec 10, 2008	0.88	0.88	0.70	0.71
2981	NASDAQ	CERS	Tue, Dec 9, 2008	0.93	0.93	0.83	0.88
2980	NASDAQ	CERS	Mon, Dec 8, 2008	0.95	0.99	0.85	0.92
2979	NASDAQ	CERS	Fri, Dec 5, 2008	0.91	0.94	0.88	0.94
2978	NASDAQ	CERS	Thu, Dec 4, 2008	0.88	0.94	0.85	0.89
2977	NASDAQ	CERS	Wed, Dec 3, 2008	0.95	1.01	0.88	0.94
2976	NASDAQ	CERS	Tue, Dec 2, 2008	1.03	1.03	0.98	1.01
2975	NASDAQ	CERS	Mon, Dec 1, 2008	1.05	1.05	0.96	1.01
2974	NASDAQ	CERS	Fri, Nov 28, 2008	1.05	1.05	0.96	1.05
2973	NASDAQ	CERS	Wed, Nov 26, 2008	0.94	1.05	0.89	1.04
2972	NASDAQ	CERS	Tue, Nov 25, 2008	0.94	0.98	0.89	0.92
2971	NASDAQ	CERS	Mon, Nov 24, 2008	1.00	1.03	0.88	0.89
2970	NASDAQ	CERS	Fri, Nov 21, 2008	1.02	1.02	0.90	0.97
2969	NASDAQ	CERS	Thu, Nov 20, 2008	1.14	1.14	0.94	0.95
2968	NASDAQ	CERS	Wed, Nov 19, 2008	1.25	1.25	1.02	1.08
2967	NASDAQ	CERS	Tue, Nov 18, 2008	1.28	1.28	1.14	1.22
2966	NASDAQ	CERS	Mon, Nov 17, 2008	1.20	1.28	1.19	1.27
2965	NASDAQ	CERS	Fri, Nov 14, 2008	1.24	1.26	1.19	1.26
2964	NASDAQ	CERS	Thu, Nov 13, 2008	1.22	1.25	1.15	1.24
2963	NASDAQ	CERS	Wed, Nov 12, 2008	1.24	1.28	1.07	1.19
2962	NASDAQ	CERS	Tue, Nov 11, 2008	1.10	1.26	1.05	1.21
2961	NASDAQ	CERS	Mon, Nov 10, 2008	1.11	1.16	1.05	1.10
2960	NASDAQ	CERS	Fri, Nov 7, 2008	1.18	1.19	1.00	1.09
2959	NASDAQ	CERS	Thu, Nov 6, 2008	0.95	1.13	0.81	1.10
2958	NASDAQ	CERS	Wed, Nov 5, 2008	1.27	1.33	0.81	0.90
2957	NASDAQ	CERS	Tue, Nov 4, 2008	1.65	1.75	1.25	1.26
2956	NASDAQ	CERS	Mon, Nov 3, 2008	1.89	1.89	1.56	1.57
2955	NASDAQ	CERS	Fri, Oct 31, 2008	1.79	1.84	1.61	1.83
2954	NASDAQ	CERS	Thu, Oct 30, 2008	1.99	2.00	1.76	1.87
2953	NASDAQ	CERS	Wed, Oct 29, 2008	2.03	2.03	1.89	1.91
2952	NASDAQ	CERS	Tue, Oct 28, 2008	2.01	2.08	1.90	1.92
2951	NASDAQ	CERS	Mon, Oct 27, 2008	2.01	2.16	1.93	1.99
2950	NASDAQ	CERS	Fri, Oct 24, 2008	2.05	2.17	1.91	2.11
2949	NASDAQ	CERS	Thu, Oct 23, 2008	2.54	2.55	2.08	2.12
2948	NASDAQ	CERS	Wed, Oct 22, 2008	2.74	2.78	2.39	2.44
2947	NASDAQ	CERS	Tue, Oct 21, 2008	2.90	3.01	2.74	2.78
2946	NASDAQ	CERS	Mon, Oct 20, 2008	2.66	3.13	2.61	3.00
2945	NASDAQ	CERS	Fri, Oct 17, 2008	2.21	3.46	2.21	2.56
2944	NASDAQ	CERS	Thu, Oct 16, 2008	2.47	2.82	2.06	2.19
2943	NASDAQ	CERS	Wed, Oct 15, 2008	2.77	2.90	2.23	2.47
2942	NASDAQ	CERS	Tue, Oct 14, 2008	2.81	2.98	2.78	2.80
2941	NASDAQ	CERS	Mon, Oct 13, 2008	2.50	2.93	2.27	2.68
2940	NASDAQ	CERS	Fri, Oct 10, 2008	2.93	3.01	2.28	2.33
2939	NASDAQ	CERS	Thu, Oct 9, 2008	3.28	3.73	3.11	3.13
2938	NASDAQ	CERS	Wed, Oct 8, 2008	3.17	3.43	2.86	3.17
2937	NASDAQ	CERS	Tue, Oct 7, 2008	3.61	3.61	3.23	3.25
2936	NASDAQ	CERS	Mon, Oct 6, 2008	3.94	4.07	3.47	3.58
2935	NASDAQ	CERS	Fri, Oct 3, 2008	4.11	4.33	3.99	3.99
2934	NASDAQ	CERS	Thu, Oct 2, 2008	4.24	4.36	4.04	4.13
2933	NASDAQ	CERS	Wed, Oct 1, 2008	4.16	4.37	4.16	4.19
2932	NASDAQ	CERS	Tue, Sep 30, 2008	4.25	4.44	4.08	4.13
2931	NASDAQ	CERS	Mon, Sep 29, 2008	4.00	4.38	3.95	4.20
2930	NASDAQ	CERS	Fri, Sep 26, 2008	4.09	4.26	3.81	4.21
2929	NASDAQ	CERS	Thu, Sep 25, 2008	4.50	4.87	4.10	4.23
2928	NASDAQ	CERS	Wed, Sep 24, 2008	5.00	5.01	4.53	4.54
2927	NASDAQ	CERS	Tue, Sep 23, 2008	4.45	5.02	4.45	5.02
2926	NASDAQ	CERS	Mon, Sep 22, 2008	4.69	4.74	4.33	4.61
2925	NASDAQ	CERS	Fri, Sep 19, 2008	4.33	4.77	4.18	4.65
2924	NASDAQ	CERS	Thu, Sep 18, 2008	3.75	4.30	3.60	4.28
2923	NASDAQ	CERS	Wed, Sep 17, 2008	3.76	3.90	3.67	3.74
2922	NASDAQ	CERS	Tue, Sep 16, 2008	3.60	3.85	3.60	3.84
2921	NASDAQ	CERS	Mon, Sep 15, 2008	3.60	3.81	3.60	3.61
2920	NASDAQ	CERS	Fri, Sep 12, 2008	3.46	3.61	3.20	3.60
2919	NASDAQ	CERS	Thu, Sep 11, 2008	3.78	3.85	3.39	3.46
2918	NASDAQ	CERS	Wed, Sep 10, 2008	3.93	3.96	3.75	3.86
2917	NASDAQ	CERS	Tue, Sep 9, 2008	4.16	4.22	3.83	3.85
2916	NASDAQ	CERS	Mon, Sep 8, 2008	4.34	4.41	4.10	4.20
2915	NASDAQ	CERS	Fri, Sep 5, 2008	4.36	4.45	4.22	4.30
2914	NASDAQ	CERS	Thu, Sep 4, 2008	4.33	4.47	4.33	4.41
2913	NASDAQ	CERS	Wed, Sep 3, 2008	4.37	4.49	4.33	4.47
2912	NASDAQ	CERS	Tue, Sep 2, 2008	4.48	4.51	4.35	4.43
2911	NASDAQ	CERS	Fri, Aug 29, 2008	4.42	4.51	4.42	4.46
2910	NASDAQ	CERS	Thu, Aug 28, 2008	4.38	4.50	4.37	4.44
2909	NASDAQ	CERS	Wed, Aug 27, 2008	4.41	4.59	4.32	4.38
2908	NASDAQ	CERS	Tue, Aug 26, 2008	4.51	4.60	4.40	4.50
2907	NASDAQ	CERS	Mon, Aug 25, 2008	4.52	4.64	4.37	4.52
2906	NASDAQ	CERS	Fri, Aug 22, 2008	4.51	4.63	4.45	4.50
2905	NASDAQ	CERS	Thu, Aug 21, 2008	4.54	4.56	4.32	4.53
2904	NASDAQ	CERS	Wed, Aug 20, 2008	4.62	4.83	4.49	4.52
2903	NASDAQ	CERS	Tue, Aug 19, 2008	4.61	4.76	4.53	4.59
2902	NASDAQ	CERS	Mon, Aug 18, 2008	4.76	4.81	4.60	4.72
2901	NASDAQ	CERS	Fri, Aug 15, 2008	4.70	4.88	4.64	4.71
2900	NASDAQ	CERS	Thu, Aug 14, 2008	4.55	4.73	4.52	4.69
2899	NASDAQ	CERS	Wed, Aug 13, 2008	4.46	4.59	4.32	4.59
2898	NASDAQ	CERS	Tue, Aug 12, 2008	4.60	4.60	4.34	4.50
2897	NASDAQ	CERS	Mon, Aug 11, 2008	4.50	4.64	4.30	4.58
2896	NASDAQ	CERS	Fri, Aug 8, 2008	4.05	4.49	4.05	4.45
2895	NASDAQ	CERS	Thu, Aug 7, 2008	4.32	4.33	3.93	4.05
2894	NASDAQ	CERS	Wed, Aug 6, 2008	4.34	4.47	4.21	4.37
2893	NASDAQ	CERS	Tue, Aug 5, 2008	4.38	4.52	4.23	4.38
2892	NASDAQ	CERS	Mon, Aug 4, 2008	4.74	4.74	4.26	4.29
2891	NASDAQ	CERS	Fri, Aug 1, 2008	5.07	5.19	4.61	4.78
2890	NASDAQ	CERS	Thu, Jul 31, 2008	4.93	5.17	4.88	5.07
2889	NASDAQ	CERS	Wed, Jul 30, 2008	4.57	4.85	4.57	4.81
2888	NASDAQ	CERS	Tue, Jul 29, 2008	5.05	5.08	4.52	4.57
2887	NASDAQ	CERS	Mon, Jul 28, 2008	5.01	5.35	5.01	5.09
2886	NASDAQ	CERS	Fri, Jul 25, 2008	5.20	5.20	5.00	5.11
2885	NASDAQ	CERS	Thu, Jul 24, 2008	5.26	5.35	5.07	5.13
2884	NASDAQ	CERS	Wed, Jul 23, 2008	5.00	5.33	4.66	5.13
2883	NASDAQ	CERS	Tue, Jul 22, 2008	5.12	5.24	5.02	5.09
2882	NASDAQ	CERS	Mon, Jul 21, 2008	5.10	5.33	4.79	5.18
2881	NASDAQ	CERS	Fri, Jul 18, 2008	4.93	5.25	4.59	5.13
2880	NASDAQ	CERS	Thu, Jul 17, 2008	4.56	4.95	4.54	4.92
2879	NASDAQ	CERS	Wed, Jul 16, 2008	4.32	4.58	4.14	4.51
2878	NASDAQ	CERS	Tue, Jul 15, 2008	4.41	4.64	4.27	4.32
2877	NASDAQ	CERS	Mon, Jul 14, 2008	4.48	4.53	4.34	4.41
2876	NASDAQ	CERS	Fri, Jul 11, 2008	4.50	4.50	4.22	4.39
2875	NASDAQ	CERS	Thu, Jul 10, 2008	4.69	4.69	4.35	4.48
2874	NASDAQ	CERS	Wed, Jul 9, 2008	4.66	4.66	4.57	4.60
2873	NASDAQ	CERS	Tue, Jul 8, 2008	4.43	4.78	4.38	4.70
2872	NASDAQ	CERS	Mon, Jul 7, 2008	4.58	4.62	4.38	4.45
2871	NASDAQ	CERS	Thu, Jul 3, 2008	4.70	4.72	4.49	4.59
2870	NASDAQ	CERS	Wed, Jul 2, 2008	4.31	4.79	4.31	4.64
2869	NASDAQ	CERS	Tue, Jul 1, 2008	4.09	4.31	4.09	4.27
2868	NASDAQ	CERS	Mon, Jun 30, 2008	4.58	4.65	4.09	4.09
2867	NASDAQ	CERS	Fri, Jun 27, 2008	4.50	4.61	4.41	4.54
2866	NASDAQ	CERS	Thu, Jun 26, 2008	4.48	4.58	4.28	4.52
2865	NASDAQ	CERS	Wed, Jun 25, 2008	4.23	4.54	4.09	4.47
2864	NASDAQ	CERS	Tue, Jun 24, 2008	4.43	4.46	4.18	4.20
2863	NASDAQ	CERS	Mon, Jun 23, 2008	4.65	4.70	4.38	4.41
2862	NASDAQ	CERS	Fri, Jun 20, 2008	4.69	4.72	4.46	4.60
2861	NASDAQ	CERS	Thu, Jun 19, 2008	4.89	4.89	4.65	4.75
2860	NASDAQ	CERS	Wed, Jun 18, 2008	4.90	4.94	4.71	4.75
2859	NASDAQ	CERS	Tue, Jun 17, 2008	4.84	5.15	4.77	4.89
2858	NASDAQ	CERS	Mon, Jun 16, 2008	4.70	4.88	4.70	4.81
2857	NASDAQ	CERS	Fri, Jun 13, 2008	4.96	5.02	4.58	4.68
2856	NASDAQ	CERS	Thu, Jun 12, 2008	5.16	5.20	4.83	4.86
2855	NASDAQ	CERS	Wed, Jun 11, 2008	5.20	5.22	5.06	5.16
2854	NASDAQ	CERS	Tue, Jun 10, 2008	4.97	5.06	4.88	4.98
2853	NASDAQ	CERS	Mon, Jun 9, 2008	5.18	5.28	4.90	5.00
2852	NASDAQ	CERS	Fri, Jun 6, 2008	5.19	5.27	5.09	5.10
2851	NASDAQ	CERS	Thu, Jun 5, 2008	5.32	5.32	5.10	5.19
2850	NASDAQ	CERS	Wed, Jun 4, 2008	5.27	5.41	5.21	5.35
2849	NASDAQ	CERS	Tue, Jun 3, 2008	5.10	5.28	4.96	5.27
2848	NASDAQ	CERS	Mon, Jun 2, 2008	4.95	5.08	4.88	5.05
2847	NASDAQ	CERS	Fri, May 30, 2008	5.07	5.18	4.87	4.94
2846	NASDAQ	CERS	Thu, May 29, 2008	4.94	5.12	4.91	5.03
2845	NASDAQ	CERS	Wed, May 28, 2008	4.86	4.99	4.86	4.92
2844	NASDAQ	CERS	Tue, May 27, 2008	4.92	4.97	4.71	4.81
2843	NASDAQ	CERS	Fri, May 23, 2008	5.15	5.15	4.53	4.89
2842	NASDAQ	CERS	Thu, May 22, 2008	5.25	5.27	5.09	5.14
2841	NASDAQ	CERS	Wed, May 21, 2008	5.23	5.32	5.02	5.26
2840	NASDAQ	CERS	Tue, May 20, 2008	5.17	5.38	5.16	5.25
2839	NASDAQ	CERS	Mon, May 19, 2008	5.24	5.38	5.15	5.16
2838	NASDAQ	CERS	Fri, May 16, 2008	5.24	5.27	5.15	5.27
2837	NASDAQ	CERS	Thu, May 15, 2008	5.44	5.49	5.15	5.19
2836	NASDAQ	CERS	Wed, May 14, 2008	5.50	5.58	5.41	5.42
2835	NASDAQ	CERS	Tue, May 13, 2008	5.56	5.56	5.31	5.52
2834	NASDAQ	CERS	Mon, May 12, 2008	5.54	5.57	5.41	5.51
2833	NASDAQ	CERS	Fri, May 9, 2008	5.52	5.57	5.38	5.50
2832	NASDAQ	CERS	Thu, May 8, 2008	5.46	5.67	5.35	5.59
2831	NASDAQ	CERS	Wed, May 7, 2008	6.00	6.00	5.45	5.46
2830	NASDAQ	CERS	Tue, May 6, 2008	5.74	6.01	5.63	6.01
2829	NASDAQ	CERS	Mon, May 5, 2008	5.53	5.82	5.45	5.77
2828	NASDAQ	CERS	Fri, May 2, 2008	6.00	6.13	5.25	5.57
2827	NASDAQ	CERS	Thu, May 1, 2008	6.30	6.70	6.20	6.30
2826	NASDAQ	CERS	Wed, Apr 30, 2008	6.54	6.79	5.98	6.23
2825	NASDAQ	CERS	Tue, Apr 29, 2008	6.82	6.83	6.51	6.61
2824	NASDAQ	CERS	Mon, Apr 28, 2008	6.07	6.82	6.06	6.78
2823	NASDAQ	CERS	Fri, Apr 25, 2008	5.89	6.11	5.76	6.09
2822	NASDAQ	CERS	Thu, Apr 24, 2008	6.14	6.14	5.88	5.91
2821	NASDAQ	CERS	Wed, Apr 23, 2008	6.37	6.47	6.08	6.12
2820	NASDAQ	CERS	Tue, Apr 22, 2008	6.76	6.77	6.36	6.37
2819	NASDAQ	CERS	Mon, Apr 21, 2008	6.54	6.86	6.42	6.76
2818	NASDAQ	CERS	Fri, Apr 18, 2008	6.44	6.58	6.15	6.45
2817	NASDAQ	CERS	Thu, Apr 17, 2008	6.35	6.45	6.24	6.26
2816	NASDAQ	CERS	Wed, Apr 16, 2008	6.54	6.68	6.31	6.38
2815	NASDAQ	CERS	Tue, Apr 15, 2008	6.35	6.52	6.34	6.52
2814	NASDAQ	CERS	Mon, Apr 14, 2008	6.77	7.00	6.45	6.56
2813	NASDAQ	CERS	Fri, Apr 11, 2008	7.03	7.12	6.68	6.76
2812	NASDAQ	CERS	Thu, Apr 10, 2008	6.63	7.17	6.63	7.07
2811	NASDAQ	CERS	Wed, Apr 9, 2008	6.86	6.88	6.54	6.67
2810	NASDAQ	CERS	Tue, Apr 8, 2008	6.81	6.94	6.66	6.86
2809	NASDAQ	CERS	Mon, Apr 7, 2008	7.23	7.23	6.66	6.80
2808	NASDAQ	CERS	Fri, Apr 4, 2008	6.71	7.24	6.71	7.24
2807	NASDAQ	CERS	Thu, Apr 3, 2008	6.51	6.68	6.50	6.65
2806	NASDAQ	CERS	Wed, Apr 2, 2008	6.33	6.57	6.25	6.51
2805	NASDAQ	CERS	Tue, Apr 1, 2008	5.79	6.40	5.79	6.40
2804	NASDAQ	CERS	Mon, Mar 31, 2008	5.95	6.06	5.70	5.77
2803	NASDAQ	CERS	Fri, Mar 28, 2008	6.04	6.33	5.83	6.07
2802	NASDAQ	CERS	Thu, Mar 27, 2008	5.75	6.20	5.75	6.04
2801	NASDAQ	CERS	Wed, Mar 26, 2008	5.12	5.88	5.12	5.80
2800	NASDAQ	CERS	Tue, Mar 25, 2008	5.09	5.18	4.99	5.11
2799	NASDAQ	CERS	Mon, Mar 24, 2008	4.79	5.20	4.68	5.05
2798	NASDAQ	CERS	Thu, Mar 20, 2008	4.56	4.89	4.34	4.87
2797	NASDAQ	CERS	Wed, Mar 19, 2008	4.50	4.87	4.46	4.84
2796	NASDAQ	CERS	Tue, Mar 18, 2008	4.44	4.52	4.25	4.51
2795	NASDAQ	CERS	Mon, Mar 17, 2008	4.38	4.54	4.18	4.37
2794	NASDAQ	CERS	Fri, Mar 14, 2008	4.80	4.80	4.37	4.50
2793	NASDAQ	CERS	Thu, Mar 13, 2008	4.70	4.85	4.52	4.80
2792	NASDAQ	CERS	Wed, Mar 12, 2008	4.94	4.98	4.69	4.72
2791	NASDAQ	CERS	Tue, Mar 11, 2008	4.96	5.01	4.74	4.91
2790	NASDAQ	CERS	Mon, Mar 10, 2008	5.15	5.18	4.82	4.86
2789	NASDAQ	CERS	Fri, Mar 7, 2008	5.34	5.46	5.01	5.10
2788	NASDAQ	CERS	Thu, Mar 6, 2008	5.66	5.74	5.39	5.41
2787	NASDAQ	CERS	Wed, Mar 5, 2008	5.81	5.81	5.65	5.72
2786	NASDAQ	CERS	Tue, Mar 4, 2008	6.05	6.13	5.63	5.81
2785	NASDAQ	CERS	Mon, Mar 3, 2008	6.22	6.24	5.94	6.07
2784	NASDAQ	CERS	Fri, Feb 29, 2008	6.11	6.28	6.07	6.25
2783	NASDAQ	CERS	Thu, Feb 28, 2008	6.18	6.26	6.09	6.20
2782	NASDAQ	CERS	Wed, Feb 27, 2008	6.13	6.30	6.13	6.20
2781	NASDAQ	CERS	Tue, Feb 26, 2008	6.06	6.34	6.06	6.21
2780	NASDAQ	CERS	Mon, Feb 25, 2008	6.07	6.34	5.93	6.20
2779	NASDAQ	CERS	Fri, Feb 22, 2008	5.93	6.13	5.80	6.03
2778	NASDAQ	CERS	Thu, Feb 21, 2008	5.75	5.99	5.60	5.73
2777	NASDAQ	CERS	Wed, Feb 20, 2008	5.83	6.02	5.65	5.84
2776	NASDAQ	CERS	Tue, Feb 19, 2008	6.05	6.09	5.85	6.03
2775	NASDAQ	CERS	Fri, Feb 15, 2008	6.31	6.50	5.85	6.00
2774	NASDAQ	CERS	Thu, Feb 14, 2008	6.55	6.69	6.24	6.40
2773	NASDAQ	CERS	Wed, Feb 13, 2008	6.30	6.81	6.20	6.62
2772	NASDAQ	CERS	Tue, Feb 12, 2008	6.42	6.42	6.20	6.29
2771	NASDAQ	CERS	Mon, Feb 11, 2008	6.21	6.50	6.12	6.43
2770	NASDAQ	CERS	Fri, Feb 8, 2008	6.20	6.35	6.11	6.23
2769	NASDAQ	CERS	Thu, Feb 7, 2008	6.22	6.38	6.15	6.20
2768	NASDAQ	CERS	Wed, Feb 6, 2008	6.28	6.34	6.15	6.15
2767	NASDAQ	CERS	Tue, Feb 5, 2008	6.30	6.51	6.18	6.21
2766	NASDAQ	CERS	Mon, Feb 4, 2008	6.42	6.52	6.26	6.39
2765	NASDAQ	CERS	Fri, Feb 1, 2008	6.30	6.32	6.15	6.27
2764	NASDAQ	CERS	Thu, Jan 31, 2008	6.10	6.31	6.09	6.30
2763	NASDAQ	CERS	Wed, Jan 30, 2008	6.26	6.29	6.03	6.15
2762	NASDAQ	CERS	Tue, Jan 29, 2008	6.25	6.31	6.13	6.27
2761	NASDAQ	CERS	Mon, Jan 28, 2008	6.14	6.22	6.06	6.22
2760	NASDAQ	CERS	Fri, Jan 25, 2008	6.11	6.21	5.96	6.18
2759	NASDAQ	CERS	Thu, Jan 24, 2008	6.14	6.37	5.93	6.01
2758	NASDAQ	CERS	Wed, Jan 23, 2008	6.27	6.38	6.05	6.15
2757	NASDAQ	CERS	Tue, Jan 22, 2008	6.29	6.59	6.17	6.44
2756	NASDAQ	CERS	Fri, Jan 18, 2008	6.35	6.48	6.09	6.47
2755	NASDAQ	CERS	Thu, Jan 17, 2008	6.82	6.89	6.38	6.45
2754	NASDAQ	CERS	Wed, Jan 16, 2008	6.77	6.99	6.65	6.74
2753	NASDAQ	CERS	Tue, Jan 15, 2008	6.78	7.05	6.67	6.82
2752	NASDAQ	CERS	Mon, Jan 14, 2008	6.90	6.97	6.67	6.83
2751	NASDAQ	CERS	Fri, Jan 11, 2008	7.09	7.29	6.83	6.87
2750	NASDAQ	CERS	Thu, Jan 10, 2008	6.87	7.21	6.75	7.17
2749	NASDAQ	CERS	Wed, Jan 9, 2008	6.37	7.02	6.29	6.99
2748	NASDAQ	CERS	Tue, Jan 8, 2008	6.45	6.62	6.30	6.42
2747	NASDAQ	CERS	Mon, Jan 7, 2008	6.31	6.58	6.31	6.56
2746	NASDAQ	CERS	Fri, Jan 4, 2008	6.28	6.44	6.25	6.33
2745	NASDAQ	CERS	Thu, Jan 3, 2008	6.63	6.63	6.23	6.31
2744	NASDAQ	CERS	Wed, Jan 2, 2008	6.51	6.68	6.42	6.56
2743	NASDAQ	CERS	Mon, Dec 31, 2007	6.69	6.83	6.50	6.51
2742	NASDAQ	CERS	Fri, Dec 28, 2007	6.59	6.90	6.50	6.75
2741	NASDAQ	CERS	Thu, Dec 27, 2007	6.88	6.95	6.55	6.56
2740	NASDAQ	CERS	Wed, Dec 26, 2007	6.70	7.00	6.67	6.93
2739	NASDAQ	CERS	Mon, Dec 24, 2007	6.52	6.79	6.46	6.75
2738	NASDAQ	CERS	Fri, Dec 21, 2007	6.58	6.58	6.45	6.51
2737	NASDAQ	CERS	Thu, Dec 20, 2007	6.54	6.61	6.43	6.53
2736	NASDAQ	CERS	Wed, Dec 19, 2007	6.33	6.57	6.31	6.52
2735	NASDAQ	CERS	Tue, Dec 18, 2007	6.51	6.69	6.17	6.37
2734	NASDAQ	CERS	Mon, Dec 17, 2007	6.94	7.03	6.46	6.48
2733	NASDAQ	CERS	Fri, Dec 14, 2007	6.64	7.09	6.63	7.00
2732	NASDAQ	CERS	Thu, Dec 13, 2007	6.58	6.73	6.58	6.73
2731	NASDAQ	CERS	Wed, Dec 12, 2007	6.81	6.88	6.61	6.68
2730	NASDAQ	CERS	Tue, Dec 11, 2007	6.86	6.98	6.64	6.73
2729	NASDAQ	CERS	Mon, Dec 10, 2007	6.96	6.98	6.80	6.87
2728	NASDAQ	CERS	Fri, Dec 7, 2007	6.99	7.00	6.80	6.98
2727	NASDAQ	CERS	Thu, Dec 6, 2007	6.82	6.97	6.75	6.94
2726	NASDAQ	CERS	Wed, Dec 5, 2007	6.81	6.99	6.73	6.86
2725	NASDAQ	CERS	Tue, Dec 4, 2007	6.56	7.00	6.54	6.88
2724	NASDAQ	CERS	Mon, Dec 3, 2007	7.60	7.60	6.31	6.63
2723	NASDAQ	CERS	Fri, Nov 30, 2007	7.72	7.78	7.42	7.72
2722	NASDAQ	CERS	Thu, Nov 29, 2007	7.52	7.78	7.44	7.64
2721	NASDAQ	CERS	Wed, Nov 28, 2007	7.40	7.60	7.15	7.57
2720	NASDAQ	CERS	Tue, Nov 27, 2007	7.35	7.42	7.21	7.38
2719	NASDAQ	CERS	Mon, Nov 26, 2007	7.57	7.79	7.25	7.30
2718	NASDAQ	CERS	Fri, Nov 23, 2007	7.73	7.75	7.54	7.59
2717	NASDAQ	CERS	Wed, Nov 21, 2007	8.15	8.17	7.70	7.71
2716	NASDAQ	CERS	Tue, Nov 20, 2007	8.00	8.33	7.98	8.14
2715	NASDAQ	CERS	Mon, Nov 19, 2007	8.20	8.22	7.93	8.08
2714	NASDAQ	CERS	Fri, Nov 16, 2007	8.44	8.57	8.13	8.24
2713	NASDAQ	CERS	Thu, Nov 15, 2007	8.95	8.96	8.30	8.38
2712	NASDAQ	CERS	Wed, Nov 14, 2007	9.31	9.47	8.93	8.94
2711	NASDAQ	CERS	Tue, Nov 13, 2007	9.00	9.27	8.84	9.22
2710	NASDAQ	CERS	Mon, Nov 12, 2007	9.03	9.17	8.93	8.96
2709	NASDAQ	CERS	Fri, Nov 9, 2007	9.05	9.16	8.83	9.06
2708	NASDAQ	CERS	Thu, Nov 8, 2007	9.46	9.50	9.04	9.20
2707	NASDAQ	CERS	Wed, Nov 7, 2007	9.63	9.64	9.29	9.38
2706	NASDAQ	CERS	Tue, Nov 6, 2007	9.31	9.79	9.31	9.74
2705	NASDAQ	CERS	Mon, Nov 5, 2007	9.11	9.33	9.05	9.31
2704	NASDAQ	CERS	Fri, Nov 2, 2007	8.92	9.18	8.80	9.17
2703	NASDAQ	CERS	Thu, Nov 1, 2007	8.99	9.12	8.73	8.82
2702	NASDAQ	CERS	Wed, Oct 31, 2007	8.74	9.33	8.74	9.00
2701	NASDAQ	CERS	Tue, Oct 30, 2007	8.93	8.95	8.73	8.80
2700	NASDAQ	CERS	Mon, Oct 29, 2007	8.85	9.06	8.80	8.88
2699	NASDAQ	CERS	Fri, Oct 26, 2007	9.12	9.17	8.80	8.90
2698	NASDAQ	CERS	Thu, Oct 25, 2007	9.07	9.27	8.92	9.09
2697	NASDAQ	CERS	Wed, Oct 24, 2007	9.03	9.15	8.90	9.02
2696	NASDAQ	CERS	Tue, Oct 23, 2007	8.97	9.39	8.97	9.11
2695	NASDAQ	CERS	Mon, Oct 22, 2007	9.04	9.35	9.03	9.26
2694	NASDAQ	CERS	Fri, Oct 19, 2007	9.36	9.55	9.11	9.12
2693	NASDAQ	CERS	Thu, Oct 18, 2007	9.60	9.70	9.37	9.41
2692	NASDAQ	CERS	Wed, Oct 17, 2007	9.76	9.89	9.58	9.70
2691	NASDAQ	CERS	Tue, Oct 16, 2007	9.70	9.87	9.66	9.71
2690	NASDAQ	CERS	Mon, Oct 15, 2007	10.22	10.29	9.70	9.75
2689	NASDAQ	CERS	Fri, Oct 12, 2007	9.40	10.20	9.26	10.18
2688	NASDAQ	CERS	Thu, Oct 11, 2007	9.04	9.50	9.04	9.16
2687	NASDAQ	CERS	Wed, Oct 10, 2007	9.60	9.60	9.11	9.25
2686	NASDAQ	CERS	Tue, Oct 9, 2007	9.92	10.06	9.56	9.64
2685	NASDAQ	CERS	Mon, Oct 8, 2007	9.66	10.00	9.53	9.96
2684	NASDAQ	CERS	Fri, Oct 5, 2007	9.36	9.93	9.25	9.64
2683	NASDAQ	CERS	Thu, Oct 4, 2007	9.31	9.57	9.30	9.32
2682	NASDAQ	CERS	Wed, Oct 3, 2007	9.23	9.50	9.13	9.26
2681	NASDAQ	CERS	Tue, Oct 2, 2007	8.85	9.50	8.81	9.33
2680	NASDAQ	CERS	Mon, Oct 1, 2007	8.71	8.89	8.64	8.81
2679	NASDAQ	CERS	Fri, Sep 28, 2007	8.73	9.08	8.56	8.73
2678	NASDAQ	CERS	Thu, Sep 27, 2007	8.01	8.78	8.01	8.76
2677	NASDAQ	CERS	Wed, Sep 26, 2007	7.83	8.06	7.72	8.00
2676	NASDAQ	CERS	Tue, Sep 25, 2007	7.37	8.09	7.37	7.83
2675	NASDAQ	CERS	Mon, Sep 24, 2007	7.18	7.50	7.18	7.37
2674	NASDAQ	CERS	Fri, Sep 21, 2007	7.06	7.47	7.06	7.23
2673	NASDAQ	CERS	Thu, Sep 20, 2007	7.19	7.30	7.06	7.06
2672	NASDAQ	CERS	Wed, Sep 19, 2007	7.26	7.35	7.00	7.19
2671	NASDAQ	CERS	Tue, Sep 18, 2007	7.31	7.35	7.17	7.27
2670	NASDAQ	CERS	Mon, Sep 17, 2007	7.30	7.35	7.20	7.28
2669	NASDAQ	CERS	Fri, Sep 14, 2007	7.33	7.41	7.23	7.37
2668	NASDAQ	CERS	Thu, Sep 13, 2007	7.48	7.50	7.37	7.43
2667	NASDAQ	CERS	Wed, Sep 12, 2007	7.29	7.64	7.29	7.43
2666	NASDAQ	CERS	Tue, Sep 11, 2007	7.52	7.73	7.33	7.54
2665	NASDAQ	CERS	Mon, Sep 10, 2007	7.56	7.56	7.28	7.55
2664	NASDAQ	CERS	Fri, Sep 7, 2007	7.20	7.60	7.18	7.52
2663	NASDAQ	CERS	Thu, Sep 6, 2007	7.07	7.42	7.07	7.33
2662	NASDAQ	CERS	Wed, Sep 5, 2007	6.98	7.12	6.94	7.05
2661	NASDAQ	CERS	Tue, Sep 4, 2007	6.89	7.10	6.79	7.05
2660	NASDAQ	CERS	Fri, Aug 31, 2007	6.92	7.04	6.86	6.92
2659	NASDAQ	CERS	Thu, Aug 30, 2007	6.94	6.98	6.79	6.83
2658	NASDAQ	CERS	Wed, Aug 29, 2007	6.92	6.95	6.81	6.95
2657	NASDAQ	CERS	Tue, Aug 28, 2007	6.63	7.22	6.62	6.87
2656	NASDAQ	CERS	Mon, Aug 27, 2007	6.83	6.87	6.61	6.72
2655	NASDAQ	CERS	Fri, Aug 24, 2007	6.83	6.95	6.75	6.89
2654	NASDAQ	CERS	Thu, Aug 23, 2007	7.13	7.21	6.82	6.88
2653	NASDAQ	CERS	Wed, Aug 22, 2007	7.32	7.39	7.19	7.28
2652	NASDAQ	CERS	Tue, Aug 21, 2007	6.87	7.31	6.83	7.30
2651	NASDAQ	CERS	Mon, Aug 20, 2007	7.07	7.15	6.97	7.02
2650	NASDAQ	CERS	Fri, Aug 17, 2007	6.92	7.16	6.90	7.03
2649	NASDAQ	CERS	Thu, Aug 16, 2007	6.65	6.95	6.51	6.84
2648	NASDAQ	CERS	Wed, Aug 15, 2007	6.85	7.03	6.66	6.73
2647	NASDAQ	CERS	Tue, Aug 14, 2007	6.91	7.09	6.80	6.84
2646	NASDAQ	CERS	Mon, Aug 13, 2007	7.34	7.34	6.61	6.94
2645	NASDAQ	CERS	Fri, Aug 10, 2007	7.88	7.88	7.29	7.33
2644	NASDAQ	CERS	Thu, Aug 9, 2007	7.56	8.24	7.52	7.98
2643	NASDAQ	CERS	Wed, Aug 8, 2007	6.93	7.97	6.88	7.68
2642	NASDAQ	CERS	Tue, Aug 7, 2007	6.48	7.00	6.48	6.90
2641	NASDAQ	CERS	Mon, Aug 6, 2007	6.28	6.59	6.26	6.53
2640	NASDAQ	CERS	Fri, Aug 3, 2007	6.55	6.60	6.26	6.36
2639	NASDAQ	CERS	Thu, Aug 2, 2007	6.38	6.70	6.30	6.59
2638	NASDAQ	CERS	Wed, Aug 1, 2007	6.35	6.65	6.32	6.39
2637	NASDAQ	CERS	Tue, Jul 31, 2007	6.25	6.38	6.08	6.36
2636	NASDAQ	CERS	Mon, Jul 30, 2007	6.26	6.41	6.10	6.16
2635	NASDAQ	CERS	Fri, Jul 27, 2007	6.25	6.51	6.18	6.30
2634	NASDAQ	CERS	Thu, Jul 26, 2007	6.16	6.29	6.06	6.25
2633	NASDAQ	CERS	Wed, Jul 25, 2007	6.19	6.24	6.05	6.18
2632	NASDAQ	CERS	Tue, Jul 24, 2007	6.13	6.28	6.12	6.16
2631	NASDAQ	CERS	Mon, Jul 23, 2007	6.33	6.38	6.09	6.17
2630	NASDAQ	CERS	Fri, Jul 20, 2007	6.34	6.43	6.26	6.28
2629	NASDAQ	CERS	Thu, Jul 19, 2007	6.48	6.67	6.35	6.37
2628	NASDAQ	CERS	Wed, Jul 18, 2007	6.40	6.56	6.25	6.46
2627	NASDAQ	CERS	Tue, Jul 17, 2007	6.67	6.67	6.40	6.45
2626	NASDAQ	CERS	Mon, Jul 16, 2007	6.71	6.80	6.64	6.69
2625	NASDAQ	CERS	Fri, Jul 13, 2007	6.75	6.79	6.62	6.74
2624	NASDAQ	CERS	Thu, Jul 12, 2007	6.86	6.92	6.74	6.75
2623	NASDAQ	CERS	Wed, Jul 11, 2007	6.76	6.82	6.59	6.79
2622	NASDAQ	CERS	Tue, Jul 10, 2007	6.92	6.97	6.66	6.71
2621	NASDAQ	CERS	Mon, Jul 9, 2007	7.11	7.22	6.89	6.94
2620	NASDAQ	CERS	Fri, Jul 6, 2007	6.85	7.16	6.82	7.10
2619	NASDAQ	CERS	Thu, Jul 5, 2007	6.84	7.04	6.81	6.82
2618	NASDAQ	CERS	Tue, Jul 3, 2007	6.84	6.95	6.77	6.85
2617	NASDAQ	CERS	Mon, Jul 2, 2007	6.76	6.92	6.74	6.86
2616	NASDAQ	CERS	Fri, Jun 29, 2007	6.79	6.95	6.73	6.76
2615	NASDAQ	CERS	Thu, Jun 28, 2007	6.56	6.79	6.56	6.75
2614	NASDAQ	CERS	Wed, Jun 27, 2007	6.30	6.64	6.30	6.60
2613	NASDAQ	CERS	Tue, Jun 26, 2007	6.59	6.60	6.29	6.36
2612	NASDAQ	CERS	Mon, Jun 25, 2007	6.45	6.59	6.38	6.48
2611	NASDAQ	CERS	Fri, Jun 22, 2007	6.20	6.49	6.05	6.47
2610	NASDAQ	CERS	Thu, Jun 21, 2007	6.09	6.19	6.04	6.19
2609	NASDAQ	CERS	Wed, Jun 20, 2007	6.20	6.26	6.07	6.11
2608	NASDAQ	CERS	Tue, Jun 19, 2007	6.13	6.25	6.00	6.21
2607	NASDAQ	CERS	Mon, Jun 18, 2007	6.16	6.22	6.13	6.18
2606	NASDAQ	CERS	Fri, Jun 15, 2007	6.49	6.49	6.08	6.17
2605	NASDAQ	CERS	Thu, Jun 14, 2007	6.21	6.43	6.19	6.39
2604	NASDAQ	CERS	Wed, Jun 13, 2007	6.21	6.25	6.01	6.23
2603	NASDAQ	CERS	Tue, Jun 12, 2007	6.10	6.39	5.94	6.21
2602	NASDAQ	CERS	Mon, Jun 11, 2007	6.40	6.40	6.15	6.15
2601	NASDAQ	CERS	Fri, Jun 8, 2007	6.07	6.42	6.07	6.41
2600	NASDAQ	CERS	Thu, Jun 7, 2007	6.25	6.31	6.00	6.11
2599	NASDAQ	CERS	Wed, Jun 6, 2007	6.31	6.38	6.25	6.31
2598	NASDAQ	CERS	Tue, Jun 5, 2007	6.39	6.43	6.29	6.36
2597	NASDAQ	CERS	Mon, Jun 4, 2007	6.33	6.45	6.21	6.40
2596	NASDAQ	CERS	Fri, Jun 1, 2007	6.22	6.50	6.22	6.35
2595	NASDAQ	CERS	Thu, May 31, 2007	6.00	6.32	5.89	6.22
2594	NASDAQ	CERS	Wed, May 30, 2007	5.94	6.09	5.81	6.08
2593	NASDAQ	CERS	Tue, May 29, 2007	5.85	5.98	5.85	5.96
2592	NASDAQ	CERS	Fri, May 25, 2007	5.70	5.88	5.63	5.83
2591	NASDAQ	CERS	Thu, May 24, 2007	5.92	5.94	5.55	5.64
2590	NASDAQ	CERS	Wed, May 23, 2007	6.16	6.17	5.88	5.91
2589	NASDAQ	CERS	Tue, May 22, 2007	6.13	6.27	5.99	6.14
2588	NASDAQ	CERS	Mon, May 21, 2007	5.83	6.15	5.80	6.10
2587	NASDAQ	CERS	Fri, May 18, 2007	5.55	5.86	5.48	5.80
2586	NASDAQ	CERS	Thu, May 17, 2007	5.12	5.55	5.12	5.50
2585	NASDAQ	CERS	Wed, May 16, 2007	5.30	5.43	5.11	5.13
2584	NASDAQ	CERS	Tue, May 15, 2007	5.43	5.59	5.30	5.31
2583	NASDAQ	CERS	Mon, May 14, 2007	5.66	5.75	5.40	5.42
2582	NASDAQ	CERS	Fri, May 11, 2007	5.61	5.69	5.53	5.63
2581	NASDAQ	CERS	Thu, May 10, 2007	5.65	5.65	5.47	5.54
2580	NASDAQ	CERS	Wed, May 9, 2007	5.82	5.85	5.64	5.67
2579	NASDAQ	CERS	Tue, May 8, 2007	6.05	6.06	5.81	5.89
2578	NASDAQ	CERS	Mon, May 7, 2007	6.31	6.31	6.05	6.09
2577	NASDAQ	CERS	Fri, May 4, 2007	6.48	6.48	6.19	6.33
2576	NASDAQ	CERS	Thu, May 3, 2007	6.50	6.53	6.37	6.48
2575	NASDAQ	CERS	Wed, May 2, 2007	7.02	7.44	6.31	6.47
2574	NASDAQ	CERS	Tue, May 1, 2007	7.34	7.54	6.60	7.44
2573	NASDAQ	CERS	Mon, Apr 30, 2007	7.95	7.95	7.32	7.44
2572	NASDAQ	CERS	Fri, Apr 27, 2007	7.93	8.11	7.80	7.92
2571	NASDAQ	CERS	Thu, Apr 26, 2007	7.77	8.00	7.75	7.94
2570	NASDAQ	CERS	Wed, Apr 25, 2007	7.82	7.94	7.63	7.67
2569	NASDAQ	CERS	Tue, Apr 24, 2007	7.55	7.79	7.47	7.75
2568	NASDAQ	CERS	Mon, Apr 23, 2007	7.63	7.72	7.42	7.55
2567	NASDAQ	CERS	Fri, Apr 20, 2007	7.48	7.73	7.40	7.68
2566	NASDAQ	CERS	Thu, Apr 19, 2007	7.66	7.66	7.40	7.44
2565	NASDAQ	CERS	Wed, Apr 18, 2007	7.71	7.92	7.40	7.56
2564	NASDAQ	CERS	Tue, Apr 17, 2007	7.52	7.74	7.47	7.67
2563	NASDAQ	CERS	Mon, Apr 16, 2007	7.57	7.65	7.45	7.48
2562	NASDAQ	CERS	Fri, Apr 13, 2007	7.50	7.71	7.40	7.47
2561	NASDAQ	CERS	Thu, Apr 12, 2007	7.15	7.54	7.13	7.46
2560	NASDAQ	CERS	Wed, Apr 11, 2007	7.34	7.34	7.12	7.18
2559	NASDAQ	CERS	Tue, Apr 10, 2007	7.27	7.36	7.25	7.30
2558	NASDAQ	CERS	Mon, Apr 9, 2007	7.31	7.34	7.15	7.24
2557	NASDAQ	CERS	Thu, Apr 5, 2007	7.17	7.42	7.14	7.31
2556	NASDAQ	CERS	Wed, Apr 4, 2007	7.13	7.23	7.08	7.17
2555	NASDAQ	CERS	Tue, Apr 3, 2007	6.97	7.21	6.88	7.11
2554	NASDAQ	CERS	Mon, Apr 2, 2007	6.66	6.94	6.65	6.93
2553	NASDAQ	CERS	Fri, Mar 30, 2007	6.96	7.02	6.73	6.75
2552	NASDAQ	CERS	Thu, Mar 29, 2007	6.89	6.90	6.71	6.81
2551	NASDAQ	CERS	Wed, Mar 28, 2007	6.68	6.88	6.59	6.82
2550	NASDAQ	CERS	Tue, Mar 27, 2007	6.58	6.66	6.53	6.63
2549	NASDAQ	CERS	Mon, Mar 26, 2007	6.64	6.69	6.56	6.61
2548	NASDAQ	CERS	Fri, Mar 23, 2007	6.75	6.78	6.59	6.67
2547	NASDAQ	CERS	Thu, Mar 22, 2007	6.80	6.80	6.67	6.77
2546	NASDAQ	CERS	Wed, Mar 21, 2007	6.75	6.86	6.70	6.80
2545	NASDAQ	CERS	Tue, Mar 20, 2007	6.65	6.90	6.60	6.73
2544	NASDAQ	CERS	Mon, Mar 19, 2007	6.66	6.85	6.58	6.63
2543	NASDAQ	CERS	Fri, Mar 16, 2007	6.42	6.68	6.35	6.58
2542	NASDAQ	CERS	Thu, Mar 15, 2007	6.41	6.52	6.38	6.43
2541	NASDAQ	CERS	Wed, Mar 14, 2007	6.51	6.55	6.33	6.39
2540	NASDAQ	CERS	Tue, Mar 13, 2007	6.35	6.78	6.33	6.38
2539	NASDAQ	CERS	Mon, Mar 12, 2007	6.43	6.52	6.31	6.41
2538	NASDAQ	CERS	Fri, Mar 9, 2007	6.50	6.70	6.30	6.41
2537	NASDAQ	CERS	Thu, Mar 8, 2007	6.73	6.75	6.31	6.46
2536	NASDAQ	CERS	Wed, Mar 7, 2007	5.75	6.69	5.67	6.61
2535	NASDAQ	CERS	Tue, Mar 6, 2007	5.56	5.73	5.49	5.60
2534	NASDAQ	CERS	Mon, Mar 5, 2007	5.81	5.83	5.47	5.50
2533	NASDAQ	CERS	Fri, Mar 2, 2007	5.74	5.99	5.68	5.86
2532	NASDAQ	CERS	Thu, Mar 1, 2007	5.64	5.74	5.42	5.73
2531	NASDAQ	CERS	Wed, Feb 28, 2007	5.35	5.65	5.30	5.34
2530	NASDAQ	CERS	Tue, Feb 27, 2007	5.78	5.87	5.35	5.37
2529	NASDAQ	CERS	Mon, Feb 26, 2007	6.11	6.12	5.75	5.82
2528	NASDAQ	CERS	Fri, Feb 23, 2007	6.37	6.37	5.86	6.03
2527	NASDAQ	CERS	Thu, Feb 22, 2007	5.74	5.76	5.57	5.74
2526	NASDAQ	CERS	Wed, Feb 21, 2007	5.82	5.90	5.65	5.71
2525	NASDAQ	CERS	Tue, Feb 20, 2007	5.70	5.89	5.70	5.84
2524	NASDAQ	CERS	Fri, Feb 16, 2007	5.52	5.83	5.45	5.73
2523	NASDAQ	CERS	Thu, Feb 15, 2007	5.65	5.71	5.46	5.52
2522	NASDAQ	CERS	Wed, Feb 14, 2007	5.62	5.83	5.61	5.63
2521	NASDAQ	CERS	Tue, Feb 13, 2007	5.69	5.79	5.60	5.63
2520	NASDAQ	CERS	Mon, Feb 12, 2007	5.69	5.84	5.65	5.68
2519	NASDAQ	CERS	Fri, Feb 9, 2007	5.79	5.80	5.56	5.65
2518	NASDAQ	CERS	Thu, Feb 8, 2007	5.99	6.10	5.81	5.83
2517	NASDAQ	CERS	Wed, Feb 7, 2007	5.95	6.22	5.83	6.05
2516	NASDAQ	CERS	Tue, Feb 6, 2007	6.32	6.33	5.84	5.92
2515	NASDAQ	CERS	Mon, Feb 5, 2007	6.40	6.56	6.25	6.28
2514	NASDAQ	CERS	Fri, Feb 2, 2007	6.10	6.50	6.08	6.31
2513	NASDAQ	CERS	Thu, Feb 1, 2007	5.82	6.19	5.82	6.10
2512	NASDAQ	CERS	Wed, Jan 31, 2007	5.71	5.89	5.70	5.80
2511	NASDAQ	CERS	Tue, Jan 30, 2007	5.71	5.82	5.61	5.73
2510	NASDAQ	CERS	Mon, Jan 29, 2007	5.68	5.75	5.52	5.67
2509	NASDAQ	CERS	Fri, Jan 26, 2007	5.50	5.62	5.32	5.42
2508	NASDAQ	CERS	Thu, Jan 25, 2007	5.68	5.74	5.39	5.47
2507	NASDAQ	CERS	Wed, Jan 24, 2007	5.70	5.85	5.59	5.73
2506	NASDAQ	CERS	Tue, Jan 23, 2007	5.63	5.71	5.51	5.67
2505	NASDAQ	CERS	Mon, Jan 22, 2007	5.80	5.84	5.61	5.63
2504	NASDAQ	CERS	Fri, Jan 19, 2007	5.62	6.06	5.62	5.82
2503	NASDAQ	CERS	Thu, Jan 18, 2007	5.76	5.79	5.60	5.61
2502	NASDAQ	CERS	Wed, Jan 17, 2007	6.32	6.39	5.73	5.74
2501	NASDAQ	CERS	Tue, Jan 16, 2007	5.49	6.16	5.38	6.14
2500	NASDAQ	CERS	Fri, Jan 12, 2007	5.40	5.53	5.36	5.44
2499	NASDAQ	CERS	Thu, Jan 11, 2007	5.33	5.54	5.30	5.41
2498	NASDAQ	CERS	Wed, Jan 10, 2007	5.45	5.51	5.31	5.34
2497	NASDAQ	CERS	Tue, Jan 9, 2007	5.21	5.54	5.20	5.52
2496	NASDAQ	CERS	Mon, Jan 8, 2007	5.39	5.41	5.11	5.19
2495	NASDAQ	CERS	Fri, Jan 5, 2007	5.52	5.60	5.39	5.39
2494	NASDAQ	CERS	Thu, Jan 4, 2007	5.65	5.65	5.52	5.54
2493	NASDAQ	CERS	Wed, Jan 3, 2007	5.93	5.96	5.55	5.68
2492	NASDAQ	CERS	Fri, Dec 29, 2006	6.04	6.14	5.84	5.86
2491	NASDAQ	CERS	Thu, Dec 28, 2006	6.25	6.31	6.05	6.05
2490	NASDAQ	CERS	Wed, Dec 27, 2006	6.19	6.46	6.11	6.27
2489	NASDAQ	CERS	Tue, Dec 26, 2006	5.94	6.15	5.94	6.12
2488	NASDAQ	CERS	Fri, Dec 22, 2006	5.99	6.05	5.89	5.91
2487	NASDAQ	CERS	Thu, Dec 21, 2006	5.97	6.05	5.88	6.00
2486	NASDAQ	CERS	Wed, Dec 20, 2006	5.96	6.02	5.87	5.94
2485	NASDAQ	CERS	Tue, Dec 19, 2006	5.79	5.95	5.71	5.92
2484	NASDAQ	CERS	Mon, Dec 18, 2006	6.10	6.10	5.76	5.83
2483	NASDAQ	CERS	Fri, Dec 15, 2006	6.19	6.29	6.05	6.06
2482	NASDAQ	CERS	Thu, Dec 14, 2006	6.04	6.29	6.04	6.16
2481	NASDAQ	CERS	Wed, Dec 13, 2006	6.31	6.35	5.96	6.06
2480	NASDAQ	CERS	Tue, Dec 12, 2006	6.43	6.52	6.19	6.24
2479	NASDAQ	CERS	Mon, Dec 11, 2006	6.54	6.70	6.41	6.47
2478	NASDAQ	CERS	Fri, Dec 8, 2006	6.66	6.75	6.50	6.58
2477	NASDAQ	CERS	Thu, Dec 7, 2006	6.85	6.86	6.64	6.66
2476	NASDAQ	CERS	Wed, Dec 6, 2006	7.40	7.44	6.35	6.80
2475	NASDAQ	CERS	Tue, Dec 5, 2006	7.53	7.75	7.37	7.42
2474	NASDAQ	CERS	Mon, Dec 4, 2006	7.51	7.73	7.34	7.47
2473	NASDAQ	CERS	Fri, Dec 1, 2006	7.78	7.90	7.33	7.47
2472	NASDAQ	CERS	Thu, Nov 30, 2006	7.66	7.93	7.60	7.78
2471	NASDAQ	CERS	Wed, Nov 29, 2006	7.90	8.18	7.60	7.68
2470	NASDAQ	CERS	Tue, Nov 28, 2006	7.48	7.90	7.30	7.86
2469	NASDAQ	CERS	Mon, Nov 27, 2006	8.15	8.18	7.39	7.48
2468	NASDAQ	CERS	Fri, Nov 24, 2006	8.14	8.46	8.13	8.19
2467	NASDAQ	CERS	Wed, Nov 22, 2006	8.40	8.49	8.19	8.22
2466	NASDAQ	CERS	Tue, Nov 21, 2006	8.61	8.70	8.23	8.36
2465	NASDAQ	CERS	Mon, Nov 20, 2006	7.72	8.89	7.72	8.59
2464	NASDAQ	CERS	Fri, Nov 17, 2006	7.95	8.38	7.87	8.23
2463	NASDAQ	CERS	Thu, Nov 16, 2006	7.97	8.04	7.82	7.92
2462	NASDAQ	CERS	Wed, Nov 15, 2006	7.96	8.26	7.85	7.90
2461	NASDAQ	CERS	Tue, Nov 14, 2006	7.91	8.02	7.80	7.99
2460	NASDAQ	CERS	Mon, Nov 13, 2006	7.96	8.09	7.71	7.91
2459	NASDAQ	CERS	Fri, Nov 10, 2006	7.70	8.01	7.65	7.96
2458	NASDAQ	CERS	Thu, Nov 9, 2006	7.80	7.96	7.60	7.70
2457	NASDAQ	CERS	Wed, Nov 8, 2006	7.66	7.97	7.42	7.75
2456	NASDAQ	CERS	Tue, Nov 7, 2006	7.52	7.96	7.49	7.59
2455	NASDAQ	CERS	Mon, Nov 6, 2006	7.30	7.62	7.21	7.50
2454	NASDAQ	CERS	Fri, Nov 3, 2006	7.22	7.55	7.19	7.28
2453	NASDAQ	CERS	Thu, Nov 2, 2006	7.06	7.57	7.02	7.20
2452	NASDAQ	CERS	Wed, Nov 1, 2006	7.05	7.38	7.02	7.11
2451	NASDAQ	CERS	Tue, Oct 31, 2006	6.81	7.59	6.76	7.20
2450	NASDAQ	CERS	Mon, Oct 30, 2006	6.83	6.97	6.57	6.78
2449	NASDAQ	CERS	Fri, Oct 27, 2006	6.84	7.10	6.77	6.83
2448	NASDAQ	CERS	Thu, Oct 26, 2006	6.66	6.96	6.66	6.92
2447	NASDAQ	CERS	Wed, Oct 25, 2006	6.96	7.02	6.56	6.61
2446	NASDAQ	CERS	Tue, Oct 24, 2006	7.19	7.20	6.89	6.94
2445	NASDAQ	CERS	Mon, Oct 23, 2006	7.03	7.39	7.01	7.20
2444	NASDAQ	CERS	Fri, Oct 20, 2006	7.26	7.33	7.01	7.07
2443	NASDAQ	CERS	Thu, Oct 19, 2006	6.95	7.27	6.79	7.21
2442	NASDAQ	CERS	Wed, Oct 18, 2006	7.04	7.13	6.85	6.94
2441	NASDAQ	CERS	Tue, Oct 17, 2006	6.95	7.18	6.74	7.02
2440	NASDAQ	CERS	Mon, Oct 16, 2006	6.86	7.05	6.79	6.98
2439	NASDAQ	CERS	Fri, Oct 13, 2006	6.61	7.00	6.60	6.92
2438	NASDAQ	CERS	Thu, Oct 12, 2006	6.18	6.62	6.12	6.58
2437	NASDAQ	CERS	Wed, Oct 11, 2006	6.22	6.35	6.04	6.17
2436	NASDAQ	CERS	Tue, Oct 10, 2006	6.23	6.29	6.01	6.23
2435	NASDAQ	CERS	Mon, Oct 9, 2006	6.18	6.28	5.99	6.20
2434	NASDAQ	CERS	Fri, Oct 6, 2006	6.25	6.53	6.11	6.21
2433	NASDAQ	CERS	Thu, Oct 5, 2006	5.75	6.40	5.67	6.27
2432	NASDAQ	CERS	Wed, Oct 4, 2006	5.48	5.81	5.47	5.78
2431	NASDAQ	CERS	Tue, Oct 3, 2006	5.60	5.68	5.42	5.47
2430	NASDAQ	CERS	Mon, Oct 2, 2006	5.52	5.68	5.52	5.60
2429	NASDAQ	CERS	Fri, Sep 29, 2006	5.84	5.91	5.53	5.55
2428	NASDAQ	CERS	Thu, Sep 28, 2006	5.71	5.91	5.70	5.80
2427	NASDAQ	CERS	Wed, Sep 27, 2006	5.59	5.83	5.59	5.72
2426	NASDAQ	CERS	Tue, Sep 26, 2006	5.61	5.74	5.59	5.62
2425	NASDAQ	CERS	Mon, Sep 25, 2006	5.50	5.79	5.50	5.59
2424	NASDAQ	CERS	Fri, Sep 22, 2006	5.67	5.71	5.52	5.57
2423	NASDAQ	CERS	Thu, Sep 21, 2006	5.92	6.01	5.64	5.71
2422	NASDAQ	CERS	Wed, Sep 20, 2006	5.79	6.05	5.73	5.87
2421	NASDAQ	CERS	Tue, Sep 19, 2006	5.81	5.88	5.60	5.73
2420	NASDAQ	CERS	Mon, Sep 18, 2006	5.84	5.93	5.75	5.83
2419	NASDAQ	CERS	Fri, Sep 15, 2006	6.05	6.15	5.79	5.88
2418	NASDAQ	CERS	Thu, Sep 14, 2006	5.95	6.08	5.89	5.98
2417	NASDAQ	CERS	Wed, Sep 13, 2006	5.73	6.00	5.70	6.00
2416	NASDAQ	CERS	Tue, Sep 12, 2006	5.57	5.83	5.57	5.73
2415	NASDAQ	CERS	Mon, Sep 11, 2006	5.72	5.74	5.57	5.60
2414	NASDAQ	CERS	Fri, Sep 8, 2006	5.94	5.94	5.71	5.73
2413	NASDAQ	CERS	Thu, Sep 7, 2006	6.09	6.11	5.93	5.95
2412	NASDAQ	CERS	Wed, Sep 6, 2006	6.20	6.25	6.10	6.12
2411	NASDAQ	CERS	Tue, Sep 5, 2006	6.26	6.29	6.17	6.26
2410	NASDAQ	CERS	Fri, Sep 1, 2006	6.50	6.75	6.22	6.26
2409	NASDAQ	CERS	Thu, Aug 31, 2006	6.50	6.81	6.45	6.48
2408	NASDAQ	CERS	Wed, Aug 30, 2006	6.22	6.45	6.20	6.28
2407	NASDAQ	CERS	Tue, Aug 29, 2006	5.99	6.23	5.97	6.19
2406	NASDAQ	CERS	Mon, Aug 28, 2006	5.68	6.07	5.64	5.94
2405	NASDAQ	CERS	Fri, Aug 25, 2006	5.63	5.86	5.57	5.65
2404	NASDAQ	CERS	Thu, Aug 24, 2006	5.31	5.80	5.31	5.62
2403	NASDAQ	CERS	Wed, Aug 23, 2006	5.40	5.50	5.27	5.31
2402	NASDAQ	CERS	Tue, Aug 22, 2006	5.40	5.53	5.38	5.40
2401	NASDAQ	CERS	Mon, Aug 21, 2006	5.61	5.63	5.40	5.41
2400	NASDAQ	CERS	Fri, Aug 18, 2006	5.54	5.65	5.41	5.63
2399	NASDAQ	CERS	Thu, Aug 17, 2006	5.54	5.57	5.46	5.50
2398	NASDAQ	CERS	Wed, Aug 16, 2006	5.63	5.76	5.43	5.53
2397	NASDAQ	CERS	Tue, Aug 15, 2006	5.52	5.63	5.46	5.57
2396	NASDAQ	CERS	Mon, Aug 14, 2006	5.59	5.77	5.41	5.41
2395	NASDAQ	CERS	Fri, Aug 11, 2006	5.86	5.95	5.45	5.52
2394	NASDAQ	CERS	Thu, Aug 10, 2006	5.82	6.11	5.78	5.90
2393	NASDAQ	CERS	Wed, Aug 9, 2006	5.85	6.20	5.85	5.91
2392	NASDAQ	CERS	Tue, Aug 8, 2006	6.12	6.16	5.79	5.79
2391	NASDAQ	CERS	Mon, Aug 7, 2006	5.79	6.20	5.79	6.05
2390	NASDAQ	CERS	Fri, Aug 4, 2006	6.12	6.20	5.75	5.85
2389	NASDAQ	CERS	Thu, Aug 3, 2006	5.85	6.04	5.70	5.92
2388	NASDAQ	CERS	Wed, Aug 2, 2006	5.89	6.04	5.75	5.84
2387	NASDAQ	CERS	Tue, Aug 1, 2006	5.94	6.10	5.79	5.90
2386	NASDAQ	CERS	Mon, Jul 31, 2006	6.06	6.19	5.76	6.01
2385	NASDAQ	CERS	Fri, Jul 28, 2006	5.89	6.27	5.75	6.04
2384	NASDAQ	CERS	Thu, Jul 27, 2006	6.12	6.19	5.76	5.85
2383	NASDAQ	CERS	Wed, Jul 26, 2006	6.16	6.32	6.04	6.05
2382	NASDAQ	CERS	Tue, Jul 25, 2006	5.92	6.36	5.92	6.23
2381	NASDAQ	CERS	Mon, Jul 24, 2006	5.93	6.35	5.93	6.03
2380	NASDAQ	CERS	Fri, Jul 21, 2006	6.03	6.03	5.69	5.86
2379	NASDAQ	CERS	Thu, Jul 20, 2006	6.40	6.50	5.99	6.02
2378	NASDAQ	CERS	Wed, Jul 19, 2006	5.92	6.50	5.78	6.41
2377	NASDAQ	CERS	Tue, Jul 18, 2006	6.08	6.12	5.53	5.94
2376	NASDAQ	CERS	Mon, Jul 17, 2006	6.50	6.53	5.97	5.99
2375	NASDAQ	CERS	Fri, Jul 14, 2006	6.42	6.57	6.25	6.52
2374	NASDAQ	CERS	Thu, Jul 13, 2006	6.79	6.83	6.42	6.42
2373	NASDAQ	CERS	Wed, Jul 12, 2006	7.12	7.27	6.80	6.81
2372	NASDAQ	CERS	Tue, Jul 11, 2006	7.05	7.21	6.90	7.15
2371	NASDAQ	CERS	Mon, Jul 10, 2006	7.08	7.30	7.07	7.12
2370	NASDAQ	CERS	Fri, Jul 7, 2006	7.20	7.32	7.08	7.08
2369	NASDAQ	CERS	Thu, Jul 6, 2006	7.52	7.88	7.17	7.24
2368	NASDAQ	CERS	Wed, Jul 5, 2006	7.22	7.52	7.06	7.51
2367	NASDAQ	CERS	Mon, Jul 3, 2006	7.17	7.40	7.00	7.36
2366	NASDAQ	CERS	Fri, Jun 30, 2006	7.18	7.45	7.10	7.13
2365	NASDAQ	CERS	Thu, Jun 29, 2006	7.31	7.31	7.02	7.16
2364	NASDAQ	CERS	Wed, Jun 28, 2006	7.41	7.41	7.03	7.22
2363	NASDAQ	CERS	Tue, Jun 27, 2006	7.59	7.71	7.24	7.37
2362	NASDAQ	CERS	Mon, Jun 26, 2006	7.52	7.87	7.45	7.61
2361	NASDAQ	CERS	Fri, Jun 23, 2006	7.36	7.74	7.33	7.62
2360	NASDAQ	CERS	Thu, Jun 22, 2006	7.31	7.44	7.11	7.36
2359	NASDAQ	CERS	Wed, Jun 21, 2006	7.11	7.46	7.07	7.38
2358	NASDAQ	CERS	Tue, Jun 20, 2006	7.20	7.43	7.08	7.15
2357	NASDAQ	CERS	Mon, Jun 19, 2006	7.49	8.47	7.18	7.24
2356	NASDAQ	CERS	Fri, Jun 16, 2006	7.75	7.76	7.40	7.44
2355	NASDAQ	CERS	Thu, Jun 15, 2006	7.58	7.79	7.42	7.77
2354	NASDAQ	CERS	Wed, Jun 14, 2006	7.67	7.67	7.31	7.50
2353	NASDAQ	CERS	Tue, Jun 13, 2006	7.61	7.95	7.57	7.65
2352	NASDAQ	CERS	Mon, Jun 12, 2006	8.09	8.10	7.61	7.66
2351	NASDAQ	CERS	Fri, Jun 9, 2006	8.20	8.23	8.00	8.11
2350	NASDAQ	CERS	Thu, Jun 8, 2006	8.25	8.30	7.60	8.13
2349	NASDAQ	CERS	Wed, Jun 7, 2006	8.06	8.50	8.04	8.31
2348	NASDAQ	CERS	Tue, Jun 6, 2006	8.44	8.44	7.85	8.06
2347	NASDAQ	CERS	Mon, Jun 5, 2006	8.58	8.70	8.19	8.38
2346	NASDAQ	CERS	Fri, Jun 2, 2006	8.50	8.73	8.42	8.60
2345	NASDAQ	CERS	Thu, Jun 1, 2006	8.31	8.53	8.11	8.47
2344	NASDAQ	CERS	Wed, May 31, 2006	8.11	8.25	7.80	8.25
2343	NASDAQ	CERS	Tue, May 30, 2006	8.11	8.36	8.00	8.10
2342	NASDAQ	CERS	Fri, May 26, 2006	7.66	8.25	7.45	8.13
2341	NASDAQ	CERS	Thu, May 25, 2006	7.85	7.90	7.26	7.64
2340	NASDAQ	CERS	Wed, May 24, 2006	6.85	7.79	6.65	7.68
2339	NASDAQ	CERS	Tue, May 23, 2006	7.30	7.39	6.83	6.85
2338	NASDAQ	CERS	Mon, May 22, 2006	7.25	7.27	7.00	7.25
2337	NASDAQ	CERS	Fri, May 19, 2006	6.85	7.35	6.76	7.23
2336	NASDAQ	CERS	Thu, May 18, 2006	6.36	6.67	6.36	6.50
2335	NASDAQ	CERS	Wed, May 17, 2006	6.50	6.59	6.29	6.37
2334	NASDAQ	CERS	Tue, May 16, 2006	6.79	6.98	6.50	6.51
2333	NASDAQ	CERS	Mon, May 15, 2006	6.54	6.87	6.50	6.75
2332	NASDAQ	CERS	Fri, May 12, 2006	6.90	6.90	6.40	6.61
2331	NASDAQ	CERS	Thu, May 11, 2006	7.17	7.29	6.86	6.94
2330	NASDAQ	CERS	Wed, May 10, 2006	6.81	7.33	6.75	7.20
2329	NASDAQ	CERS	Tue, May 9, 2006	7.01	7.03	6.80	6.85
2328	NASDAQ	CERS	Mon, May 8, 2006	7.15	7.20	7.00	7.02
2327	NASDAQ	CERS	Fri, May 5, 2006	7.38	7.50	7.09	7.17
2326	NASDAQ	CERS	Thu, May 4, 2006	6.85	7.46	6.85	7.36
2325	NASDAQ	CERS	Wed, May 3, 2006	6.95	7.09	6.81	6.98
2324	NASDAQ	CERS	Tue, May 2, 2006	6.98	7.12	6.86	6.93
2323	NASDAQ	CERS	Mon, May 1, 2006	6.85	7.11	6.85	7.00
2322	NASDAQ	CERS	Fri, Apr 28, 2006	6.85	7.01	6.80	6.90
2321	NASDAQ	CERS	Thu, Apr 27, 2006	6.97	7.07	6.85	6.90
2320	NASDAQ	CERS	Wed, Apr 26, 2006	7.09	7.18	6.96	7.03
2319	NASDAQ	CERS	Tue, Apr 25, 2006	7.16	7.25	7.08	7.08
2318	NASDAQ	CERS	Mon, Apr 24, 2006	7.11	7.25	7.08	7.18
2317	NASDAQ	CERS	Fri, Apr 21, 2006	7.10	7.25	7.10	7.20
2316	NASDAQ	CERS	Thu, Apr 20, 2006	7.13	7.25	7.09	7.10
2315	NASDAQ	CERS	Wed, Apr 19, 2006	7.15	7.28	7.00	7.20
2314	NASDAQ	CERS	Tue, Apr 18, 2006	7.00	7.28	6.83	7.18
2313	NASDAQ	CERS	Mon, Apr 17, 2006	7.10	7.22	6.97	6.99
2312	NASDAQ	CERS	Thu, Apr 13, 2006	7.43	7.68	7.35	7.55
2311	NASDAQ	CERS	Wed, Apr 12, 2006	7.06	7.49	7.06	7.40
2310	NASDAQ	CERS	Tue, Apr 11, 2006	7.46	7.63	7.01	7.18
2309	NASDAQ	CERS	Mon, Apr 10, 2006	7.86	7.91	7.36	7.49
2308	NASDAQ	CERS	Fri, Apr 7, 2006	8.02	8.15	7.86	7.90
2307	NASDAQ	CERS	Thu, Apr 6, 2006	7.84	8.04	7.77	7.97
2306	NASDAQ	CERS	Wed, Apr 5, 2006	7.96	8.00	7.65	7.84
2305	NASDAQ	CERS	Tue, Apr 4, 2006	8.00	8.20	7.95	7.96
2304	NASDAQ	CERS	Mon, Apr 3, 2006	8.52	8.58	7.89	8.00
2303	NASDAQ	CERS	Fri, Mar 31, 2006	8.49	8.73	8.49	8.56
2302	NASDAQ	CERS	Thu, Mar 30, 2006	8.75	8.76	8.46	8.51
2301	NASDAQ	CERS	Wed, Mar 29, 2006	8.52	8.81	8.52	8.75
2300	NASDAQ	CERS	Tue, Mar 28, 2006	8.51	8.78	8.49	8.54
2299	NASDAQ	CERS	Mon, Mar 27, 2006	8.84	8.84	8.19	8.43
2298	NASDAQ	CERS	Fri, Mar 24, 2006	8.40	8.90	8.28	8.81
2297	NASDAQ	CERS	Thu, Mar 23, 2006	8.65	8.75	8.10	8.27
2296	NASDAQ	CERS	Wed, Mar 22, 2006	8.81	8.92	8.65	8.66
2295	NASDAQ	CERS	Tue, Mar 21, 2006	8.95	9.08	8.72	8.79
2294	NASDAQ	CERS	Mon, Mar 20, 2006	8.97	9.00	8.70	8.70
2293	NASDAQ	CERS	Fri, Mar 17, 2006	8.75	9.21	8.75	9.00
2292	NASDAQ	CERS	Thu, Mar 16, 2006	9.07	9.20	8.60	8.75
2291	NASDAQ	CERS	Wed, Mar 15, 2006	8.90	9.23	8.82	9.21
2290	NASDAQ	CERS	Tue, Mar 14, 2006	9.22	9.23	8.37	8.90
2289	NASDAQ	CERS	Mon, Mar 13, 2006	9.03	9.50	8.72	9.20
2288	NASDAQ	CERS	Fri, Mar 10, 2006	9.57	9.59	9.00	9.07
2287	NASDAQ	CERS	Thu, Mar 9, 2006	9.90	9.90	9.48	9.54
2286	NASDAQ	CERS	Wed, Mar 8, 2006	9.61	10.26	9.61	9.82
2285	NASDAQ	CERS	Tue, Mar 7, 2006	10.36	10.53	9.48	9.61
2284	NASDAQ	CERS	Mon, Mar 6, 2006	10.61	10.84	10.36	10.41
2283	NASDAQ	CERS	Fri, Mar 3, 2006	10.73	11.00	10.58	10.63
2282	NASDAQ	CERS	Thu, Mar 2, 2006	10.90	11.00	10.61	10.75
2281	NASDAQ	CERS	Wed, Mar 1, 2006	10.91	11.14	10.81	10.99
2280	NASDAQ	CERS	Tue, Feb 28, 2006	11.57	11.63	10.78	10.83
2279	NASDAQ	CERS	Mon, Feb 27, 2006	11.62	11.90	11.56	11.62
2278	NASDAQ	CERS	Fri, Feb 24, 2006	11.98	12.20	11.00	11.56
2277	NASDAQ	CERS	Thu, Feb 23, 2006	12.43	12.84	11.68	11.87
2276	NASDAQ	CERS	Wed, Feb 22, 2006	12.97	12.98	12.24	12.50
2275	NASDAQ	CERS	Tue, Feb 21, 2006	13.09	13.49	12.94	13.01
2274	NASDAQ	CERS	Fri, Feb 17, 2006	13.24	13.34	12.93	12.98
2273	NASDAQ	CERS	Thu, Feb 16, 2006	13.02	13.24	12.73	13.00
2272	NASDAQ	CERS	Wed, Feb 15, 2006	12.58	13.03	11.95	12.99
2271	NASDAQ	CERS	Tue, Feb 14, 2006	12.79	12.90	12.50	12.58
2270	NASDAQ	CERS	Mon, Feb 13, 2006	12.34	13.10	12.02	12.70
2269	NASDAQ	CERS	Fri, Feb 10, 2006	13.56	13.75	11.74	12.30
2268	NASDAQ	CERS	Thu, Feb 9, 2006	14.00	14.00	13.60	13.65
2267	NASDAQ	CERS	Wed, Feb 8, 2006	14.09	14.34	13.85	13.97
2266	NASDAQ	CERS	Tue, Feb 7, 2006	14.19	14.29	13.85	14.00
2265	NASDAQ	CERS	Mon, Feb 6, 2006	14.36	14.37	14.05	14.14
2264	NASDAQ	CERS	Fri, Feb 3, 2006	14.00	14.54	13.70	14.05
2263	NASDAQ	CERS	Thu, Feb 2, 2006	14.20	14.20	13.62	13.93
2262	NASDAQ	CERS	Wed, Feb 1, 2006	14.48	14.76	13.88	14.20
2261	NASDAQ	CERS	Tue, Jan 31, 2006	14.53	14.69	13.56	14.30
2260	NASDAQ	CERS	Mon, Jan 30, 2006	14.39	14.71	14.20	14.48
2259	NASDAQ	CERS	Fri, Jan 27, 2006	14.48	14.66	14.04	14.29
2258	NASDAQ	CERS	Thu, Jan 26, 2006	14.14	14.75	14.01	14.34
2257	NASDAQ	CERS	Wed, Jan 25, 2006	14.01	14.10	13.80	13.97
2256	NASDAQ	CERS	Tue, Jan 24, 2006	14.13	14.25	13.60	14.08
2255	NASDAQ	CERS	Mon, Jan 23, 2006	13.97	14.22	13.63	13.82
2254	NASDAQ	CERS	Fri, Jan 20, 2006	13.32	14.00	13.32	13.61
2253	NASDAQ	CERS	Thu, Jan 19, 2006	13.89	13.89	13.25	13.32
2252	NASDAQ	CERS	Wed, Jan 18, 2006	13.40	13.86	13.00	13.60
2251	NASDAQ	CERS	Tue, Jan 17, 2006	12.25	13.72	12.21	13.52
2250	NASDAQ	CERS	Fri, Jan 13, 2006	12.11	12.11	11.95	12.05
2249	NASDAQ	CERS	Thu, Jan 12, 2006	12.15	12.15	11.88	12.04
2248	NASDAQ	CERS	Wed, Jan 11, 2006	12.10	12.24	11.98	12.03
2247	NASDAQ	CERS	Tue, Jan 10, 2006	11.79	12.15	11.50	12.02
2246	NASDAQ	CERS	Mon, Jan 9, 2006	11.76	12.25	11.37	11.76
2245	NASDAQ	CERS	Fri, Jan 6, 2006	10.16	10.46	10.16	10.32
2244	NASDAQ	CERS	Thu, Jan 5, 2006	10.34	10.50	10.18	10.24
2243	NASDAQ	CERS	Wed, Jan 4, 2006	9.70	10.50	9.70	10.25
2242	NASDAQ	CERS	Tue, Jan 3, 2006	10.16	10.31	10.00	10.01
2241	NASDAQ	CERS	Fri, Dec 30, 2005	10.18	10.37	9.74	10.15
2240	NASDAQ	CERS	Thu, Dec 29, 2005	9.65	10.29	9.62	10.17
2239	NASDAQ	CERS	Wed, Dec 28, 2005	10.98	10.98	9.64	9.72
2238	NASDAQ	CERS	Tue, Dec 27, 2005	10.80	11.00	10.39	10.62
2237	NASDAQ	CERS	Fri, Dec 23, 2005	10.60	10.78	10.45	10.62
2236	NASDAQ	CERS	Thu, Dec 22, 2005	10.48	10.89	10.48	10.62
2235	NASDAQ	CERS	Wed, Dec 21, 2005	10.25	10.67	10.19	10.41
2234	NASDAQ	CERS	Tue, Dec 20, 2005	10.65	10.81	10.05	10.30
2233	NASDAQ	CERS	Mon, Dec 19, 2005	11.43	11.46	10.72	10.73
2232	NASDAQ	CERS	Fri, Dec 16, 2005	11.11	11.63	10.78	11.33
2231	NASDAQ	CERS	Thu, Dec 15, 2005	10.57	11.08	10.24	11.01
2230	NASDAQ	CERS	Wed, Dec 14, 2005	10.36	10.50	10.10	10.49
2229	NASDAQ	CERS	Tue, Dec 13, 2005	10.60	10.65	10.05	10.33
2228	NASDAQ	CERS	Mon, Dec 12, 2005	10.25	10.59	10.15	10.56
2227	NASDAQ	CERS	Fri, Dec 9, 2005	9.53	10.17	9.46	10.06
2226	NASDAQ	CERS	Thu, Dec 8, 2005	9.89	9.89	9.46	9.63
2225	NASDAQ	CERS	Wed, Dec 7, 2005	9.99	10.25	9.56	9.75
2224	NASDAQ	CERS	Tue, Dec 6, 2005	8.70	9.85	8.62	9.74
2223	NASDAQ	CERS	Mon, Dec 5, 2005	8.95	8.95	8.71	8.74
2222	NASDAQ	CERS	Fri, Dec 2, 2005	8.86	8.92	8.52	8.74
2221	NASDAQ	CERS	Thu, Dec 1, 2005	8.95	9.08	8.50	8.92
2220	NASDAQ	CERS	Wed, Nov 30, 2005	8.63	9.03	8.60	8.94
2219	NASDAQ	CERS	Tue, Nov 29, 2005	8.84	9.20	8.50	8.72
2218	NASDAQ	CERS	Mon, Nov 28, 2005	8.82	9.00	8.59	8.84
2217	NASDAQ	CERS	Fri, Nov 25, 2005	8.36	8.75	8.35	8.69
2216	NASDAQ	CERS	Wed, Nov 23, 2005	8.16	8.73	7.95	8.40
2215	NASDAQ	CERS	Tue, Nov 22, 2005	8.17	8.18	7.71	8.13
2214	NASDAQ	CERS	Mon, Nov 21, 2005	7.64	8.17	7.50	8.12
2213	NASDAQ	CERS	Fri, Nov 18, 2005	7.30	7.30	7.12	7.27
2212	NASDAQ	CERS	Thu, Nov 17, 2005	7.47	7.63	6.93	7.17
2211	NASDAQ	CERS	Wed, Nov 16, 2005	7.50	7.71	7.35	7.42
2210	NASDAQ	CERS	Tue, Nov 15, 2005	7.68	7.90	7.39	7.48
2209	NASDAQ	CERS	Mon, Nov 14, 2005	7.30	7.54	7.20	7.46
2208	NASDAQ	CERS	Fri, Nov 11, 2005	7.09	7.67	7.01	7.24
2207	NASDAQ	CERS	Thu, Nov 10, 2005	7.08	7.13	6.90	6.98
2206	NASDAQ	CERS	Wed, Nov 9, 2005	7.02	7.07	6.87	6.93
2205	NASDAQ	CERS	Tue, Nov 8, 2005	6.88	7.00	6.80	6.96
2204	NASDAQ	CERS	Mon, Nov 7, 2005	6.70	6.83	6.63	6.81
2203	NASDAQ	CERS	Fri, Nov 4, 2005	6.89	6.89	6.61	6.70
2202	NASDAQ	CERS	Thu, Nov 3, 2005	6.81	6.95	6.55	6.85
2201	NASDAQ	CERS	Wed, Nov 2, 2005	6.94	7.08	6.46	6.67
2200	NASDAQ	CERS	Tue, Nov 1, 2005	6.77	6.93	6.61	6.80
2199	NASDAQ	CERS	Mon, Oct 31, 2005	6.61	6.95	6.53	6.63
2198	NASDAQ	CERS	Fri, Oct 28, 2005	6.62	6.89	6.62	6.66
2197	NASDAQ	CERS	Thu, Oct 27, 2005	7.00	7.21	6.68	6.71
2196	NASDAQ	CERS	Wed, Oct 26, 2005	7.55	7.57	7.04	7.16
2195	NASDAQ	CERS	Tue, Oct 25, 2005	7.50	7.73	7.40	7.45
2194	NASDAQ	CERS	Mon, Oct 24, 2005	7.20	7.71	6.90	7.37
2193	NASDAQ	CERS	Fri, Oct 21, 2005	6.94	7.17	6.88	7.10
2192	NASDAQ	CERS	Thu, Oct 20, 2005	6.93	6.99	6.82	6.86
2191	NASDAQ	CERS	Wed, Oct 19, 2005	6.73	6.86	6.50	6.83
2190	NASDAQ	CERS	Tue, Oct 18, 2005	7.07	7.07	6.66	6.73
2189	NASDAQ	CERS	Mon, Oct 17, 2005	6.75	7.06	6.62	6.98
2188	NASDAQ	CERS	Fri, Oct 14, 2005	7.87	7.87	6.51	6.80
2187	NASDAQ	CERS	Thu, Oct 13, 2005	7.72	7.90	7.57	7.59
2186	NASDAQ	CERS	Wed, Oct 12, 2005	7.70	7.95	7.67	7.78
2185	NASDAQ	CERS	Tue, Oct 11, 2005	8.75	8.90	7.71	7.89
2184	NASDAQ	CERS	Mon, Oct 10, 2005	8.77	8.85	8.68	8.75
2183	NASDAQ	CERS	Fri, Oct 7, 2005	8.80	9.00	8.70	8.79
2182	NASDAQ	CERS	Thu, Oct 6, 2005	8.80	8.97	8.73	8.95
2181	NASDAQ	CERS	Wed, Oct 5, 2005	9.06	9.06	8.72	8.80
2180	NASDAQ	CERS	Tue, Oct 4, 2005	9.10	9.20	8.82	8.99
2179	NASDAQ	CERS	Mon, Oct 3, 2005	8.78	9.15	8.75	8.90
2178	NASDAQ	CERS	Fri, Sep 30, 2005	9.05	9.06	8.77	8.86
2177	NASDAQ	CERS	Thu, Sep 29, 2005	9.00	9.10	8.67	9.01
2176	NASDAQ	CERS	Wed, Sep 28, 2005	8.94	9.23	8.74	9.03
2175	NASDAQ	CERS	Tue, Sep 27, 2005	8.57	9.00	8.51	8.82
2174	NASDAQ	CERS	Mon, Sep 26, 2005	9.04	9.16	8.50	8.59
2173	NASDAQ	CERS	Fri, Sep 23, 2005	8.23	8.87	8.21	8.80
2172	NASDAQ	CERS	Thu, Sep 22, 2005	8.48	8.77	8.17	8.29
2171	NASDAQ	CERS	Wed, Sep 21, 2005	8.60	8.80	8.25	8.54
2170	NASDAQ	CERS	Tue, Sep 20, 2005	8.70	9.05	8.38	8.60
2169	NASDAQ	CERS	Mon, Sep 19, 2005	8.45	9.00	8.42	8.72
2168	NASDAQ	CERS	Fri, Sep 16, 2005	7.88	8.45	7.88	8.31
2167	NASDAQ	CERS	Thu, Sep 15, 2005	7.80	7.93	7.56	7.90
2166	NASDAQ	CERS	Wed, Sep 14, 2005	7.92	7.92	7.71	7.80
2165	NASDAQ	CERS	Tue, Sep 13, 2005	7.84	7.99	7.38	7.77
2164	NASDAQ	CERS	Mon, Sep 12, 2005	7.63	8.05	7.63	7.92
2163	NASDAQ	CERS	Fri, Sep 9, 2005	7.75	8.05	7.47	7.63
2162	NASDAQ	CERS	Thu, Sep 8, 2005	7.60	8.15	7.60	7.74
2161	NASDAQ	CERS	Wed, Sep 7, 2005	7.05	7.78	6.80	7.55
2160	NASDAQ	CERS	Tue, Sep 6, 2005	7.12	7.15	6.84	7.02
2159	NASDAQ	CERS	Fri, Sep 2, 2005	7.09	7.15	6.84	6.99
2158	NASDAQ	CERS	Thu, Sep 1, 2005	7.07	7.15	6.84	6.93
2157	NASDAQ	CERS	Wed, Aug 31, 2005	6.35	7.07	6.35	6.76
2156	NASDAQ	CERS	Tue, Aug 30, 2005	6.15	6.50	6.12	6.22
2155	NASDAQ	CERS	Mon, Aug 29, 2005	6.12	6.34	5.78	6.19
2154	NASDAQ	CERS	Fri, Aug 26, 2005	6.34	6.49	6.17	6.22
2153	NASDAQ	CERS	Thu, Aug 25, 2005	5.97	6.33	5.96	6.32
2152	NASDAQ	CERS	Wed, Aug 24, 2005	6.32	6.46	5.85	5.97
2151	NASDAQ	CERS	Tue, Aug 23, 2005	6.62	6.67	6.28	6.42
2150	NASDAQ	CERS	Mon, Aug 22, 2005	7.01	7.23	6.14	6.75
2149	NASDAQ	CERS	Fri, Aug 19, 2005	7.35	7.42	7.05	7.39
2148	NASDAQ	CERS	Thu, Aug 18, 2005	7.02	7.29	7.02	7.23
2147	NASDAQ	CERS	Wed, Aug 17, 2005	7.05	7.25	7.00	7.07
2146	NASDAQ	CERS	Tue, Aug 16, 2005	7.29	7.30	6.99	7.09
2145	NASDAQ	CERS	Mon, Aug 15, 2005	7.09	7.29	7.00	7.23
2144	NASDAQ	CERS	Fri, Aug 12, 2005	7.07	7.07	6.87	6.99
2143	NASDAQ	CERS	Thu, Aug 11, 2005	7.18	7.22	6.88	7.09
2142	NASDAQ	CERS	Wed, Aug 10, 2005	7.31	7.31	6.88	7.14
2141	NASDAQ	CERS	Tue, Aug 9, 2005	7.69	7.70	7.11	7.24
2140	NASDAQ	CERS	Mon, Aug 8, 2005	7.15	7.71	7.03	7.51
2139	NASDAQ	CERS	Fri, Aug 5, 2005	7.00	7.07	6.73	6.96
2138	NASDAQ	CERS	Thu, Aug 4, 2005	6.89	7.10	6.74	7.00
2137	NASDAQ	CERS	Wed, Aug 3, 2005	7.15	7.24	6.04	6.91
2136	NASDAQ	CERS	Tue, Aug 2, 2005	7.00	7.26	7.00	7.10
2135	NASDAQ	CERS	Mon, Aug 1, 2005	6.82	7.09	6.75	6.99
2134	NASDAQ	CERS	Fri, Jul 29, 2005	6.79	7.10	6.69	6.82
2133	NASDAQ	CERS	Thu, Jul 28, 2005	6.57	6.81	6.38	6.76
2132	NASDAQ	CERS	Wed, Jul 27, 2005	5.90	7.17	5.65	6.67
2131	NASDAQ	CERS	Tue, Jul 26, 2005	5.58	5.92	5.58	5.79
2130	NASDAQ	CERS	Mon, Jul 25, 2005	5.10	5.80	5.05	5.53
2129	NASDAQ	CERS	Fri, Jul 22, 2005	4.95	5.12	4.91	5.00
2128	NASDAQ	CERS	Thu, Jul 21, 2005	5.00	5.15	4.92	4.95
2127	NASDAQ	CERS	Wed, Jul 20, 2005	4.80	5.00	4.80	4.90
2126	NASDAQ	CERS	Tue, Jul 19, 2005	4.84	4.90	4.76	4.80
2125	NASDAQ	CERS	Mon, Jul 18, 2005	4.84	4.89	4.75	4.87
2124	NASDAQ	CERS	Fri, Jul 15, 2005	4.74	4.90	4.65	4.79
2123	NASDAQ	CERS	Thu, Jul 14, 2005	4.89	5.01	4.54	4.74
2122	NASDAQ	CERS	Wed, Jul 13, 2005	5.00	5.05	4.83	4.89
2121	NASDAQ	CERS	Tue, Jul 12, 2005	4.84	5.05	4.65	4.90
2120	NASDAQ	CERS	Mon, Jul 11, 2005	4.57	4.85	4.45	4.84
2119	NASDAQ	CERS	Fri, Jul 8, 2005	4.57	4.60	4.39	4.51
2118	NASDAQ	CERS	Thu, Jul 7, 2005	4.34	4.52	4.31	4.50
2117	NASDAQ	CERS	Wed, Jul 6, 2005	4.49	4.54	4.27	4.43
2116	NASDAQ	CERS	Tue, Jul 5, 2005	4.46	4.58	4.38	4.41
2115	NASDAQ	CERS	Fri, Jul 1, 2005	4.40	4.44	4.34	4.43
2114	NASDAQ	CERS	Thu, Jun 30, 2005	4.46	4.48	4.27	4.43
2113	NASDAQ	CERS	Wed, Jun 29, 2005	4.70	4.70	4.41	4.55
2112	NASDAQ	CERS	Tue, Jun 28, 2005	4.57	4.75	4.47	4.51
2111	NASDAQ	CERS	Mon, Jun 27, 2005	4.15	4.68	4.08	4.59
2110	NASDAQ	CERS	Fri, Jun 24, 2005	4.02	4.35	4.02	4.08
2109	NASDAQ	CERS	Thu, Jun 23, 2005	4.35	4.35	4.16	4.16
2108	NASDAQ	CERS	Wed, Jun 22, 2005	4.19	4.31	4.14	4.30
2107	NASDAQ	CERS	Tue, Jun 21, 2005	4.10	4.14	4.00	4.14
2106	NASDAQ	CERS	Mon, Jun 20, 2005	4.10	4.10	4.02	4.05
2105	NASDAQ	CERS	Fri, Jun 17, 2005	4.15	4.15	4.00	4.08
2104	NASDAQ	CERS	Thu, Jun 16, 2005	3.94	4.09	3.94	4.09
2103	NASDAQ	CERS	Wed, Jun 15, 2005	4.04	4.22	3.95	3.99
2102	NASDAQ	CERS	Tue, Jun 14, 2005	4.13	4.13	3.96	4.12
2101	NASDAQ	CERS	Mon, Jun 13, 2005	4.21	4.24	4.08	4.14
2100	NASDAQ	CERS	Fri, Jun 10, 2005	4.15	4.21	4.05	4.14
2099	NASDAQ	CERS	Thu, Jun 9, 2005	4.10	4.20	4.05	4.15
2098	NASDAQ	CERS	Wed, Jun 8, 2005	4.16	4.17	4.01	4.08
2097	NASDAQ	CERS	Tue, Jun 7, 2005	4.20	4.25	4.08	4.17
2096	NASDAQ	CERS	Mon, Jun 6, 2005	4.11	4.35	4.11	4.21
2095	NASDAQ	CERS	Fri, Jun 3, 2005	4.25	4.29	4.02	4.05
2094	NASDAQ	CERS	Thu, Jun 2, 2005	4.17	4.25	4.09	4.24
2093	NASDAQ	CERS	Wed, Jun 1, 2005	4.16	4.24	4.05	4.20
2092	NASDAQ	CERS	Tue, May 31, 2005	4.00	4.20	4.00	4.09
2091	NASDAQ	CERS	Fri, May 27, 2005	4.00	4.26	4.00	4.07
2090	NASDAQ	CERS	Thu, May 26, 2005	3.89	4.05	3.87	4.02
2089	NASDAQ	CERS	Wed, May 25, 2005	4.09	4.10	3.89	3.90
2088	NASDAQ	CERS	Tue, May 24, 2005	4.10	4.27	3.94	4.03
2087	NASDAQ	CERS	Mon, May 23, 2005	4.24	4.27	4.03	4.10
2086	NASDAQ	CERS	Fri, May 20, 2005	4.09	4.24	4.09	4.20
2085	NASDAQ	CERS	Thu, May 19, 2005	4.24	4.24	4.06	4.16
2084	NASDAQ	CERS	Wed, May 18, 2005	4.17	4.24	4.12	4.19
2083	NASDAQ	CERS	Tue, May 17, 2005	4.15	4.16	4.01	4.08
2082	NASDAQ	CERS	Mon, May 16, 2005	4.18	4.25	4.08	4.16
2081	NASDAQ	CERS	Fri, May 13, 2005	4.17	4.17	4.01	4.13
2080	NASDAQ	CERS	Thu, May 12, 2005	4.19	4.30	4.14	4.26
2079	NASDAQ	CERS	Wed, May 11, 2005	4.31	4.35	4.09	4.15
2078	NASDAQ	CERS	Tue, May 10, 2005	4.20	4.35	4.20	4.27
2077	NASDAQ	CERS	Mon, May 9, 2005	4.12	4.45	4.12	4.34
2076	NASDAQ	CERS	Fri, May 6, 2005	4.12	4.35	4.12	4.22
2075	NASDAQ	CERS	Thu, May 5, 2005	3.75	4.10	3.75	4.08
2074	NASDAQ	CERS	Wed, May 4, 2005	3.90	4.03	3.61	3.90
2073	NASDAQ	CERS	Tue, May 3, 2005	3.42	3.99	3.15	3.90
2072	NASDAQ	CERS	Mon, May 2, 2005	3.67	3.67	3.43	3.44
2071	NASDAQ	CERS	Fri, Apr 29, 2005	3.65	3.66	3.52	3.66
2070	NASDAQ	CERS	Thu, Apr 28, 2005	3.59	3.66	3.57	3.65
2069	NASDAQ	CERS	Wed, Apr 27, 2005	3.54	3.71	3.51	3.65
2068	NASDAQ	CERS	Tue, Apr 26, 2005	3.43	3.75	3.43	3.61
2067	NASDAQ	CERS	Mon, Apr 25, 2005	3.51	3.55	3.42	3.55
2066	NASDAQ	CERS	Fri, Apr 22, 2005	3.29	3.65	3.26	3.60
2065	NASDAQ	CERS	Thu, Apr 21, 2005	3.40	3.48	3.23	3.37
2064	NASDAQ	CERS	Wed, Apr 20, 2005	3.80	3.86	3.37	3.42
2063	NASDAQ	CERS	Tue, Apr 19, 2005	3.50	3.65	3.49	3.61
2062	NASDAQ	CERS	Mon, Apr 18, 2005	3.50	3.59	3.49	3.51
2061	NASDAQ	CERS	Fri, Apr 15, 2005	3.50	3.89	3.45	3.51
2060	NASDAQ	CERS	Thu, Apr 14, 2005	3.50	3.64	3.50	3.59
2059	NASDAQ	CERS	Wed, Apr 13, 2005	3.61	3.70	3.58	3.58
2058	NASDAQ	CERS	Tue, Apr 12, 2005	3.73	3.84	3.57	3.60
2057	NASDAQ	CERS	Mon, Apr 11, 2005	3.80	3.86	3.80	3.80
2056	NASDAQ	CERS	Fri, Apr 8, 2005	3.88	3.88	3.80	3.82
2055	NASDAQ	CERS	Thu, Apr 7, 2005	3.71	3.92	3.68	3.85
2054	NASDAQ	CERS	Wed, Apr 6, 2005	3.77	3.90	3.67	3.74
2053	NASDAQ	CERS	Tue, Apr 5, 2005	3.85	3.95	3.51	3.87
2052	NASDAQ	CERS	Mon, Apr 4, 2005	3.13	3.80	3.13	3.74
2051	NASDAQ	CERS	Fri, Apr 1, 2005	3.09	3.26	3.04	3.22
2050	NASDAQ	CERS	Thu, Mar 31, 2005	3.00	3.09	3.00	3.07
2049	NASDAQ	CERS	Wed, Mar 30, 2005	3.09	3.10	2.95	3.05
2048	NASDAQ	CERS	Tue, Mar 29, 2005	3.10	3.25	2.93	3.13
2047	NASDAQ	CERS	Mon, Mar 28, 2005	3.37	3.50	3.20	3.32
2046	NASDAQ	CERS	Thu, Mar 24, 2005	3.50	3.52	3.20	3.37
2045	NASDAQ	CERS	Wed, Mar 23, 2005	3.76	3.77	3.52	3.55
2044	NASDAQ	CERS	Tue, Mar 22, 2005	3.69	3.79	3.64	3.74
2043	NASDAQ	CERS	Mon, Mar 21, 2005	3.71	3.86	3.69	3.70
2042	NASDAQ	CERS	Fri, Mar 18, 2005	3.64	3.87	3.64	3.81
2041	NASDAQ	CERS	Thu, Mar 17, 2005	3.79	3.92	3.65	3.74
2040	NASDAQ	CERS	Wed, Mar 16, 2005	3.78	3.88	3.75	3.79
2039	NASDAQ	CERS	Tue, Mar 15, 2005	3.72	3.94	3.66	3.78
2038	NASDAQ	CERS	Mon, Mar 14, 2005	3.85	3.88	3.59	3.72
2037	NASDAQ	CERS	Fri, Mar 11, 2005	3.74	3.99	3.70	3.82
2036	NASDAQ	CERS	Thu, Mar 10, 2005	4.07	4.25	3.80	3.80
2035	NASDAQ	CERS	Wed, Mar 9, 2005	4.28	4.30	4.00	4.15
2034	NASDAQ	CERS	Tue, Mar 8, 2005	4.30	4.36	4.22	4.28
2033	NASDAQ	CERS	Mon, Mar 7, 2005	4.50	4.50	4.20	4.30
2032	NASDAQ	CERS	Fri, Mar 4, 2005	4.62	4.62	4.41	4.43
2031	NASDAQ	CERS	Thu, Mar 3, 2005	4.52	4.69	4.40	4.50
2030	NASDAQ	CERS	Wed, Mar 2, 2005	4.50	4.50	4.42	4.46
2029	NASDAQ	CERS	Tue, Mar 1, 2005	4.40	4.73	4.40	4.57
2028	NASDAQ	CERS	Mon, Feb 28, 2005	4.50	4.50	4.35	4.45
2027	NASDAQ	CERS	Fri, Feb 25, 2005	4.51	4.60	4.40	4.51
2026	NASDAQ	CERS	Thu, Feb 24, 2005	4.39	4.58	4.23	4.53
2025	NASDAQ	CERS	Wed, Feb 23, 2005	4.47	4.80	4.05	4.47
2024	NASDAQ	CERS	Tue, Feb 22, 2005	4.70	4.85	4.64	4.66
2023	NASDAQ	CERS	Fri, Feb 18, 2005	4.90	4.90	4.61	4.68
2022	NASDAQ	CERS	Thu, Feb 17, 2005	5.04	5.06	4.57	4.79
2021	NASDAQ	CERS	Wed, Feb 16, 2005	4.54	5.08	4.51	4.83
2020	NASDAQ	CERS	Tue, Feb 15, 2005	4.10	4.55	4.10	4.55
2019	NASDAQ	CERS	Mon, Feb 14, 2005	3.98	4.15	3.95	4.09
2018	NASDAQ	CERS	Fri, Feb 11, 2005	4.10	4.12	3.85	3.89
2017	NASDAQ	CERS	Thu, Feb 10, 2005	4.04	4.20	3.92	4.05
2016	NASDAQ	CERS	Wed, Feb 9, 2005	3.77	3.91	3.77	3.85
2015	NASDAQ	CERS	Tue, Feb 8, 2005	3.98	3.98	3.75	3.83
2014	NASDAQ	CERS	Mon, Feb 7, 2005	4.20	4.20	3.75	3.86
2013	NASDAQ	CERS	Fri, Feb 4, 2005	3.99	4.17	3.88	4.00
2012	NASDAQ	CERS	Thu, Feb 3, 2005	3.95	4.00	3.65	3.89
2011	NASDAQ	CERS	Wed, Feb 2, 2005	3.65	3.86	3.65	3.77
2010	NASDAQ	CERS	Tue, Feb 1, 2005	3.42	3.65	3.42	3.65
2009	NASDAQ	CERS	Mon, Jan 31, 2005	3.43	3.52	3.29	3.45
2008	NASDAQ	CERS	Fri, Jan 28, 2005	3.36	3.41	3.20	3.30
2007	NASDAQ	CERS	Thu, Jan 27, 2005	3.45	3.45	3.37	3.43
2006	NASDAQ	CERS	Wed, Jan 26, 2005	3.54	3.54	3.33	3.43
2005	NASDAQ	CERS	Tue, Jan 25, 2005	3.43	3.54	3.42	3.45
2004	NASDAQ	CERS	Mon, Jan 24, 2005	3.59	3.59	3.42	3.42
2003	NASDAQ	CERS	Fri, Jan 21, 2005	3.60	3.60	3.48	3.48
2002	NASDAQ	CERS	Thu, Jan 20, 2005	3.50	3.59	3.40	3.55
2001	NASDAQ	CERS	Wed, Jan 19, 2005	3.44	3.52	3.42	3.48
2000	NASDAQ	CERS	Tue, Jan 18, 2005	3.31	3.45	3.31	3.42
1999	NASDAQ	CERS	Fri, Jan 14, 2005	3.31	3.45	3.31	3.34
1998	NASDAQ	CERS	Thu, Jan 13, 2005	3.56	3.56	3.34	3.37
1997	NASDAQ	CERS	Wed, Jan 12, 2005	3.31	3.43	3.16	3.43
1996	NASDAQ	CERS	Tue, Jan 11, 2005	3.54	3.56	3.30	3.38
1995	NASDAQ	CERS	Mon, Jan 10, 2005	3.64	3.67	3.50	3.55
1994	NASDAQ	CERS	Fri, Jan 7, 2005	3.43	3.62	3.38	3.50
1993	NASDAQ	CERS	Thu, Jan 6, 2005	3.39	3.44	3.30	3.40
1992	NASDAQ	CERS	Wed, Jan 5, 2005	3.38	3.43	3.25	3.39
1991	NASDAQ	CERS	Tue, Jan 4, 2005	3.15	3.47	3.11	3.31
1990	NASDAQ	CERS	Mon, Jan 3, 2005	2.95	3.17	2.95	3.10
1989	NASDAQ	CERS	Fri, Dec 31, 2004	3.04	3.04	2.95	2.95
1988	NASDAQ	CERS	Thu, Dec 30, 2004	2.98	3.09	2.97	2.99
1987	NASDAQ	CERS	Wed, Dec 29, 2004	3.09	3.20	2.94	2.97
1986	NASDAQ	CERS	Tue, Dec 28, 2004	3.16	3.25	3.12	3.16
1985	NASDAQ	CERS	Mon, Dec 27, 2004	3.05	3.24	2.86	3.12
1984	NASDAQ	CERS	Thu, Dec 23, 2004	3.01	3.07	2.93	3.00
1983	NASDAQ	CERS	Wed, Dec 22, 2004	2.91	3.20	2.90	2.97
1982	NASDAQ	CERS	Tue, Dec 21, 2004	2.95	2.96	2.81	2.87
1981	NASDAQ	CERS	Mon, Dec 20, 2004	3.05	3.05	2.96	2.97
1980	NASDAQ	CERS	Fri, Dec 17, 2004	2.95	3.06	2.95	3.03
1979	NASDAQ	CERS	Thu, Dec 16, 2004	3.05	3.16	2.95	3.00
1978	NASDAQ	CERS	Wed, Dec 15, 2004	3.10	3.19	3.07	3.16
1977	NASDAQ	CERS	Tue, Dec 14, 2004	3.27	3.30	3.11	3.13
1976	NASDAQ	CERS	Mon, Dec 13, 2004	3.00	3.25	3.00	3.24
1975	NASDAQ	CERS	Fri, Dec 10, 2004	2.79	3.04	2.79	3.00
1974	NASDAQ	CERS	Thu, Dec 9, 2004	2.88	3.05	2.81	2.89
1973	NASDAQ	CERS	Wed, Dec 8, 2004	2.82	3.00	2.80	2.82
1972	NASDAQ	CERS	Tue, Dec 7, 2004	3.09	3.13	2.82	2.85
1971	NASDAQ	CERS	Mon, Dec 6, 2004	2.84	3.14	2.83	3.00
1970	NASDAQ	CERS	Fri, Dec 3, 2004	2.69	3.00	2.61	2.91
1969	NASDAQ	CERS	Thu, Dec 2, 2004	2.62	2.66	2.56	2.66
1968	NASDAQ	CERS	Wed, Dec 1, 2004	2.64	2.65	2.57	2.57
1967	NASDAQ	CERS	Tue, Nov 30, 2004	2.65	2.65	2.60	2.63
1966	NASDAQ	CERS	Mon, Nov 29, 2004	2.70	2.70	2.60	2.65
1965	NASDAQ	CERS	Fri, Nov 26, 2004	2.56	2.68	2.56	2.68
1964	NASDAQ	CERS	Wed, Nov 24, 2004	2.56	2.71	2.56	2.67
1963	NASDAQ	CERS	Tue, Nov 23, 2004	2.70	2.70	2.59	2.59
1962	NASDAQ	CERS	Mon, Nov 22, 2004	2.66	2.67	2.50	2.61
1961	NASDAQ	CERS	Fri, Nov 19, 2004	2.71	2.71	2.60	2.67
1960	NASDAQ	CERS	Thu, Nov 18, 2004	2.50	2.63	2.48	2.55
1959	NASDAQ	CERS	Wed, Nov 17, 2004	2.45	2.54	2.45	2.52
1958	NASDAQ	CERS	Tue, Nov 16, 2004	2.44	2.54	2.44	2.53
1957	NASDAQ	CERS	Mon, Nov 15, 2004	2.51	2.62	2.48	2.51
1956	NASDAQ	CERS	Fri, Nov 12, 2004	2.61	2.62	2.56	2.59
1955	NASDAQ	CERS	Thu, Nov 11, 2004	2.70	2.73	2.58	2.60
1954	NASDAQ	CERS	Wed, Nov 10, 2004	2.57	2.64	2.51	2.58
1953	NASDAQ	CERS	Tue, Nov 9, 2004	2.55	2.60	2.53	2.56
1952	NASDAQ	CERS	Mon, Nov 8, 2004	2.50	2.57	2.50	2.55
1951	NASDAQ	CERS	Fri, Nov 5, 2004	2.36	2.60	2.36	2.53
1950	NASDAQ	CERS	Thu, Nov 4, 2004	2.30	2.47	2.30	2.43
1949	NASDAQ	CERS	Wed, Nov 3, 2004	2.49	2.52	2.35	2.37
1948	NASDAQ	CERS	Tue, Nov 2, 2004	2.27	2.48	2.21	2.47
1947	NASDAQ	CERS	Mon, Nov 1, 2004	2.35	2.44	2.35	2.44
1946	NASDAQ	CERS	Fri, Oct 29, 2004	2.41	2.46	2.36	2.36
1945	NASDAQ	CERS	Thu, Oct 28, 2004	2.45	2.49	2.42	2.44
1944	NASDAQ	CERS	Wed, Oct 27, 2004	2.54	2.54	2.46	2.46
1943	NASDAQ	CERS	Tue, Oct 26, 2004	2.55	2.55	2.47	2.49
1942	NASDAQ	CERS	Mon, Oct 25, 2004	2.50	2.59	2.44	2.47
1941	NASDAQ	CERS	Fri, Oct 22, 2004	2.50	2.61	2.42	2.55
1940	NASDAQ	CERS	Thu, Oct 21, 2004	2.51	2.59	2.45	2.47
1939	NASDAQ	CERS	Wed, Oct 20, 2004	2.43	2.54	2.40	2.49
1938	NASDAQ	CERS	Tue, Oct 19, 2004	2.52	2.64	2.45	2.54
1937	NASDAQ	CERS	Mon, Oct 18, 2004	2.77	2.77	2.57	2.62
1936	NASDAQ	CERS	Fri, Oct 15, 2004	2.63	2.78	2.61	2.72
1935	NASDAQ	CERS	Thu, Oct 14, 2004	2.72	2.72	2.55	2.63
1934	NASDAQ	CERS	Wed, Oct 13, 2004	2.50	2.55	2.45	2.45
1933	NASDAQ	CERS	Tue, Oct 12, 2004	2.53	2.53	2.35	2.40
1932	NASDAQ	CERS	Mon, Oct 11, 2004	2.25	2.53	2.25	2.48
1931	NASDAQ	CERS	Fri, Oct 8, 2004	2.29	2.45	2.29	2.41
1930	NASDAQ	CERS	Thu, Oct 7, 2004	2.37	2.40	2.34	2.40
1929	NASDAQ	CERS	Wed, Oct 6, 2004	2.29	2.37	2.25	2.36
1928	NASDAQ	CERS	Tue, Oct 5, 2004	2.27	2.40	2.27	2.29
1927	NASDAQ	CERS	Mon, Oct 4, 2004	2.40	2.53	2.26	2.27
1926	NASDAQ	CERS	Fri, Oct 1, 2004	2.48	2.55	2.40	2.40
1925	NASDAQ	CERS	Thu, Sep 30, 2004	2.48	2.49	2.35	2.41
1924	NASDAQ	CERS	Wed, Sep 29, 2004	2.40	2.42	2.31	2.39
1923	NASDAQ	CERS	Tue, Sep 28, 2004	2.17	2.35	2.17	2.32
1922	NASDAQ	CERS	Mon, Sep 27, 2004	2.26	2.31	2.18	2.20
1921	NASDAQ	CERS	Fri, Sep 24, 2004	2.19	2.40	2.17	2.28
1920	NASDAQ	CERS	Thu, Sep 23, 2004	2.52	2.59	2.28	2.39
1919	NASDAQ	CERS	Wed, Sep 22, 2004	2.10	2.73	2.06	2.47
1918	NASDAQ	CERS	Tue, Sep 21, 2004	2.10	2.13	2.05	2.11
1917	NASDAQ	CERS	Mon, Sep 20, 2004	2.04	2.15	2.04	2.11
1916	NASDAQ	CERS	Fri, Sep 17, 2004	2.15	2.16	2.10	2.10
1915	NASDAQ	CERS	Thu, Sep 16, 2004	2.14	2.14	2.06	2.11
1914	NASDAQ	CERS	Wed, Sep 15, 2004	2.13	2.14	2.01	2.08
1913	NASDAQ	CERS	Tue, Sep 14, 2004	2.00	2.10	2.00	2.08
1912	NASDAQ	CERS	Mon, Sep 13, 2004	2.02	2.15	1.88	2.10
1911	NASDAQ	CERS	Fri, Sep 10, 2004	2.05	2.11	2.05	2.07
1910	NASDAQ	CERS	Thu, Sep 9, 2004	2.04	2.16	2.04	2.08
1909	NASDAQ	CERS	Wed, Sep 8, 2004	2.19	2.19	2.07	2.12
1908	NASDAQ	CERS	Tue, Sep 7, 2004	2.09	2.13	2.03	2.12
1907	NASDAQ	CERS	Fri, Sep 3, 2004	2.10	2.15	2.01	2.05
1906	NASDAQ	CERS	Thu, Sep 2, 2004	2.14	2.20	2.06	2.13
1905	NASDAQ	CERS	Wed, Sep 1, 2004	2.16	2.19	2.07	2.07
1904	NASDAQ	CERS	Tue, Aug 31, 2004	2.22	2.22	2.08	2.14
1903	NASDAQ	CERS	Mon, Aug 30, 2004	2.19	2.21	2.16	2.19
1902	NASDAQ	CERS	Fri, Aug 27, 2004	2.18	2.23	2.14	2.20
1901	NASDAQ	CERS	Thu, Aug 26, 2004	2.13	2.18	2.12	2.17
1900	NASDAQ	CERS	Wed, Aug 25, 2004	2.05	2.25	2.05	2.13
1899	NASDAQ	CERS	Tue, Aug 24, 2004	2.15	2.17	2.07	2.17
1898	NASDAQ	CERS	Mon, Aug 23, 2004	2.10	2.17	1.99	2.09
1897	NASDAQ	CERS	Fri, Aug 20, 2004	2.09	2.17	2.05	2.16
1896	NASDAQ	CERS	Thu, Aug 19, 2004	1.94	2.09	1.90	2.08
1895	NASDAQ	CERS	Wed, Aug 18, 2004	1.97	2.03	1.93	1.99
1894	NASDAQ	CERS	Tue, Aug 17, 2004	1.93	2.00	1.90	1.91
1893	NASDAQ	CERS	Mon, Aug 16, 2004	1.94	2.08	1.94	1.94
1892	NASDAQ	CERS	Fri, Aug 13, 2004	2.05	2.05	1.97	1.98
1891	NASDAQ	CERS	Thu, Aug 12, 2004	2.09	2.09	1.98	2.05
1890	NASDAQ	CERS	Wed, Aug 11, 2004	1.99	2.04	1.93	2.04
1889	NASDAQ	CERS	Tue, Aug 10, 2004	2.05	2.05	1.98	2.02
1888	NASDAQ	CERS	Mon, Aug 9, 2004	2.02	2.39	2.02	2.05
1887	NASDAQ	CERS	Fri, Aug 6, 2004	2.21	2.21	2.05	2.05
1886	NASDAQ	CERS	Thu, Aug 5, 2004	2.17	2.23	2.13	2.15
1885	NASDAQ	CERS	Wed, Aug 4, 2004	2.27	2.27	2.17	2.19
1884	NASDAQ	CERS	Tue, Aug 3, 2004	2.06	2.45	1.97	2.23
1883	NASDAQ	CERS	Mon, Aug 2, 2004	2.20	2.20	2.07	2.11
1882	NASDAQ	CERS	Fri, Jul 30, 2004	2.20	2.27	2.03	2.15
1881	NASDAQ	CERS	Thu, Jul 29, 2004	2.14	2.16	1.96	2.16
1880	NASDAQ	CERS	Wed, Jul 28, 2004	1.97	2.28	1.86	1.97
1879	NASDAQ	CERS	Tue, Jul 27, 2004	1.79	1.97	1.71	1.89
1878	NASDAQ	CERS	Mon, Jul 26, 2004	1.94	2.02	1.85	1.85
1877	NASDAQ	CERS	Fri, Jul 23, 2004	1.71	1.97	1.60	1.95
1876	NASDAQ	CERS	Thu, Jul 22, 2004	2.20	2.20	1.72	1.94
1875	NASDAQ	CERS	Wed, Jul 21, 2004	2.19	2.27	2.15	2.15
1874	NASDAQ	CERS	Tue, Jul 20, 2004	2.26	2.26	2.16	2.19
1873	NASDAQ	CERS	Mon, Jul 19, 2004	2.17	2.28	2.17	2.23
1872	NASDAQ	CERS	Fri, Jul 16, 2004	2.21	2.26	2.20	2.20
1871	NASDAQ	CERS	Thu, Jul 15, 2004	2.22	2.27	2.20	2.27
1870	NASDAQ	CERS	Wed, Jul 14, 2004	2.20	2.26	2.17	2.26
1869	NASDAQ	CERS	Tue, Jul 13, 2004	2.25	2.36	2.22	2.26
1868	NASDAQ	CERS	Mon, Jul 12, 2004	2.36	2.36	2.26	2.29
1867	NASDAQ	CERS	Fri, Jul 9, 2004	2.30	2.34	2.27	2.30
1866	NASDAQ	CERS	Thu, Jul 8, 2004	2.44	2.44	2.30	2.31
1865	NASDAQ	CERS	Wed, Jul 7, 2004	2.39	2.39	2.30	2.34
1864	NASDAQ	CERS	Tue, Jul 6, 2004	2.32	2.42	2.32	2.37
1863	NASDAQ	CERS	Fri, Jul 2, 2004	2.38	2.40	2.34	2.38
1862	NASDAQ	CERS	Thu, Jul 1, 2004	2.32	2.39	2.28	2.34
1861	NASDAQ	CERS	Wed, Jun 30, 2004	2.41	2.43	2.32	2.39
1860	NASDAQ	CERS	Tue, Jun 29, 2004	2.32	2.44	2.22	2.43
1859	NASDAQ	CERS	Mon, Jun 28, 2004	2.32	2.35	2.25	2.28
1858	NASDAQ	CERS	Fri, Jun 25, 2004	2.30	3.25	2.24	2.29
1857	NASDAQ	CERS	Thu, Jun 24, 2004	2.35	2.35	2.26	2.31
1856	NASDAQ	CERS	Wed, Jun 23, 2004	2.28	2.35	2.24	2.30
1855	NASDAQ	CERS	Tue, Jun 22, 2004	2.36	2.36	2.24	2.28
1854	NASDAQ	CERS	Mon, Jun 21, 2004	2.25	2.36	2.25	2.27
1853	NASDAQ	CERS	Fri, Jun 18, 2004	2.23	2.33	2.10	2.25
1852	NASDAQ	CERS	Thu, Jun 17, 2004	2.34	2.37	2.26	2.26
1851	NASDAQ	CERS	Wed, Jun 16, 2004	2.32	2.35	2.23	2.25
1850	NASDAQ	CERS	Tue, Jun 15, 2004	2.27	2.33	2.21	2.23
1849	NASDAQ	CERS	Mon, Jun 14, 2004	2.39	2.39	2.25	2.27
1848	NASDAQ	CERS	Thu, Jun 10, 2004	2.35	2.39	2.26	2.28
1847	NASDAQ	CERS	Wed, Jun 9, 2004	2.39	2.42	2.33	2.35
1846	NASDAQ	CERS	Tue, Jun 8, 2004	2.52	2.52	2.30	2.42
1845	NASDAQ	CERS	Mon, Jun 7, 2004	2.44	2.55	2.38	2.48
1844	NASDAQ	CERS	Fri, Jun 4, 2004	2.32	2.37	2.25	2.36
1843	NASDAQ	CERS	Thu, Jun 3, 2004	2.29	2.38	2.23	2.25
1842	NASDAQ	CERS	Wed, Jun 2, 2004	2.24	2.33	2.18	2.30
1841	NASDAQ	CERS	Tue, Jun 1, 2004	2.23	2.24	2.13	2.20
1840	NASDAQ	CERS	Fri, May 28, 2004	2.16	2.22	2.12	2.16
1839	NASDAQ	CERS	Thu, May 27, 2004	2.26	2.26	2.10	2.10
1838	NASDAQ	CERS	Wed, May 26, 2004	2.36	2.37	2.15	2.22
1837	NASDAQ	CERS	Tue, May 25, 2004	2.20	2.29	2.15	2.29
1836	NASDAQ	CERS	Mon, May 24, 2004	2.40	2.40	2.18	2.22
1835	NASDAQ	CERS	Fri, May 21, 2004	2.32	2.33	2.18	2.25
1834	NASDAQ	CERS	Thu, May 20, 2004	2.32	2.47	2.21	2.23
1833	NASDAQ	CERS	Wed, May 19, 2004	2.93	3.33	2.30	2.39
1832	NASDAQ	CERS	Tue, May 18, 2004	2.76	2.76	2.69	2.74
1831	NASDAQ	CERS	Mon, May 17, 2004	2.80	2.80	2.68	2.72
1830	NASDAQ	CERS	Fri, May 14, 2004	2.88	2.90	2.72	2.79
1829	NASDAQ	CERS	Thu, May 13, 2004	2.81	2.95	2.81	2.83
1828	NASDAQ	CERS	Wed, May 12, 2004	3.05	3.08	2.83	2.89
1827	NASDAQ	CERS	Tue, May 11, 2004	3.14	3.22	3.00	3.09
1826	NASDAQ	CERS	Mon, May 10, 2004	3.14	3.29	3.10	3.14
1825	NASDAQ	CERS	Fri, May 7, 2004	3.15	3.21	3.08	3.10
1824	NASDAQ	CERS	Thu, May 6, 2004	3.30	3.37	3.10	3.16
1823	NASDAQ	CERS	Wed, May 5, 2004	3.45	3.45	3.06	3.20
1822	NASDAQ	CERS	Tue, May 4, 2004	3.46	3.51	3.30	3.36
1821	NASDAQ	CERS	Mon, May 3, 2004	3.30	3.54	3.21	3.46
1820	NASDAQ	CERS	Fri, Apr 30, 2004	3.57	3.58	3.15	3.25
1819	NASDAQ	CERS	Thu, Apr 29, 2004	3.96	3.96	3.52	3.58
1818	NASDAQ	CERS	Wed, Apr 28, 2004	3.88	3.92	3.78	3.81
1817	NASDAQ	CERS	Tue, Apr 27, 2004	3.85	4.07	3.79	3.93
1816	NASDAQ	CERS	Mon, Apr 26, 2004	3.99	4.24	3.80	3.92
1815	NASDAQ	CERS	Fri, Apr 23, 2004	3.77	4.06	3.70	3.96
1814	NASDAQ	CERS	Thu, Apr 22, 2004	3.85	3.90	3.65	3.72
1813	NASDAQ	CERS	Wed, Apr 21, 2004	4.01	5.50	3.88	4.00
1812	NASDAQ	CERS	Tue, Apr 20, 2004	3.50	3.57	3.45	3.53
1811	NASDAQ	CERS	Mon, Apr 19, 2004	3.50	3.64	3.45	3.49
1810	NASDAQ	CERS	Fri, Apr 16, 2004	3.71	3.75	3.60	3.61
1809	NASDAQ	CERS	Thu, Apr 15, 2004	3.70	3.84	3.69	3.71
1808	NASDAQ	CERS	Wed, Apr 14, 2004	3.65	3.78	3.64	3.69
1807	NASDAQ	CERS	Tue, Apr 13, 2004	3.88	3.90	3.71	3.71
1806	NASDAQ	CERS	Mon, Apr 12, 2004	3.97	3.97	3.80	3.83
1805	NASDAQ	CERS	Thu, Apr 8, 2004	4.00	4.05	3.91	3.96
1804	NASDAQ	CERS	Wed, Apr 7, 2004	4.17	4.21	4.00	4.01
1803	NASDAQ	CERS	Tue, Apr 6, 2004	4.17	4.27	4.12	4.18
1802	NASDAQ	CERS	Mon, Apr 5, 2004	4.04	4.23	4.00	4.11
1801	NASDAQ	CERS	Fri, Apr 2, 2004	3.83	4.05	3.70	4.00
1800	NASDAQ	CERS	Thu, Apr 1, 2004	3.44	3.70	3.40	3.67
1799	NASDAQ	CERS	Wed, Mar 31, 2004	3.34	3.61	3.32	3.41
1798	NASDAQ	CERS	Tue, Mar 30, 2004	3.53	3.65	3.48	3.52
1797	NASDAQ	CERS	Mon, Mar 29, 2004	3.54	3.67	3.44	3.50
1796	NASDAQ	CERS	Fri, Mar 26, 2004	3.54	3.54	3.44	3.46
1795	NASDAQ	CERS	Thu, Mar 25, 2004	3.45	3.54	3.44	3.50
1794	NASDAQ	CERS	Wed, Mar 24, 2004	3.46	3.46	3.37	3.40
1793	NASDAQ	CERS	Tue, Mar 23, 2004	3.40	3.54	3.35	3.40
1792	NASDAQ	CERS	Mon, Mar 22, 2004	3.64	3.64	3.36	3.38
1791	NASDAQ	CERS	Fri, Mar 19, 2004	3.79	3.87	3.54	3.56
1790	NASDAQ	CERS	Thu, Mar 18, 2004	3.70	3.75	3.63	3.68
1789	NASDAQ	CERS	Wed, Mar 17, 2004	3.70	3.85	3.70	3.78
1788	NASDAQ	CERS	Tue, Mar 16, 2004	3.71	3.79	3.67	3.77
1787	NASDAQ	CERS	Mon, Mar 15, 2004	3.75	3.83	3.69	3.75
1786	NASDAQ	CERS	Fri, Mar 12, 2004	3.75	3.79	3.68	3.79
1785	NASDAQ	CERS	Thu, Mar 11, 2004	3.64	3.77	3.64	3.71
1784	NASDAQ	CERS	Wed, Mar 10, 2004	3.83	3.87	3.70	3.72
1783	NASDAQ	CERS	Tue, Mar 9, 2004	3.83	3.93	3.79	3.85
1782	NASDAQ	CERS	Mon, Mar 8, 2004	4.05	4.10	3.81	3.89
1781	NASDAQ	CERS	Fri, Mar 5, 2004	3.88	4.09	3.85	4.06
1780	NASDAQ	CERS	Thu, Mar 4, 2004	3.89	3.90	3.80	3.87
1779	NASDAQ	CERS	Wed, Mar 3, 2004	3.80	3.93	3.75	3.75
1778	NASDAQ	CERS	Tue, Mar 2, 2004	3.91	3.93	3.80	3.80
1777	NASDAQ	CERS	Mon, Mar 1, 2004	3.95	3.95	3.80	3.86
1776	NASDAQ	CERS	Fri, Feb 27, 2004	3.91	3.93	3.84	3.88
1775	NASDAQ	CERS	Thu, Feb 26, 2004	3.89	3.90	3.83	3.83
1774	NASDAQ	CERS	Wed, Feb 25, 2004	3.93	3.95	3.77	3.89
1773	NASDAQ	CERS	Tue, Feb 24, 2004	3.90	3.99	3.88	3.88
1772	NASDAQ	CERS	Mon, Feb 23, 2004	3.95	4.01	3.86	3.88
1771	NASDAQ	CERS	Fri, Feb 20, 2004	3.85	3.95	3.84	3.87
1770	NASDAQ	CERS	Thu, Feb 19, 2004	3.95	4.06	3.88	3.88
1769	NASDAQ	CERS	Wed, Feb 18, 2004	3.91	3.99	3.88	3.90
1768	NASDAQ	CERS	Tue, Feb 17, 2004	4.07	4.10	3.86	3.92
1767	NASDAQ	CERS	Fri, Feb 13, 2004	4.15	4.15	4.00	4.01
1766	NASDAQ	CERS	Thu, Feb 12, 2004	4.08	4.23	4.07	4.07
1765	NASDAQ	CERS	Wed, Feb 11, 2004	4.02	4.12	4.02	4.12
1764	NASDAQ	CERS	Tue, Feb 10, 2004	4.01	4.08	4.00	4.05
1763	NASDAQ	CERS	Mon, Feb 9, 2004	4.07	4.20	4.00	4.07
1762	NASDAQ	CERS	Fri, Feb 6, 2004	4.35	4.35	4.21	4.24
1761	NASDAQ	CERS	Thu, Feb 5, 2004	4.27	4.34	4.25	4.25
1760	NASDAQ	CERS	Wed, Feb 4, 2004	4.35	4.38	4.21	4.21
1759	NASDAQ	CERS	Tue, Feb 3, 2004	4.35	4.45	4.33	4.35
1758	NASDAQ	CERS	Mon, Feb 2, 2004	4.30	4.45	4.25	4.33
1757	NASDAQ	CERS	Fri, Jan 30, 2004	4.42	4.43	4.31	4.33
1756	NASDAQ	CERS	Thu, Jan 29, 2004	4.35	4.59	4.28	4.35
1755	NASDAQ	CERS	Wed, Jan 28, 2004	4.60	4.75	4.38	4.42
1754	NASDAQ	CERS	Tue, Jan 27, 2004	4.74	4.74	4.35	4.49
1753	NASDAQ	CERS	Mon, Jan 26, 2004	4.60	4.73	4.50	4.61
1752	NASDAQ	CERS	Fri, Jan 23, 2004	4.65	4.68	4.50	4.63
1751	NASDAQ	CERS	Thu, Jan 22, 2004	4.76	4.76	4.50	4.52
1750	NASDAQ	CERS	Wed, Jan 21, 2004	4.80	4.81	4.57	4.61
1749	NASDAQ	CERS	Tue, Jan 20, 2004	4.59	4.95	4.59	4.71
1748	NASDAQ	CERS	Fri, Jan 16, 2004	4.41	4.61	4.41	4.56
1747	NASDAQ	CERS	Thu, Jan 15, 2004	4.59	4.59	4.35	4.43
1746	NASDAQ	CERS	Wed, Jan 14, 2004	4.51	4.65	4.42	4.57
1745	NASDAQ	CERS	Tue, Jan 13, 2004	4.25	4.50	4.25	4.49
1744	NASDAQ	CERS	Mon, Jan 12, 2004	4.19	4.35	4.16	4.30
1743	NASDAQ	CERS	Fri, Jan 9, 2004	4.33	4.40	4.17	4.17
1742	NASDAQ	CERS	Thu, Jan 8, 2004	4.34	4.35	4.23	4.29
1741	NASDAQ	CERS	Wed, Jan 7, 2004	4.30	4.35	4.21	4.29
1740	NASDAQ	CERS	Tue, Jan 6, 2004	4.44	4.45	4.21	4.30
1739	NASDAQ	CERS	Mon, Jan 5, 2004	4.58	4.59	4.38	4.43
1738	NASDAQ	CERS	Fri, Jan 2, 2004	4.59	4.73	4.45	4.50
1737	NASDAQ	CERS	Wed, Dec 31, 2003	4.60	4.70	4.41	4.54
1736	NASDAQ	CERS	Tue, Dec 30, 2003	4.71	4.79	4.61	4.68
1735	NASDAQ	CERS	Mon, Dec 29, 2003	4.43	4.75	4.40	4.75
1734	NASDAQ	CERS	Fri, Dec 26, 2003	4.45	4.47	4.36	4.44
1733	NASDAQ	CERS	Wed, Dec 24, 2003	4.40	4.50	4.30	4.35
1732	NASDAQ	CERS	Tue, Dec 23, 2003	4.24	4.43	4.12	4.42
1731	NASDAQ	CERS	Mon, Dec 22, 2003	4.01	4.20	4.01	4.20
1730	NASDAQ	CERS	Fri, Dec 19, 2003	4.04	4.08	3.90	4.07
1729	NASDAQ	CERS	Thu, Dec 18, 2003	3.90	4.01	3.90	3.95
1728	NASDAQ	CERS	Wed, Dec 17, 2003	3.86	4.00	3.86	3.91
1727	NASDAQ	CERS	Tue, Dec 16, 2003	3.85	3.96	3.85	3.88
1726	NASDAQ	CERS	Mon, Dec 15, 2003	4.24	4.24	3.88	3.92
1725	NASDAQ	CERS	Fri, Dec 12, 2003	4.23	4.27	3.88	4.00
1724	NASDAQ	CERS	Thu, Dec 11, 2003	3.87	4.73	3.80	4.20
1723	NASDAQ	CERS	Wed, Dec 10, 2003	3.73	3.87	3.68	3.86
1722	NASDAQ	CERS	Tue, Dec 9, 2003	3.90	3.90	3.68	3.71
1721	NASDAQ	CERS	Mon, Dec 8, 2003	3.85	3.90	3.75	3.90
1720	NASDAQ	CERS	Fri, Dec 5, 2003	3.76	3.90	3.76	3.80
1719	NASDAQ	CERS	Thu, Dec 4, 2003	3.61	3.80	3.61	3.76
1718	NASDAQ	CERS	Wed, Dec 3, 2003	3.60	3.78	3.60	3.68
1717	NASDAQ	CERS	Tue, Dec 2, 2003	3.77	3.77	3.54	3.65
1716	NASDAQ	CERS	Mon, Dec 1, 2003	3.47	3.73	3.41	3.73
1715	NASDAQ	CERS	Fri, Nov 28, 2003	3.55	3.55	3.40	3.40
1714	NASDAQ	CERS	Wed, Nov 26, 2003	3.59	3.63	3.42	3.52
1713	NASDAQ	CERS	Tue, Nov 25, 2003	3.66	3.70	3.50	3.59
1712	NASDAQ	CERS	Mon, Nov 24, 2003	3.66	3.79	3.61	3.68
1711	NASDAQ	CERS	Fri, Nov 21, 2003	3.79	3.87	3.62	3.65
1710	NASDAQ	CERS	Thu, Nov 20, 2003	4.00	4.01	3.65	3.71
1709	NASDAQ	CERS	Wed, Nov 19, 2003	4.00	4.09	3.95	3.98
1708	NASDAQ	CERS	Tue, Nov 18, 2003	4.19	4.19	3.99	4.01
1707	NASDAQ	CERS	Mon, Nov 17, 2003	4.21	4.27	4.09	4.10
1706	NASDAQ	CERS	Fri, Nov 14, 2003	4.21	4.27	4.19	4.23
1705	NASDAQ	CERS	Thu, Nov 13, 2003	4.30	4.33	4.20	4.25
1704	NASDAQ	CERS	Wed, Nov 12, 2003	4.23	4.38	4.23	4.33
1703	NASDAQ	CERS	Tue, Nov 11, 2003	4.40	4.43	4.23	4.30
1702	NASDAQ	CERS	Mon, Nov 10, 2003	4.39	4.48	4.29	4.40
1701	NASDAQ	CERS	Fri, Nov 7, 2003	4.37	4.38	4.30	4.35
1700	NASDAQ	CERS	Thu, Nov 6, 2003	4.46	4.48	4.30	4.35
1699	NASDAQ	CERS	Wed, Nov 5, 2003	4.47	4.49	4.35	4.40
1698	NASDAQ	CERS	Tue, Nov 4, 2003	4.58	4.64	4.35	4.50
1697	NASDAQ	CERS	Mon, Nov 3, 2003	4.43	4.64	4.43	4.60
1696	NASDAQ	CERS	Fri, Oct 31, 2003	4.42	4.50	4.31	4.49
1695	NASDAQ	CERS	Thu, Oct 30, 2003	4.38	4.45	4.25	4.37
1694	NASDAQ	CERS	Wed, Oct 29, 2003	4.42	4.46	4.37	4.40
1693	NASDAQ	CERS	Tue, Oct 28, 2003	4.42	4.50	4.35	4.46
1692	NASDAQ	CERS	Mon, Oct 27, 2003	4.40	4.50	4.31	4.35
1691	NASDAQ	CERS	Fri, Oct 24, 2003	4.42	4.43	4.28	4.31
1690	NASDAQ	CERS	Thu, Oct 23, 2003	4.24	4.40	4.20	4.39
1689	NASDAQ	CERS	Wed, Oct 22, 2003	4.36	4.37	4.17	4.19
1688	NASDAQ	CERS	Tue, Oct 21, 2003	4.40	4.50	4.36	4.37
1687	NASDAQ	CERS	Mon, Oct 20, 2003	4.54	4.54	4.38	4.45
1686	NASDAQ	CERS	Fri, Oct 17, 2003	4.30	4.57	4.28	4.49
1685	NASDAQ	CERS	Thu, Oct 16, 2003	4.72	4.72	4.30	4.34
1684	NASDAQ	CERS	Wed, Oct 15, 2003	5.10	5.15	5.02	5.12
1683	NASDAQ	CERS	Tue, Oct 14, 2003	5.10	5.15	4.95	5.10
1682	NASDAQ	CERS	Mon, Oct 13, 2003	5.03	5.12	5.00	5.10
1681	NASDAQ	CERS	Fri, Oct 10, 2003	5.08	5.15	5.00	5.02
1680	NASDAQ	CERS	Thu, Oct 9, 2003	5.16	5.20	5.04	5.06
1679	NASDAQ	CERS	Wed, Oct 8, 2003	5.16	5.24	5.02	5.09
1678	NASDAQ	CERS	Tue, Oct 7, 2003	5.03	5.28	5.00	5.21
1677	NASDAQ	CERS	Mon, Oct 6, 2003	5.25	5.27	4.92	5.08
1676	NASDAQ	CERS	Fri, Oct 3, 2003	5.41	5.49	5.15	5.17
1675	NASDAQ	CERS	Thu, Oct 2, 2003	4.79	5.23	4.69	5.18
1674	NASDAQ	CERS	Wed, Oct 1, 2003	4.69	4.78	4.61	4.70
1673	NASDAQ	CERS	Tue, Sep 30, 2003	4.68	4.82	4.62	4.64
1672	NASDAQ	CERS	Mon, Sep 29, 2003	4.70	4.81	4.63	4.68
1671	NASDAQ	CERS	Fri, Sep 26, 2003	4.94	5.02	4.57	4.73
1670	NASDAQ	CERS	Thu, Sep 25, 2003	5.21	5.23	4.98	5.01
1669	NASDAQ	CERS	Wed, Sep 24, 2003	5.37	5.39	5.21	5.21
1668	NASDAQ	CERS	Tue, Sep 23, 2003	5.14	5.38	5.13	5.26
1667	NASDAQ	CERS	Mon, Sep 22, 2003	5.19	5.22	5.05	5.07
1666	NASDAQ	CERS	Fri, Sep 19, 2003	5.20	5.22	5.06	5.13
1665	NASDAQ	CERS	Thu, Sep 18, 2003	5.09	5.14	5.05	5.10
1664	NASDAQ	CERS	Wed, Sep 17, 2003	5.24	5.25	5.05	5.10
1663	NASDAQ	CERS	Tue, Sep 16, 2003	5.29	5.37	5.21	5.23
1662	NASDAQ	CERS	Mon, Sep 15, 2003	5.40	5.42	5.28	5.31
1661	NASDAQ	CERS	Fri, Sep 12, 2003	5.31	5.40	5.28	5.38
1660	NASDAQ	CERS	Thu, Sep 11, 2003	5.45	5.45	5.32	5.38
1659	NASDAQ	CERS	Wed, Sep 10, 2003	5.44	5.44	5.31	5.36
1658	NASDAQ	CERS	Tue, Sep 9, 2003	5.36	5.44	5.30	5.40
1657	NASDAQ	CERS	Mon, Sep 8, 2003	5.36	5.46	5.30	5.36
1656	NASDAQ	CERS	Fri, Sep 5, 2003	5.29	5.45	5.20	5.27
1655	NASDAQ	CERS	Thu, Sep 4, 2003	7.48	7.84	4.55	5.29
1654	NASDAQ	CERS	Wed, Sep 3, 2003	7.74	7.75	7.57	7.71
1653	NASDAQ	CERS	Tue, Sep 2, 2003	7.67	7.74	7.55	7.67
1652	NASDAQ	CERS	Fri, Aug 29, 2003	7.64	7.80	7.51	7.62
1651	NASDAQ	CERS	Thu, Aug 28, 2003	7.50	7.64	7.47	7.61
1650	NASDAQ	CERS	Wed, Aug 27, 2003	7.45	7.55	7.45	7.49
1649	NASDAQ	CERS	Tue, Aug 26, 2003	7.55	7.55	7.39	7.49
1648	NASDAQ	CERS	Mon, Aug 25, 2003	7.50	7.55	7.40	7.53
1647	NASDAQ	CERS	Fri, Aug 22, 2003	7.55	7.61	7.45	7.48
1646	NASDAQ	CERS	Thu, Aug 21, 2003	7.45	7.60	7.34	7.47
1645	NASDAQ	CERS	Wed, Aug 20, 2003	7.26	7.49	7.26	7.38
1644	NASDAQ	CERS	Tue, Aug 19, 2003	7.33	7.44	7.30	7.41
1643	NASDAQ	CERS	Mon, Aug 18, 2003	7.39	7.39	7.18	7.30
1642	NASDAQ	CERS	Fri, Aug 15, 2003	7.29	7.40	7.15	7.17
1641	NASDAQ	CERS	Thu, Aug 14, 2003	7.12	7.27	7.12	7.25
1640	NASDAQ	CERS	Wed, Aug 13, 2003	7.26	7.36	7.05	7.25
1639	NASDAQ	CERS	Tue, Aug 12, 2003	6.95	7.20	6.95	7.20
1638	NASDAQ	CERS	Mon, Aug 11, 2003	6.91	7.14	6.90	7.02
1637	NASDAQ	CERS	Fri, Aug 8, 2003	6.76	7.00	6.66	6.90
1636	NASDAQ	CERS	Thu, Aug 7, 2003	6.85	6.91	6.61	6.66
1635	NASDAQ	CERS	Wed, Aug 6, 2003	7.06	7.06	6.73	6.80
1634	NASDAQ	CERS	Tue, Aug 5, 2003	7.04	7.28	6.80	6.91
1633	NASDAQ	CERS	Mon, Aug 4, 2003	7.15	7.42	7.05	7.14
1632	NASDAQ	CERS	Fri, Aug 1, 2003	7.40	7.42	7.17	7.19
1631	NASDAQ	CERS	Thu, Jul 31, 2003	7.50	7.64	7.35	7.49
1630	NASDAQ	CERS	Wed, Jul 30, 2003	7.35	7.55	7.35	7.48
1629	NASDAQ	CERS	Tue, Jul 29, 2003	7.60	7.60	7.30	7.41
1628	NASDAQ	CERS	Mon, Jul 28, 2003	7.30	7.59	7.30	7.46
1627	NASDAQ	CERS	Fri, Jul 25, 2003	7.34	7.60	7.30	7.37
1626	NASDAQ	CERS	Thu, Jul 24, 2003	7.58	7.75	7.10	7.34
1625	NASDAQ	CERS	Wed, Jul 23, 2003	7.58	8.23	7.20	7.58
1624	NASDAQ	CERS	Tue, Jul 22, 2003	7.24	7.50	7.05	7.28
1623	NASDAQ	CERS	Mon, Jul 21, 2003	7.55	7.60	7.20	7.24
1622	NASDAQ	CERS	Fri, Jul 18, 2003	7.42	7.90	7.30	7.47
1621	NASDAQ	CERS	Thu, Jul 17, 2003	7.45	7.50	7.24	7.26
1620	NASDAQ	CERS	Wed, Jul 16, 2003	7.68	7.82	7.45	7.47
1619	NASDAQ	CERS	Tue, Jul 15, 2003	7.59	8.00	7.55	7.68
1618	NASDAQ	CERS	Mon, Jul 14, 2003	7.52	7.64	7.37	7.52
1617	NASDAQ	CERS	Fri, Jul 11, 2003	7.65	7.67	7.36	7.41
1616	NASDAQ	CERS	Thu, Jul 10, 2003	7.79	7.89	7.55	7.58
1615	NASDAQ	CERS	Wed, Jul 9, 2003	7.99	8.00	7.62	7.79
1614	NASDAQ	CERS	Tue, Jul 8, 2003	7.63	8.00	7.51	7.91
1613	NASDAQ	CERS	Mon, Jul 7, 2003	7.52	7.80	7.52	7.60
1612	NASDAQ	CERS	Thu, Jul 3, 2003	8.00	8.00	7.52	7.55
1611	NASDAQ	CERS	Wed, Jul 2, 2003	7.85	8.00	7.62	7.85
1610	NASDAQ	CERS	Tue, Jul 1, 2003	7.70	7.90	7.46	7.86
1609	NASDAQ	CERS	Mon, Jun 30, 2003	7.65	7.83	7.50	7.52
1608	NASDAQ	CERS	Fri, Jun 27, 2003	7.50	7.81	7.50	7.70
1607	NASDAQ	CERS	Thu, Jun 26, 2003	7.63	7.79	7.46	7.59
1606	NASDAQ	CERS	Wed, Jun 25, 2003	7.60	7.89	7.51	7.61
1605	NASDAQ	CERS	Tue, Jun 24, 2003	7.49	7.89	7.34	7.56
1604	NASDAQ	CERS	Mon, Jun 23, 2003	7.72	7.77	7.33	7.34
1603	NASDAQ	CERS	Fri, Jun 20, 2003	7.41	7.71	7.26	7.69
1602	NASDAQ	CERS	Thu, Jun 19, 2003	7.64	7.81	7.23	7.31
1601	NASDAQ	CERS	Wed, Jun 18, 2003	7.97	8.20	7.63	7.73
1600	NASDAQ	CERS	Tue, Jun 17, 2003	8.14	8.48	7.88	7.90
1599	NASDAQ	CERS	Mon, Jun 16, 2003	8.38	8.50	7.65	8.13
1598	NASDAQ	CERS	Fri, Jun 13, 2003	9.08	9.13	8.35	8.40
1597	NASDAQ	CERS	Thu, Jun 12, 2003	9.65	9.65	9.06	9.14
1596	NASDAQ	CERS	Wed, Jun 11, 2003	9.19	9.55	9.12	9.40
1595	NASDAQ	CERS	Tue, Jun 10, 2003	9.14	9.25	9.00	9.14
1594	NASDAQ	CERS	Mon, Jun 9, 2003	9.27	9.30	8.95	9.05
1593	NASDAQ	CERS	Fri, Jun 6, 2003	9.76	9.85	8.65	9.30
1592	NASDAQ	CERS	Thu, Jun 5, 2003	10.32	10.85	9.82	10.70
1591	NASDAQ	CERS	Wed, Jun 4, 2003	11.50	11.50	11.30	11.36
1590	NASDAQ	CERS	Tue, Jun 3, 2003	11.40	11.67	11.10	11.49
1589	NASDAQ	CERS	Mon, Jun 2, 2003	11.47	12.18	11.30	11.51
1588	NASDAQ	CERS	Fri, May 30, 2003	12.04	12.18	11.12	11.29
1587	NASDAQ	CERS	Thu, May 29, 2003	12.00	13.20	11.82	12.05
1586	NASDAQ	CERS	Wed, May 28, 2003	9.90	11.97	9.84	11.79
1585	NASDAQ	CERS	Tue, May 27, 2003	9.33	10.00	9.18	9.65
1584	NASDAQ	CERS	Fri, May 23, 2003	9.10	9.34	9.00	9.28
1583	NASDAQ	CERS	Thu, May 22, 2003	9.08	9.24	8.95	8.99
1582	NASDAQ	CERS	Wed, May 21, 2003	9.01	9.20	9.00	9.08
1581	NASDAQ	CERS	Tue, May 20, 2003	8.97	9.15	8.95	9.01
1580	NASDAQ	CERS	Mon, May 19, 2003	9.55	9.59	8.95	8.95
1579	NASDAQ	CERS	Fri, May 16, 2003	9.22	9.70	9.21	9.33
1578	NASDAQ	CERS	Thu, May 15, 2003	9.11	9.57	9.11	9.50
1577	NASDAQ	CERS	Wed, May 14, 2003	8.57	9.35	8.57	9.22
1576	NASDAQ	CERS	Tue, May 13, 2003	8.69	8.75	8.57	8.61
1575	NASDAQ	CERS	Mon, May 12, 2003	8.78	8.78	8.55	8.60
1574	NASDAQ	CERS	Fri, May 9, 2003	8.45	8.76	8.45	8.73
1573	NASDAQ	CERS	Thu, May 8, 2003	8.21	8.73	8.05	8.46
1572	NASDAQ	CERS	Wed, May 7, 2003	8.05	8.27	7.90	8.21
1571	NASDAQ	CERS	Tue, May 6, 2003	8.03	8.16	7.95	7.95
1570	NASDAQ	CERS	Mon, May 5, 2003	7.99	8.25	7.96	8.16
1569	NASDAQ	CERS	Fri, May 2, 2003	7.90	8.10	7.90	8.03
1568	NASDAQ	CERS	Thu, May 1, 2003	8.04	8.14	7.61	8.08
1567	NASDAQ	CERS	Wed, Apr 30, 2003	8.11	8.17	7.86	8.10
1566	NASDAQ	CERS	Tue, Apr 29, 2003	8.52	8.53	7.98	8.24
1565	NASDAQ	CERS	Mon, Apr 28, 2003	8.40	8.69	8.40	8.69
1564	NASDAQ	CERS	Fri, Apr 25, 2003	8.75	8.75	8.39	8.40
1563	NASDAQ	CERS	Thu, Apr 24, 2003	8.70	8.78	8.65	8.73
1562	NASDAQ	CERS	Wed, Apr 23, 2003	8.90	9.00	8.67	8.75
1561	NASDAQ	CERS	Tue, Apr 22, 2003	8.55	8.97	8.50	8.94
1560	NASDAQ	CERS	Mon, Apr 21, 2003	8.61	8.65	8.42	8.54
1559	NASDAQ	CERS	Thu, Apr 17, 2003	8.27	8.55	8.21	8.50
1558	NASDAQ	CERS	Wed, Apr 16, 2003	8.83	8.83	7.75	8.06
1557	NASDAQ	CERS	Tue, Apr 15, 2003	8.59	8.75	8.42	8.75
1556	NASDAQ	CERS	Mon, Apr 14, 2003	8.27	8.83	8.21	8.54
1555	NASDAQ	CERS	Fri, Apr 11, 2003	8.35	8.70	8.35	8.44
1554	NASDAQ	CERS	Thu, Apr 10, 2003	8.45	8.57	8.03	8.34
1553	NASDAQ	CERS	Wed, Apr 9, 2003	8.72	8.91	8.43	8.53
1552	NASDAQ	CERS	Tue, Apr 8, 2003	8.53	8.77	8.42	8.75
1551	NASDAQ	CERS	Mon, Apr 7, 2003	8.63	8.95	8.42	8.42
1550	NASDAQ	CERS	Fri, Apr 4, 2003	8.92	8.92	8.49	8.50
1549	NASDAQ	CERS	Thu, Apr 3, 2003	9.05	9.24	8.81	8.88
1548	NASDAQ	CERS	Wed, Apr 2, 2003	8.70	9.30	8.70	8.94
1547	NASDAQ	CERS	Tue, Apr 1, 2003	9.04	9.15	8.35	8.61
1546	NASDAQ	CERS	Mon, Mar 31, 2003	8.35	9.85	8.26	8.80
1545	NASDAQ	CERS	Fri, Mar 28, 2003	8.12	8.36	8.04	8.15
1544	NASDAQ	CERS	Thu, Mar 27, 2003	8.07	8.15	7.90	8.09
1543	NASDAQ	CERS	Wed, Mar 26, 2003	8.53	8.59	7.90	8.09
1542	NASDAQ	CERS	Tue, Mar 25, 2003	8.19	8.75	8.00	8.35
1541	NASDAQ	CERS	Mon, Mar 24, 2003	8.49	8.50	8.02	8.41
1540	NASDAQ	CERS	Fri, Mar 21, 2003	8.07	8.36	7.93	8.15
1539	NASDAQ	CERS	Thu, Mar 20, 2003	7.35	8.06	7.11	7.88
1538	NASDAQ	CERS	Wed, Mar 19, 2003	7.04	7.68	7.00	7.41
1537	NASDAQ	CERS	Tue, Mar 18, 2003	6.75	7.09	6.74	7.00
1536	NASDAQ	CERS	Mon, Mar 17, 2003	6.39	7.00	6.31	6.92
1535	NASDAQ	CERS	Fri, Mar 14, 2003	6.17	6.31	6.07	6.19
1534	NASDAQ	CERS	Thu, Mar 13, 2003	5.91	6.19	5.91	6.17
1533	NASDAQ	CERS	Wed, Mar 12, 2003	5.85	5.96	5.79	5.83
1532	NASDAQ	CERS	Tue, Mar 11, 2003	5.70	6.00	5.62	5.85
1531	NASDAQ	CERS	Mon, Mar 10, 2003	5.50	5.70	5.29	5.66
1530	NASDAQ	CERS	Fri, Mar 7, 2003	5.68	5.75	5.53	5.59
1529	NASDAQ	CERS	Thu, Mar 6, 2003	6.43	6.43	5.85	5.93
1528	NASDAQ	CERS	Wed, Mar 5, 2003	6.54	6.58	6.38	6.40
1527	NASDAQ	CERS	Tue, Mar 4, 2003	7.20	7.20	6.55	6.66
1526	NASDAQ	CERS	Mon, Mar 3, 2003	6.84	6.96	6.74	6.79
1525	NASDAQ	CERS	Fri, Feb 28, 2003	6.94	6.95	6.70	6.75
1524	NASDAQ	CERS	Thu, Feb 27, 2003	6.99	7.14	6.92	6.92
1523	NASDAQ	CERS	Wed, Feb 26, 2003	7.53	7.98	6.94	6.98
1522	NASDAQ	CERS	Tue, Feb 25, 2003	6.75	6.98	6.45	6.80
1521	NASDAQ	CERS	Mon, Feb 24, 2003	6.84	6.88	6.64	6.66
1520	NASDAQ	CERS	Fri, Feb 21, 2003	6.79	6.89	6.69	6.84
1519	NASDAQ	CERS	Thu, Feb 20, 2003	6.77	6.89	6.67	6.70
1518	NASDAQ	CERS	Wed, Feb 19, 2003	6.80	6.94	6.56	6.69
1517	NASDAQ	CERS	Tue, Feb 18, 2003	7.00	7.03	6.61	6.82
1516	NASDAQ	CERS	Fri, Feb 14, 2003	7.10	7.20	6.85	6.99
1515	NASDAQ	CERS	Thu, Feb 13, 2003	7.03	7.37	6.94	7.13
1514	NASDAQ	CERS	Wed, Feb 12, 2003	7.03	7.17	6.98	7.01
1513	NASDAQ	CERS	Tue, Feb 11, 2003	7.15	7.34	7.00	7.02
1512	NASDAQ	CERS	Mon, Feb 10, 2003	7.06	7.30	6.91	7.21
1511	NASDAQ	CERS	Fri, Feb 7, 2003	7.12	7.33	6.85	7.04
1510	NASDAQ	CERS	Thu, Feb 6, 2003	7.00	7.44	6.97	7.04
1509	NASDAQ	CERS	Wed, Feb 5, 2003	7.25	7.45	7.02	7.09
1508	NASDAQ	CERS	Tue, Feb 4, 2003	7.85	7.93	6.82	7.24
1507	NASDAQ	CERS	Mon, Feb 3, 2003	8.89	8.89	7.83	7.90
1506	NASDAQ	CERS	Fri, Jan 31, 2003	9.28	9.51	8.10	8.36
1505	NASDAQ	CERS	Thu, Jan 30, 2003	14.45	15.64	14.31	14.32
1504	NASDAQ	CERS	Wed, Jan 29, 2003	13.75	14.90	13.49	14.40
1503	NASDAQ	CERS	Tue, Jan 28, 2003	13.39	14.15	13.23	13.87
1502	NASDAQ	CERS	Mon, Jan 27, 2003	13.95	14.08	13.34	13.39
1501	NASDAQ	CERS	Fri, Jan 24, 2003	14.50	14.58	14.04	14.15
1500	NASDAQ	CERS	Thu, Jan 23, 2003	14.60	14.79	14.44	14.76
1499	NASDAQ	CERS	Wed, Jan 22, 2003	14.87	14.93	14.50	14.54
1498	NASDAQ	CERS	Tue, Jan 21, 2003	15.51	15.54	14.86	14.93
1497	NASDAQ	CERS	Fri, Jan 17, 2003	15.87	16.14	15.48	15.54
1496	NASDAQ	CERS	Thu, Jan 16, 2003	16.05	16.60	15.85	15.90
1495	NASDAQ	CERS	Wed, Jan 15, 2003	16.29	16.69	15.56	15.88
1494	NASDAQ	CERS	Tue, Jan 14, 2003	16.61	16.95	16.12	16.60
1493	NASDAQ	CERS	Mon, Jan 13, 2003	18.02	18.19	16.66	16.81
1492	NASDAQ	CERS	Fri, Jan 10, 2003	18.09	18.38	17.80	18.02
1491	NASDAQ	CERS	Thu, Jan 9, 2003	18.36	18.74	18.04	18.30
1490	NASDAQ	CERS	Wed, Jan 8, 2003	19.79	19.84	18.22	18.60
1489	NASDAQ	CERS	Tue, Jan 7, 2003	20.88	21.19	19.79	19.88
1488	NASDAQ	CERS	Mon, Jan 6, 2003	21.15	21.44	20.71	21.09
1487	NASDAQ	CERS	Fri, Jan 3, 2003	21.70	21.70	21.10	21.20
1486	NASDAQ	CERS	Thu, Jan 2, 2003	21.36	21.75	20.59	21.72
1485	NASDAQ	CERS	Tue, Dec 31, 2002	21.08	22.06	21.07	21.50
1484	NASDAQ	CERS	Mon, Dec 30, 2002	21.25	21.83	20.76	21.06
1483	NASDAQ	CERS	Fri, Dec 27, 2002	22.08	22.08	21.12	21.44
1482	NASDAQ	CERS	Thu, Dec 26, 2002	22.25	22.53	21.86	22.11
1481	NASDAQ	CERS	Tue, Dec 24, 2002	22.17	22.45	22.16	22.26
1480	NASDAQ	CERS	Mon, Dec 23, 2002	21.94	22.30	21.60	22.07
1479	NASDAQ	CERS	Fri, Dec 20, 2002	22.15	22.35	21.50	21.99
1478	NASDAQ	CERS	Thu, Dec 19, 2002	21.30	22.20	21.30	21.92
1477	NASDAQ	CERS	Wed, Dec 18, 2002	21.46	21.46	20.96	21.06
1476	NASDAQ	CERS	Tue, Dec 17, 2002	21.42	21.84	21.30	21.62
1475	NASDAQ	CERS	Mon, Dec 16, 2002	21.03	21.41	20.89	21.41
1474	NASDAQ	CERS	Fri, Dec 13, 2002	21.95	21.95	21.20	21.35
1473	NASDAQ	CERS	Thu, Dec 12, 2002	22.05	22.46	21.56	21.87
1472	NASDAQ	CERS	Wed, Dec 11, 2002	21.99	22.57	21.89	22.22
1471	NASDAQ	CERS	Tue, Dec 10, 2002	22.20	22.42	21.89	22.03
1470	NASDAQ	CERS	Mon, Dec 9, 2002	23.53	23.53	22.08	22.08
1469	NASDAQ	CERS	Fri, Dec 6, 2002	22.32	23.40	22.32	23.37
1468	NASDAQ	CERS	Thu, Dec 5, 2002	23.59	23.59	22.00	22.71
1467	NASDAQ	CERS	Wed, Dec 4, 2002	23.75	23.75	23.15	23.40
1466	NASDAQ	CERS	Tue, Dec 3, 2002	24.20	24.40	23.60	24.02
1465	NASDAQ	CERS	Mon, Dec 2, 2002	24.75	25.00	24.25	24.48
1464	NASDAQ	CERS	Fri, Nov 29, 2002	24.30	24.78	24.00	24.36
1463	NASDAQ	CERS	Wed, Nov 27, 2002	23.03	24.31	22.54	24.15
1462	NASDAQ	CERS	Tue, Nov 26, 2002	23.46	23.46	22.82	23.16
1461	NASDAQ	CERS	Mon, Nov 25, 2002	22.60	23.48	22.00	23.26
1460	NASDAQ	CERS	Fri, Nov 22, 2002	20.39	22.59	20.38	22.34
1459	NASDAQ	CERS	Thu, Nov 21, 2002	20.36	20.59	20.01	20.50
1458	NASDAQ	CERS	Wed, Nov 20, 2002	18.40	20.32	18.40	20.25
1457	NASDAQ	CERS	Tue, Nov 19, 2002	18.55	18.80	18.31	18.56
1456	NASDAQ	CERS	Mon, Nov 18, 2002	18.20	18.98	18.20	18.57
1455	NASDAQ	CERS	Fri, Nov 15, 2002	18.00	18.21	17.93	18.15
1454	NASDAQ	CERS	Thu, Nov 14, 2002	17.80	18.11	17.68	17.88
1453	NASDAQ	CERS	Wed, Nov 13, 2002	17.50	18.10	17.26	17.67
1452	NASDAQ	CERS	Tue, Nov 12, 2002	17.40	18.00	17.40	17.66
1451	NASDAQ	CERS	Mon, Nov 11, 2002	18.00	18.00	17.36	17.43
1450	NASDAQ	CERS	Fri, Nov 8, 2002	18.75	18.75	17.77	18.15
1449	NASDAQ	CERS	Thu, Nov 7, 2002	18.90	18.90	18.46	18.50
1448	NASDAQ	CERS	Wed, Nov 6, 2002	18.48	19.09	18.28	18.84
1447	NASDAQ	CERS	Tue, Nov 5, 2002	18.47	18.63	18.01	18.22
1446	NASDAQ	CERS	Mon, Nov 4, 2002	18.65	18.80	17.88	18.28
1445	NASDAQ	CERS	Fri, Nov 1, 2002	17.66	18.49	16.29	18.36
1444	NASDAQ	CERS	Thu, Oct 31, 2002	18.28	19.32	17.82	17.82
1443	NASDAQ	CERS	Wed, Oct 30, 2002	18.50	18.87	17.93	18.28
1442	NASDAQ	CERS	Tue, Oct 29, 2002	19.69	19.89	18.42	18.75
1441	NASDAQ	CERS	Mon, Oct 28, 2002	19.90	20.29	19.46	19.81
1440	NASDAQ	CERS	Fri, Oct 25, 2002	19.60	20.20	19.31	19.86
1439	NASDAQ	CERS	Thu, Oct 24, 2002	19.57	20.50	19.31	19.46
1438	NASDAQ	CERS	Wed, Oct 23, 2002	16.55	19.95	16.51	19.57
1437	NASDAQ	CERS	Tue, Oct 22, 2002	16.61	17.29	16.11	16.54
1436	NASDAQ	CERS	Mon, Oct 21, 2002	14.89	16.60	14.51	15.94
1435	NASDAQ	CERS	Fri, Oct 18, 2002	14.25	15.08	14.19	14.78
1434	NASDAQ	CERS	Thu, Oct 17, 2002	14.44	15.50	14.07	14.28
1433	NASDAQ	CERS	Wed, Oct 16, 2002	14.40	14.55	13.86	13.99
1432	NASDAQ	CERS	Tue, Oct 15, 2002	13.70	14.41	13.47	14.00
1431	NASDAQ	CERS	Mon, Oct 14, 2002	12.94	13.46	12.85	13.13
1430	NASDAQ	CERS	Fri, Oct 11, 2002	12.75	13.40	12.44	12.93
1429	NASDAQ	CERS	Thu, Oct 10, 2002	11.94	13.30	11.38	12.25
1428	NASDAQ	CERS	Wed, Oct 9, 2002	13.80	14.14	11.85	11.87
1427	NASDAQ	CERS	Tue, Oct 8, 2002	14.00	14.25	13.57	13.95
1426	NASDAQ	CERS	Mon, Oct 7, 2002	13.76	14.24	13.60	14.01
1425	NASDAQ	CERS	Fri, Oct 4, 2002	14.99	14.99	13.50	14.00
1424	NASDAQ	CERS	Thu, Oct 3, 2002	15.45	15.53	14.17	14.99
1423	NASDAQ	CERS	Wed, Oct 2, 2002	16.15	16.95	15.32	15.32
1422	NASDAQ	CERS	Tue, Oct 1, 2002	16.82	17.49	16.14	16.14
1421	NASDAQ	CERS	Mon, Sep 30, 2002	15.91	16.87	14.79	16.67
1420	NASDAQ	CERS	Fri, Sep 27, 2002	16.45	16.91	15.72	16.10
1419	NASDAQ	CERS	Thu, Sep 26, 2002	17.18	17.63	16.06	16.54
1418	NASDAQ	CERS	Wed, Sep 25, 2002	16.35	17.12	15.73	17.02
1417	NASDAQ	CERS	Tue, Sep 24, 2002	15.66	16.30	15.51	16.29
1416	NASDAQ	CERS	Mon, Sep 23, 2002	16.85	16.85	16.03	16.40
1415	NASDAQ	CERS	Fri, Sep 20, 2002	17.20	17.72	16.34	17.25
1414	NASDAQ	CERS	Thu, Sep 19, 2002	17.09	17.40	16.61	16.70
1413	NASDAQ	CERS	Wed, Sep 18, 2002	17.27	17.91	17.09	17.33
1412	NASDAQ	CERS	Tue, Sep 17, 2002	18.27	18.98	17.26	17.38
1411	NASDAQ	CERS	Mon, Sep 16, 2002	17.70	17.90	17.48	17.55
1410	NASDAQ	CERS	Fri, Sep 13, 2002	16.85	18.09	16.84	17.90
1409	NASDAQ	CERS	Thu, Sep 12, 2002	17.60	17.93	17.23	17.67
1408	NASDAQ	CERS	Wed, Sep 11, 2002	17.55	19.19	17.42	17.99
1407	NASDAQ	CERS	Tue, Sep 10, 2002	16.80	17.58	16.45	17.23
1406	NASDAQ	CERS	Mon, Sep 9, 2002	16.53	16.98	15.71	16.95
1405	NASDAQ	CERS	Fri, Sep 6, 2002	16.75	17.28	16.55	17.03
1404	NASDAQ	CERS	Thu, Sep 5, 2002	16.70	16.75	15.57	16.27
1403	NASDAQ	CERS	Wed, Sep 4, 2002	16.35	17.75	16.05	17.24
1402	NASDAQ	CERS	Tue, Sep 3, 2002	17.25	17.25	16.05	16.80
1401	NASDAQ	CERS	Fri, Aug 30, 2002	18.43	18.43	17.35	17.35
1400	NASDAQ	CERS	Thu, Aug 29, 2002	18.31	18.91	18.00	18.44
1399	NASDAQ	CERS	Wed, Aug 28, 2002	19.52	19.52	18.55	18.55
1398	NASDAQ	CERS	Tue, Aug 27, 2002	20.29	20.30	18.85	19.00
1397	NASDAQ	CERS	Mon, Aug 26, 2002	20.60	20.64	19.45	20.53
1396	NASDAQ	CERS	Fri, Aug 23, 2002	20.72	22.09	20.06	20.47
1395	NASDAQ	CERS	Thu, Aug 22, 2002	19.35	21.99	19.32	21.65
1394	NASDAQ	CERS	Wed, Aug 21, 2002	20.07	20.07	18.99	19.79
1393	NASDAQ	CERS	Tue, Aug 20, 2002	19.32	19.93	18.84	19.26
1392	NASDAQ	CERS	Mon, Aug 19, 2002	19.51	19.75	18.50	18.99
1391	NASDAQ	CERS	Fri, Aug 16, 2002	18.80	19.76	18.06	19.50
1390	NASDAQ	CERS	Thu, Aug 15, 2002	17.90	19.30	17.50	18.20
1389	NASDAQ	CERS	Wed, Aug 14, 2002	17.66	18.25	17.10	17.30
1388	NASDAQ	CERS	Tue, Aug 13, 2002	20.34	20.34	16.96	17.46
1387	NASDAQ	CERS	Mon, Aug 12, 2002	19.80	20.31	19.80	20.06
1386	NASDAQ	CERS	Fri, Aug 9, 2002	20.00	20.81	19.83	20.45
1385	NASDAQ	CERS	Thu, Aug 8, 2002	20.45	20.68	19.46	19.95
1384	NASDAQ	CERS	Wed, Aug 7, 2002	21.45	21.80	19.36	20.09
1383	NASDAQ	CERS	Tue, Aug 6, 2002	20.51	21.29	20.12	21.00
1382	NASDAQ	CERS	Mon, Aug 5, 2002	22.70	23.25	19.88	20.38
1381	NASDAQ	CERS	Fri, Aug 2, 2002	24.54	24.84	23.15	23.25
1380	NASDAQ	CERS	Thu, Aug 1, 2002	27.00	27.25	24.25	24.56
1379	NASDAQ	CERS	Wed, Jul 31, 2002	27.80	30.38	27.80	28.55
1378	NASDAQ	CERS	Tue, Jul 30, 2002	26.38	28.19	25.38	27.79
1377	NASDAQ	CERS	Mon, Jul 29, 2002	26.30	26.48	24.51	26.30
1376	NASDAQ	CERS	Fri, Jul 26, 2002	27.50	27.50	25.14	25.22
1375	NASDAQ	CERS	Thu, Jul 25, 2002	26.55	28.65	26.48	26.96
1374	NASDAQ	CERS	Wed, Jul 24, 2002	24.09	27.28	23.12	26.55
1373	NASDAQ	CERS	Tue, Jul 23, 2002	26.66	26.75	23.94	23.94
1372	NASDAQ	CERS	Mon, Jul 22, 2002	26.26	26.93	26.00	26.67
1371	NASDAQ	CERS	Fri, Jul 19, 2002	27.51	27.80	26.31	26.95
1370	NASDAQ	CERS	Thu, Jul 18, 2002	29.96	29.97	27.01	28.05
1369	NASDAQ	CERS	Wed, Jul 17, 2002	29.96	30.32	29.05	29.85
1368	NASDAQ	CERS	Tue, Jul 16, 2002	26.71	30.60	26.50	29.33
1367	NASDAQ	CERS	Mon, Jul 15, 2002	26.88	26.89	24.66	26.80
1366	NASDAQ	CERS	Fri, Jul 12, 2002	26.87	28.00	25.91	26.85
1365	NASDAQ	CERS	Thu, Jul 11, 2002	24.70	27.56	23.65	27.01
1364	NASDAQ	CERS	Wed, Jul 10, 2002	27.59	27.71	24.76	25.34
1363	NASDAQ	CERS	Tue, Jul 9, 2002	29.70	30.41	27.01	28.01
1362	NASDAQ	CERS	Mon, Jul 8, 2002	28.76	30.48	27.46	29.29
1361	NASDAQ	CERS	Fri, Jul 5, 2002	28.27	30.02	28.24	28.82
1360	NASDAQ	CERS	Wed, Jul 3, 2002	30.07	30.07	27.50	28.35
1359	NASDAQ	CERS	Tue, Jul 2, 2002	32.41	32.41	30.10	30.36
1358	NASDAQ	CERS	Mon, Jul 1, 2002	33.87	33.88	32.10	32.62
1357	NASDAQ	CERS	Fri, Jun 28, 2002	32.76	34.37	32.04	33.88
1356	NASDAQ	CERS	Thu, Jun 27, 2002	31.89	32.74	31.85	32.47
1355	NASDAQ	CERS	Wed, Jun 26, 2002	30.89	32.18	29.79	32.18
1354	NASDAQ	CERS	Tue, Jun 25, 2002	32.16	32.92	31.50	31.68
1353	NASDAQ	CERS	Mon, Jun 24, 2002	32.68	33.58	31.95	32.87
1352	NASDAQ	CERS	Fri, Jun 21, 2002	34.28	34.67	33.03	33.18
1351	NASDAQ	CERS	Thu, Jun 20, 2002	35.55	35.76	34.20	34.20
1350	NASDAQ	CERS	Wed, Jun 19, 2002	35.09	36.66	35.09	35.62
1349	NASDAQ	CERS	Tue, Jun 18, 2002	35.70	37.10	35.07	35.69
1348	NASDAQ	CERS	Mon, Jun 17, 2002	32.94	36.44	32.44	35.87
1347	NASDAQ	CERS	Fri, Jun 14, 2002	31.09	32.88	30.60	32.88
1346	NASDAQ	CERS	Thu, Jun 13, 2002	33.49	33.49	31.34	32.08
1345	NASDAQ	CERS	Wed, Jun 12, 2002	32.66	33.44	30.28	33.43
1344	NASDAQ	CERS	Tue, Jun 11, 2002	33.97	35.25	31.66	32.35
1343	NASDAQ	CERS	Mon, Jun 10, 2002	34.55	36.00	34.22	34.85
1342	NASDAQ	CERS	Fri, Jun 7, 2002	32.60	35.99	31.29	35.78
1341	NASDAQ	CERS	Thu, Jun 6, 2002	36.56	36.70	33.10	33.60
1340	NASDAQ	CERS	Wed, Jun 5, 2002	38.02	38.60	36.50	37.02
1339	NASDAQ	CERS	Tue, Jun 4, 2002	43.24	43.63	36.76	38.99
1338	NASDAQ	CERS	Mon, Jun 3, 2002	42.37	43.66	41.00	41.00
1337	NASDAQ	CERS	Fri, May 31, 2002	41.60	43.92	41.60	43.23
1336	NASDAQ	CERS	Thu, May 30, 2002	41.72	42.40	41.20	42.40
1335	NASDAQ	CERS	Wed, May 29, 2002	43.33	43.33	42.11	42.49
1334	NASDAQ	CERS	Tue, May 28, 2002	44.95	45.00	41.54	43.47
1333	NASDAQ	CERS	Fri, May 24, 2002	44.75	45.74	44.40	44.40
1332	NASDAQ	CERS	Thu, May 23, 2002	44.29	45.69	44.28	45.57
1331	NASDAQ	CERS	Wed, May 22, 2002	45.66	45.93	44.03	44.84
1330	NASDAQ	CERS	Tue, May 21, 2002	46.01	46.01	45.58	45.80
1329	NASDAQ	CERS	Mon, May 20, 2002	46.97	46.97	45.02	46.18
1328	NASDAQ	CERS	Fri, May 17, 2002	46.89	47.25	46.31	46.98
1327	NASDAQ	CERS	Thu, May 16, 2002	47.85	47.85	45.07	46.40
1326	NASDAQ	CERS	Wed, May 15, 2002	47.35	49.69	46.22	47.51
1325	NASDAQ	CERS	Tue, May 14, 2002	46.00	47.75	46.00	46.74
1324	NASDAQ	CERS	Mon, May 13, 2002	46.45	47.50	45.52	45.99
1323	NASDAQ	CERS	Fri, May 10, 2002	48.21	48.24	44.17	46.50
1322	NASDAQ	CERS	Thu, May 9, 2002	48.13	48.61	47.70	48.20
1321	NASDAQ	CERS	Wed, May 8, 2002	47.37	49.48	47.36	48.14
1320	NASDAQ	CERS	Tue, May 7, 2002	47.38	48.30	46.90	47.35
1319	NASDAQ	CERS	Mon, May 6, 2002	49.00	49.44	47.29	47.36
1318	NASDAQ	CERS	Fri, May 3, 2002	49.00	49.98	48.95	49.00
1317	NASDAQ	CERS	Thu, May 2, 2002	49.93	50.40	49.02	49.07
1316	NASDAQ	CERS	Wed, May 1, 2002	51.10	51.35	49.61	49.90
1315	NASDAQ	CERS	Tue, Apr 30, 2002	51.87	51.87	50.00	51.21
1314	NASDAQ	CERS	Mon, Apr 29, 2002	51.69	52.55	51.22	51.98
1313	NASDAQ	CERS	Fri, Apr 26, 2002	49.82	51.23	48.76	50.90
1312	NASDAQ	CERS	Thu, Apr 25, 2002	51.16	51.62	49.58	50.00
1311	NASDAQ	CERS	Wed, Apr 24, 2002	51.78	52.10	51.23	51.56
1310	NASDAQ	CERS	Tue, Apr 23, 2002	52.88	53.23	51.70	51.85
1309	NASDAQ	CERS	Mon, Apr 22, 2002	54.18	54.18	52.76	53.00
1308	NASDAQ	CERS	Fri, Apr 19, 2002	55.96	56.20	54.20	54.29
1307	NASDAQ	CERS	Thu, Apr 18, 2002	54.68	56.64	54.25	55.66
1306	NASDAQ	CERS	Wed, Apr 17, 2002	54.26	55.06	54.25	54.31
1305	NASDAQ	CERS	Tue, Apr 16, 2002	55.07	55.07	54.36	54.40
1304	NASDAQ	CERS	Mon, Apr 15, 2002	53.54	55.12	52.90	54.30
1303	NASDAQ	CERS	Fri, Apr 12, 2002	54.22	54.26	52.76	53.34
1302	NASDAQ	CERS	Thu, Apr 11, 2002	55.19	55.21	53.96	54.20
1301	NASDAQ	CERS	Wed, Apr 10, 2002	54.15	55.72	54.10	54.56
1300	NASDAQ	CERS	Tue, Apr 9, 2002	54.00	54.48	53.35	54.30
1299	NASDAQ	CERS	Mon, Apr 8, 2002	54.59	55.00	53.33	53.94
1298	NASDAQ	CERS	Fri, Apr 5, 2002	56.31	56.50	55.28	55.87
1297	NASDAQ	CERS	Thu, Apr 4, 2002	57.07	57.35	56.20	56.64
1296	NASDAQ	CERS	Wed, Apr 3, 2002	58.99	59.69	57.14	57.28
1295	NASDAQ	CERS	Tue, Apr 2, 2002	56.39	59.01	55.70	58.68
1294	NASDAQ	CERS	Mon, Apr 1, 2002	53.10	56.38	53.10	55.95
1293	NASDAQ	CERS	Thu, Mar 28, 2002	52.32	53.99	52.00	53.57
1292	NASDAQ	CERS	Wed, Mar 27, 2002	51.94	52.44	51.22	52.19
1291	NASDAQ	CERS	Tue, Mar 26, 2002	51.25	52.70	51.12	51.78
1290	NASDAQ	CERS	Mon, Mar 25, 2002	50.60	50.60	50.00	50.34
1289	NASDAQ	CERS	Fri, Mar 22, 2002	50.20	50.62	49.90	50.05
1288	NASDAQ	CERS	Thu, Mar 21, 2002	50.10	50.69	49.95	50.61
1287	NASDAQ	CERS	Wed, Mar 20, 2002	48.96	50.18	48.83	50.18
1286	NASDAQ	CERS	Tue, Mar 19, 2002	49.61	49.95	49.12	49.38
1285	NASDAQ	CERS	Mon, Mar 18, 2002	50.03	50.15	49.30	49.65
1284	NASDAQ	CERS	Fri, Mar 15, 2002	49.01	50.09	48.92	50.05
1283	NASDAQ	CERS	Thu, Mar 14, 2002	48.75	49.50	48.43	49.22
1282	NASDAQ	CERS	Wed, Mar 13, 2002	48.95	48.95	48.00	48.23
1281	NASDAQ	CERS	Tue, Mar 12, 2002	48.90	49.38	48.35	48.56
1280	NASDAQ	CERS	Mon, Mar 11, 2002	48.09	49.67	48.09	49.33
1279	NASDAQ	CERS	Fri, Mar 8, 2002	49.66	50.00	47.26	48.25
1278	NASDAQ	CERS	Thu, Mar 7, 2002	50.48	50.49	49.27	49.28
1277	NASDAQ	CERS	Wed, Mar 6, 2002	48.76	50.24	48.76	50.00
1276	NASDAQ	CERS	Tue, Mar 5, 2002	49.31	49.89	48.80	48.85
1275	NASDAQ	CERS	Mon, Mar 4, 2002	47.14	49.39	47.14	49.39
1274	NASDAQ	CERS	Fri, Mar 1, 2002	47.11	47.65	46.86	47.61
1273	NASDAQ	CERS	Thu, Feb 28, 2002	49.05	49.05	46.91	47.03
1272	NASDAQ	CERS	Wed, Feb 27, 2002	48.94	49.40	48.31	48.81
1271	NASDAQ	CERS	Tue, Feb 26, 2002	47.60	48.70	46.89	48.58
1270	NASDAQ	CERS	Mon, Feb 25, 2002	46.53	47.54	45.70	47.54
1269	NASDAQ	CERS	Fri, Feb 22, 2002	47.93	47.93	45.78	47.10
1268	NASDAQ	CERS	Thu, Feb 21, 2002	47.46	48.22	47.28	47.52
1267	NASDAQ	CERS	Wed, Feb 20, 2002	46.85	47.50	46.33	47.42
1266	NASDAQ	CERS	Tue, Feb 19, 2002	47.78	47.78	46.80	46.80
1265	NASDAQ	CERS	Fri, Feb 15, 2002	47.68	48.30	46.81	47.92
1264	NASDAQ	CERS	Thu, Feb 14, 2002	48.70	48.70	47.65	47.70
1263	NASDAQ	CERS	Wed, Feb 13, 2002	48.41	49.20	48.17	48.56
1262	NASDAQ	CERS	Tue, Feb 12, 2002	47.96	48.42	47.05	48.11
1261	NASDAQ	CERS	Mon, Feb 11, 2002	46.30	47.98	45.78	47.63
1260	NASDAQ	CERS	Fri, Feb 8, 2002	43.72	46.30	43.72	46.30
1259	NASDAQ	CERS	Thu, Feb 7, 2002	44.60	45.00	43.50	44.25
1258	NASDAQ	CERS	Wed, Feb 6, 2002	46.55	46.81	44.60	44.80
1257	NASDAQ	CERS	Tue, Feb 5, 2002	47.56	47.95	46.54	46.55
1256	NASDAQ	CERS	Mon, Feb 4, 2002	50.02	50.25	47.57	47.80
1255	NASDAQ	CERS	Fri, Feb 1, 2002	50.06	50.50	49.90	50.09
1254	NASDAQ	CERS	Thu, Jan 31, 2002	50.12	50.94	49.55	50.09
1253	NASDAQ	CERS	Wed, Jan 30, 2002	50.60	50.80	49.25	50.34
1252	NASDAQ	CERS	Tue, Jan 29, 2002	52.00	52.00	49.92	50.65
1251	NASDAQ	CERS	Mon, Jan 28, 2002	51.26	52.50	50.10	51.91
1250	NASDAQ	CERS	Fri, Jan 25, 2002	50.70	51.40	49.60	51.01
1249	NASDAQ	CERS	Thu, Jan 24, 2002	47.60	49.95	47.45	49.36
1248	NASDAQ	CERS	Wed, Jan 23, 2002	47.30	47.65	47.01	47.50
1247	NASDAQ	CERS	Tue, Jan 22, 2002	47.40	47.80	47.01	47.52
1246	NASDAQ	CERS	Fri, Jan 18, 2002	48.57	48.83	47.41	47.62
1245	NASDAQ	CERS	Thu, Jan 17, 2002	48.14	48.63	47.25	48.63
1244	NASDAQ	CERS	Wed, Jan 16, 2002	47.55	48.15	47.55	47.84
1243	NASDAQ	CERS	Tue, Jan 15, 2002	49.10	49.10	47.36	48.10
1242	NASDAQ	CERS	Mon, Jan 14, 2002	48.26	48.99	48.11	48.55
1241	NASDAQ	CERS	Fri, Jan 11, 2002	48.60	49.69	48.11	48.74
1240	NASDAQ	CERS	Thu, Jan 10, 2002	47.76	48.26	47.25	47.47
1239	NASDAQ	CERS	Wed, Jan 9, 2002	48.29	48.30	47.40	47.50
1238	NASDAQ	CERS	Tue, Jan 8, 2002	46.49	48.00	46.20	47.68
1237	NASDAQ	CERS	Mon, Jan 7, 2002	48.75	49.49	46.00	46.49
1236	NASDAQ	CERS	Fri, Jan 4, 2002	49.44	52.18	48.22	48.31
1235	NASDAQ	CERS	Thu, Jan 3, 2002	47.00	48.93	46.81	48.07
1234	NASDAQ	CERS	Wed, Jan 2, 2002	46.50	47.62	46.13	46.77
1233	NASDAQ	CERS	Mon, Dec 31, 2001	47.79	47.94	45.74	45.75
1232	NASDAQ	CERS	Fri, Dec 28, 2001	47.65	49.46	46.79	47.50
1231	NASDAQ	CERS	Thu, Dec 27, 2001	48.25	48.48	47.56	47.83
1230	NASDAQ	CERS	Wed, Dec 26, 2001	48.85	48.90	47.75	48.30
1229	NASDAQ	CERS	Mon, Dec 24, 2001	47.92	48.55	47.37	48.55
1228	NASDAQ	CERS	Fri, Dec 21, 2001	48.17	48.94	47.91	48.15
1227	NASDAQ	CERS	Thu, Dec 20, 2001	47.54	48.38	47.22	48.03
1226	NASDAQ	CERS	Wed, Dec 19, 2001	49.02	49.50	47.51	47.77
1225	NASDAQ	CERS	Tue, Dec 18, 2001	49.05	50.65	49.05	49.97
1224	NASDAQ	CERS	Mon, Dec 17, 2001	48.30	50.10	47.75	49.39
1223	NASDAQ	CERS	Fri, Dec 14, 2001	47.78	48.41	47.02	48.30
1222	NASDAQ	CERS	Thu, Dec 13, 2001	46.95	48.47	46.18	48.10
1221	NASDAQ	CERS	Wed, Dec 12, 2001	51.00	51.35	45.85	46.50
1220	NASDAQ	CERS	Tue, Dec 11, 2001	47.91	51.24	47.91	50.99
1219	NASDAQ	CERS	Mon, Dec 10, 2001	46.70	48.00	45.60	47.54
1218	NASDAQ	CERS	Fri, Dec 7, 2001	45.00	46.50	44.00	45.64
1217	NASDAQ	CERS	Thu, Dec 6, 2001	42.00	45.05	41.51	44.40
1216	NASDAQ	CERS	Wed, Dec 5, 2001	40.59	42.82	40.00	41.90
1215	NASDAQ	CERS	Tue, Dec 4, 2001	42.19	42.19	39.55	39.90
1214	NASDAQ	CERS	Mon, Dec 3, 2001	42.00	42.47	41.76	42.47
1213	NASDAQ	CERS	Fri, Nov 30, 2001	43.00	43.00	42.01	42.76
1212	NASDAQ	CERS	Thu, Nov 29, 2001	43.80	43.80	42.60	42.66
1211	NASDAQ	CERS	Wed, Nov 28, 2001	44.71	44.71	43.51	44.06
1210	NASDAQ	CERS	Tue, Nov 27, 2001	43.55	44.88	43.55	43.60
1209	NASDAQ	CERS	Mon, Nov 26, 2001	44.30	44.84	43.70	44.25
1208	NASDAQ	CERS	Fri, Nov 23, 2001	44.00	44.67	43.98	44.55
1207	NASDAQ	CERS	Wed, Nov 21, 2001	45.75	45.75	44.19	44.26
1206	NASDAQ	CERS	Tue, Nov 20, 2001	46.00	46.35	44.70	45.50
1205	NASDAQ	CERS	Mon, Nov 19, 2001	44.89	45.92	44.56	45.83
1204	NASDAQ	CERS	Fri, Nov 16, 2001	45.40	45.40	44.11	44.89
1203	NASDAQ	CERS	Thu, Nov 15, 2001	45.75	45.75	44.25	44.71
1202	NASDAQ	CERS	Wed, Nov 14, 2001	46.05	46.45	44.35	45.25
1201	NASDAQ	CERS	Tue, Nov 13, 2001	44.11	46.38	44.11	45.95
1200	NASDAQ	CERS	Mon, Nov 12, 2001	45.75	45.75	43.40	44.25
1199	NASDAQ	CERS	Fri, Nov 9, 2001	46.60	47.05	45.10	45.73
1198	NASDAQ	CERS	Thu, Nov 8, 2001	46.99	47.10	46.35	46.98
1197	NASDAQ	CERS	Wed, Nov 7, 2001	46.21	47.24	46.21	46.41
1196	NASDAQ	CERS	Tue, Nov 6, 2001	47.15	47.20	46.10	47.05
1195	NASDAQ	CERS	Mon, Nov 5, 2001	47.95	47.95	46.47	46.56
1194	NASDAQ	CERS	Fri, Nov 2, 2001	45.43	47.50	45.40	47.07
1193	NASDAQ	CERS	Thu, Nov 1, 2001	46.10	46.25	44.73	45.25
1192	NASDAQ	CERS	Wed, Oct 31, 2001	47.29	48.25	45.47	45.93
1191	NASDAQ	CERS	Tue, Oct 30, 2001	47.00	48.07	46.30	47.89
1190	NASDAQ	CERS	Mon, Oct 29, 2001	48.03	48.90	48.03	48.25
1189	NASDAQ	CERS	Fri, Oct 26, 2001	48.00	48.75	47.64	48.48
1188	NASDAQ	CERS	Thu, Oct 25, 2001	46.75	48.68	46.74	48.26
1187	NASDAQ	CERS	Wed, Oct 24, 2001	47.42	49.74	46.40	48.90
1186	NASDAQ	CERS	Tue, Oct 23, 2001	53.99	57.41	53.99	54.17
1185	NASDAQ	CERS	Mon, Oct 22, 2001	51.85	54.30	51.74	53.99
1184	NASDAQ	CERS	Fri, Oct 19, 2001	51.00	52.93	50.40	52.27
1183	NASDAQ	CERS	Thu, Oct 18, 2001	50.49	50.91	48.02	50.50
1182	NASDAQ	CERS	Wed, Oct 17, 2001	53.50	53.50	49.05	49.05
1181	NASDAQ	CERS	Tue, Oct 16, 2001	51.36	53.45	51.36	52.10
1180	NASDAQ	CERS	Mon, Oct 15, 2001	50.95	52.05	50.51	51.86
1179	NASDAQ	CERS	Fri, Oct 12, 2001	49.84	52.00	49.75	52.00
1178	NASDAQ	CERS	Thu, Oct 11, 2001	47.60	52.24	47.50	51.15
1177	NASDAQ	CERS	Wed, Oct 10, 2001	44.95	47.89	44.40	47.36
1176	NASDAQ	CERS	Tue, Oct 9, 2001	43.81	45.39	43.61	44.70
1175	NASDAQ	CERS	Mon, Oct 8, 2001	45.88	46.84	43.80	43.99
1174	NASDAQ	CERS	Fri, Oct 5, 2001	46.03	47.46	44.00	46.25
1173	NASDAQ	CERS	Thu, Oct 4, 2001	47.00	47.39	45.60	46.25
1172	NASDAQ	CERS	Wed, Oct 3, 2001	45.61	47.61	45.61	46.15
1171	NASDAQ	CERS	Tue, Oct 2, 2001	45.05	47.35	45.00	46.20
1170	NASDAQ	CERS	Mon, Oct 1, 2001	49.49	50.37	45.46	45.70
1169	NASDAQ	CERS	Fri, Sep 28, 2001	45.14	48.09	44.90	47.25
1168	NASDAQ	CERS	Thu, Sep 27, 2001	45.15	45.16	41.64	45.05
1167	NASDAQ	CERS	Wed, Sep 26, 2001	44.85	45.18	43.03	44.95
1166	NASDAQ	CERS	Tue, Sep 25, 2001	45.49	45.50	43.55	43.82
1165	NASDAQ	CERS	Mon, Sep 24, 2001	46.60	47.28	44.64	45.00
1164	NASDAQ	CERS	Fri, Sep 21, 2001	46.59	47.20	44.93	45.06
1163	NASDAQ	CERS	Thu, Sep 20, 2001	46.50	48.59	44.85	47.48
1162	NASDAQ	CERS	Wed, Sep 19, 2001	47.37	49.00	42.01	49.00
1161	NASDAQ	CERS	Tue, Sep 18, 2001	49.50	49.90	46.47	46.50
1160	NASDAQ	CERS	Mon, Sep 17, 2001	48.00	50.99	47.90	50.07
1159	NASDAQ	CERS	Mon, Sep 10, 2001	49.80	52.68	49.55	50.92
1158	NASDAQ	CERS	Fri, Sep 7, 2001	49.72	50.20	48.75	49.86
1157	NASDAQ	CERS	Thu, Sep 6, 2001	52.40	52.40	49.91	50.58
1156	NASDAQ	CERS	Wed, Sep 5, 2001	51.82	53.10	51.82	52.38
1155	NASDAQ	CERS	Tue, Sep 4, 2001	54.05	56.00	52.01	52.61
1154	NASDAQ	CERS	Fri, Aug 31, 2001	55.02	55.75	53.24	53.82
1153	NASDAQ	CERS	Thu, Aug 30, 2001	56.36	56.65	54.66	55.30
1152	NASDAQ	CERS	Wed, Aug 29, 2001	58.10	58.15	56.38	56.75
1151	NASDAQ	CERS	Tue, Aug 28, 2001	58.24	59.26	56.50	57.13
1150	NASDAQ	CERS	Mon, Aug 27, 2001	58.05	59.24	58.05	58.94
1149	NASDAQ	CERS	Fri, Aug 24, 2001	59.91	60.34	56.79	59.00
1148	NASDAQ	CERS	Thu, Aug 23, 2001	59.97	60.89	59.50	60.00
1147	NASDAQ	CERS	Wed, Aug 22, 2001	59.26	61.00	58.75	59.80
1146	NASDAQ	CERS	Tue, Aug 21, 2001	59.68	60.14	59.15	59.26
1145	NASDAQ	CERS	Mon, Aug 20, 2001	59.88	61.78	56.79	60.01
1144	NASDAQ	CERS	Fri, Aug 17, 2001	60.07	60.10	57.35	57.55
1143	NASDAQ	CERS	Thu, Aug 16, 2001	56.25	59.49	55.60	58.45
1142	NASDAQ	CERS	Wed, Aug 15, 2001	60.51	61.73	56.76	57.55
1141	NASDAQ	CERS	Tue, Aug 14, 2001	61.52	63.00	60.32	61.64
1140	NASDAQ	CERS	Mon, Aug 13, 2001	60.86	62.95	60.86	62.43
1139	NASDAQ	CERS	Fri, Aug 10, 2001	62.32	63.75	61.00	63.00
1138	NASDAQ	CERS	Thu, Aug 9, 2001	63.05	63.05	59.00	62.80
1137	NASDAQ	CERS	Wed, Aug 8, 2001	63.25	63.25	62.05	62.85
1136	NASDAQ	CERS	Tue, Aug 7, 2001	64.00	65.05	62.75	62.80
1135	NASDAQ	CERS	Mon, Aug 6, 2001	64.01	64.19	63.00	63.10
1134	NASDAQ	CERS	Fri, Aug 3, 2001	67.16	67.16	64.01	64.31
1133	NASDAQ	CERS	Thu, Aug 2, 2001	64.81	68.05	63.00	66.05
1132	NASDAQ	CERS	Wed, Aug 1, 2001	61.70	64.10	59.83	63.90
1131	NASDAQ	CERS	Tue, Jul 31, 2001	62.33	63.00	60.51	60.90
1130	NASDAQ	CERS	Mon, Jul 30, 2001	63.65	64.00	61.50	62.62
1129	NASDAQ	CERS	Fri, Jul 27, 2001	66.35	66.39	63.70	64.04
1128	NASDAQ	CERS	Thu, Jul 26, 2001	66.71	68.00	65.05	66.60
1127	NASDAQ	CERS	Wed, Jul 25, 2001	64.95	67.69	64.27	67.16
1126	NASDAQ	CERS	Tue, Jul 24, 2001	68.00	68.51	66.01	67.15
1125	NASDAQ	CERS	Mon, Jul 23, 2001	70.03	71.64	68.16	68.16
1124	NASDAQ	CERS	Fri, Jul 20, 2001	71.75	73.00	69.97	71.10
1123	NASDAQ	CERS	Thu, Jul 19, 2001	71.69	74.16	71.38	73.28
1122	NASDAQ	CERS	Wed, Jul 18, 2001	70.19	71.60	69.17	71.31
1121	NASDAQ	CERS	Tue, Jul 17, 2001	65.80	70.41	65.80	70.35
1120	NASDAQ	CERS	Mon, Jul 16, 2001	69.90	69.90	65.85	65.85
1119	NASDAQ	CERS	Fri, Jul 13, 2001	67.00	70.00	67.00	69.25
1118	NASDAQ	CERS	Thu, Jul 12, 2001	66.56	68.41	65.74	68.00
1117	NASDAQ	CERS	Wed, Jul 11, 2001	68.05	69.00	62.05	66.55
1116	NASDAQ	CERS	Tue, Jul 10, 2001	71.01	71.25	68.48	69.50
1115	NASDAQ	CERS	Mon, Jul 9, 2001	70.11	72.78	70.03	71.24
1114	NASDAQ	CERS	Fri, Jul 6, 2001	75.80	75.80	68.70	70.00
1113	NASDAQ	CERS	Thu, Jul 5, 2001	75.50	75.59	74.76	75.27
1112	NASDAQ	CERS	Tue, Jul 3, 2001	73.30	75.50	73.30	75.35
1111	NASDAQ	CERS	Mon, Jul 2, 2001	72.98	74.41	72.95	73.50
1110	NASDAQ	CERS	Fri, Jun 29, 2001	72.74	73.80	72.15	72.57
1109	NASDAQ	CERS	Thu, Jun 28, 2001	68.60	72.25	68.60	71.50
1108	NASDAQ	CERS	Wed, Jun 27, 2001	68.70	69.68	67.63	68.21
1107	NASDAQ	CERS	Tue, Jun 26, 2001	65.51	68.89	65.51	68.46
1106	NASDAQ	CERS	Mon, Jun 25, 2001	67.00	67.51	66.00	66.08
1105	NASDAQ	CERS	Fri, Jun 22, 2001	69.50	69.50	66.50	67.48
1104	NASDAQ	CERS	Thu, Jun 21, 2001	69.60	70.39	67.61	68.93
1103	NASDAQ	CERS	Wed, Jun 20, 2001	68.00	70.05	67.79	69.50
1102	NASDAQ	CERS	Tue, Jun 19, 2001	68.22	69.00	67.12	67.80
1101	NASDAQ	CERS	Mon, Jun 18, 2001	69.00	70.50	66.25	66.25
1100	NASDAQ	CERS	Fri, Jun 15, 2001	68.99	71.02	68.31	69.65
1099	NASDAQ	CERS	Thu, Jun 14, 2001	71.15	72.10	67.05	70.46
1098	NASDAQ	CERS	Wed, Jun 13, 2001	72.00	72.25	71.28	71.99
1097	NASDAQ	CERS	Tue, Jun 12, 2001	71.40	72.27	71.05	71.48
1096	NASDAQ	CERS	Mon, Jun 11, 2001	71.30	74.20	70.61	73.14
1095	NASDAQ	CERS	Fri, Jun 8, 2001	75.50	75.50	72.49	73.13
1094	NASDAQ	CERS	Thu, Jun 7, 2001	74.65	75.90	74.05	75.27
1093	NASDAQ	CERS	Wed, Jun 6, 2001	72.74	76.00	72.00	75.10
1092	NASDAQ	CERS	Tue, Jun 5, 2001	70.31	74.50	70.05	73.65
1091	NASDAQ	CERS	Mon, Jun 4, 2001	68.25	68.50	66.16	67.81
1090	NASDAQ	CERS	Fri, Jun 1, 2001	62.50	66.00	62.50	66.00
1089	NASDAQ	CERS	Thu, May 31, 2001	59.75	63.41	59.75	62.65
1088	NASDAQ	CERS	Wed, May 30, 2001	63.65	63.99	59.80	60.53
1087	NASDAQ	CERS	Tue, May 29, 2001	64.24	65.00	63.01	63.84
1086	NASDAQ	CERS	Fri, May 25, 2001	63.56	65.00	63.25	64.25
1085	NASDAQ	CERS	Thu, May 24, 2001	60.87	64.09	60.50	63.56
1084	NASDAQ	CERS	Wed, May 23, 2001	62.28	62.28	59.25	60.87
1083	NASDAQ	CERS	Tue, May 22, 2001	60.98	62.99	59.80	62.11
1082	NASDAQ	CERS	Mon, May 21, 2001	60.99	60.99	58.25	60.49
1081	NASDAQ	CERS	Fri, May 18, 2001	59.10	60.50	58.40	60.19
1080	NASDAQ	CERS	Thu, May 17, 2001	58.50	59.25	57.36	59.00
1079	NASDAQ	CERS	Wed, May 16, 2001	52.77	59.25	52.77	58.42
1078	NASDAQ	CERS	Tue, May 15, 2001	54.01	54.13	53.00	54.05
1077	NASDAQ	CERS	Mon, May 14, 2001	52.13	55.06	52.13	54.74
1076	NASDAQ	CERS	Fri, May 11, 2001	57.26	57.44	52.18	52.99
1075	NASDAQ	CERS	Thu, May 10, 2001	58.89	60.00	57.23	57.75
1074	NASDAQ	CERS	Wed, May 9, 2001	56.36	60.00	56.36	57.48
1073	NASDAQ	CERS	Tue, May 8, 2001	58.75	58.75	54.55	57.79
1072	NASDAQ	CERS	Mon, May 7, 2001	57.75	58.70	56.46	56.85
1071	NASDAQ	CERS	Fri, May 4, 2001	58.35	58.35	53.25	57.55
1070	NASDAQ	CERS	Thu, May 3, 2001	59.90	59.90	56.60	57.88
1069	NASDAQ	CERS	Wed, May 2, 2001	56.90	61.15	52.76	59.95
1068	NASDAQ	CERS	Tue, May 1, 2001	55.80	57.25	55.20	57.25
1067	NASDAQ	CERS	Mon, Apr 30, 2001	54.99	57.08	53.15	55.55
1066	NASDAQ	CERS	Fri, Apr 27, 2001	54.79	55.00	53.10	54.90
1065	NASDAQ	CERS	Thu, Apr 26, 2001	50.39	51.79	49.20	51.30
1064	NASDAQ	CERS	Wed, Apr 25, 2001	49.48	50.99	45.50	49.40
1063	NASDAQ	CERS	Tue, Apr 24, 2001	46.47	47.97	46.47	47.97
1062	NASDAQ	CERS	Mon, Apr 23, 2001	48.27	48.27	46.47	46.87
1061	NASDAQ	CERS	Fri, Apr 20, 2001	47.59	48.32	46.50	48.32
1060	NASDAQ	CERS	Thu, Apr 19, 2001	47.81	48.11	46.32	47.01
1059	NASDAQ	CERS	Wed, Apr 18, 2001	45.90	48.25	45.65	48.25
1058	NASDAQ	CERS	Tue, Apr 17, 2001	41.62	44.90	41.15	44.79
1057	NASDAQ	CERS	Mon, Apr 16, 2001	44.00	44.94	41.90	42.12
1056	NASDAQ	CERS	Thu, Apr 12, 2001	44.85	45.30	43.23	43.99
1055	NASDAQ	CERS	Wed, Apr 11, 2001	43.31	45.20	42.99	44.51
1054	NASDAQ	CERS	Tue, Apr 10, 2001	40.30	42.95	40.30	41.77
1053	NASDAQ	CERS	Mon, Apr 9, 2001	36.15	40.29	36.00	40.29
1052	NASDAQ	CERS	Fri, Apr 6, 2001	36.00	39.13	34.50	36.00
1051	NASDAQ	CERS	Thu, Apr 5, 2001	35.75	38.25	33.83	37.00
1050	NASDAQ	CERS	Wed, Apr 4, 2001	35.81	36.06	32.25	33.63
1049	NASDAQ	CERS	Tue, Apr 3, 2001	37.00	38.75	34.50	35.69
1048	NASDAQ	CERS	Mon, Apr 2, 2001	43.38	44.00	37.13	39.00
1047	NASDAQ	CERS	Fri, Mar 30, 2001	41.56	44.19	40.75	44.13
1046	NASDAQ	CERS	Thu, Mar 29, 2001	37.00	41.25	36.75	40.56
1045	NASDAQ	CERS	Wed, Mar 28, 2001	43.00	44.31	41.44	41.50
1044	NASDAQ	CERS	Tue, Mar 27, 2001	43.38	45.13	43.38	44.44
1043	NASDAQ	CERS	Mon, Mar 26, 2001	45.50	48.63	44.41	44.63
1042	NASDAQ	CERS	Fri, Mar 23, 2001	43.25	47.63	43.23	43.56
1041	NASDAQ	CERS	Thu, Mar 22, 2001	37.25	43.50	31.69	43.25
1040	NASDAQ	CERS	Wed, Mar 21, 2001	48.38	48.38	37.75	38.19
1039	NASDAQ	CERS	Tue, Mar 20, 2001	46.77	48.50	46.77	47.44
1038	NASDAQ	CERS	Mon, Mar 19, 2001	50.13	50.13	44.56	46.75
1037	NASDAQ	CERS	Fri, Mar 16, 2001	53.63	53.63	48.25	49.63
1036	NASDAQ	CERS	Thu, Mar 15, 2001	55.25	56.00	52.00	52.25
1035	NASDAQ	CERS	Wed, Mar 14, 2001	54.38	57.13	53.69	54.44
1034	NASDAQ	CERS	Tue, Mar 13, 2001	54.88	56.31	53.25	55.81
1033	NASDAQ	CERS	Mon, Mar 12, 2001	57.31	57.38	53.25	53.25
1032	NASDAQ	CERS	Fri, Mar 9, 2001	58.88	60.25	58.56	58.75
1031	NASDAQ	CERS	Thu, Mar 8, 2001	58.31	59.75	58.25	58.88
1030	NASDAQ	CERS	Wed, Mar 7, 2001	57.88	60.31	57.86	59.38
1029	NASDAQ	CERS	Tue, Mar 6, 2001	55.69	57.75	55.50	57.19
1028	NASDAQ	CERS	Mon, Mar 5, 2001	57.13	57.75	54.50	55.44
1027	NASDAQ	CERS	Fri, Mar 2, 2001	54.75	57.00	54.63	56.69
1026	NASDAQ	CERS	Thu, Mar 1, 2001	57.25	58.00	53.25	55.06
1025	NASDAQ	CERS	Wed, Feb 28, 2001	61.00	61.00	56.25	57.94
1024	NASDAQ	CERS	Tue, Feb 27, 2001	60.00	63.75	59.88	60.00
1023	NASDAQ	CERS	Mon, Feb 26, 2001	55.94	61.75	55.81	60.88
1022	NASDAQ	CERS	Fri, Feb 23, 2001	58.00	58.00	50.00	55.25
1021	NASDAQ	CERS	Thu, Feb 22, 2001	60.81	61.56	56.75	58.06
1020	NASDAQ	CERS	Wed, Feb 21, 2001	58.75	62.00	58.75	61.94
1019	NASDAQ	CERS	Tue, Feb 20, 2001	62.38	62.50	60.63	60.88
1018	NASDAQ	CERS	Fri, Feb 16, 2001	62.00	62.25	60.44	61.38
1017	NASDAQ	CERS	Thu, Feb 15, 2001	61.38	62.50	61.38	62.50
1016	NASDAQ	CERS	Wed, Feb 14, 2001	62.94	62.94	60.88	62.50
1015	NASDAQ	CERS	Tue, Feb 13, 2001	63.50	63.50	61.00	63.00
1014	NASDAQ	CERS	Mon, Feb 12, 2001	63.88	65.00	62.56	63.59
1013	NASDAQ	CERS	Fri, Feb 9, 2001	66.50	66.88	62.00	63.00
1012	NASDAQ	CERS	Thu, Feb 8, 2001	68.13	68.25	66.25	66.50
1011	NASDAQ	CERS	Wed, Feb 7, 2001	65.50	68.25	65.50	68.25
1010	NASDAQ	CERS	Tue, Feb 6, 2001	65.50	67.94	65.50	66.69
1009	NASDAQ	CERS	Mon, Feb 5, 2001	68.56	68.56	63.06	65.94
1008	NASDAQ	CERS	Fri, Feb 2, 2001	70.00	70.00	67.25	67.50
1007	NASDAQ	CERS	Thu, Feb 1, 2001	69.00	70.00	68.25	69.50
1006	NASDAQ	CERS	Wed, Jan 31, 2001	70.63	71.88	67.75	68.50
1005	NASDAQ	CERS	Tue, Jan 30, 2001	70.31	71.25	69.00	70.88
1004	NASDAQ	CERS	Mon, Jan 29, 2001	66.75	71.75	66.75	71.00
1003	NASDAQ	CERS	Fri, Jan 26, 2001	69.25	69.25	66.63	67.63
1002	NASDAQ	CERS	Thu, Jan 25, 2001	67.25	70.19	67.00	67.88
1001	NASDAQ	CERS	Wed, Jan 24, 2001	68.00	70.25	66.25	70.00
1000	NASDAQ	CERS	Tue, Jan 23, 2001	60.69	67.75	60.63	67.00
999	NASDAQ	CERS	Mon, Jan 22, 2001	59.69	60.63	57.94	59.88
998	NASDAQ	CERS	Fri, Jan 19, 2001	60.31	61.00	58.13	59.69
997	NASDAQ	CERS	Thu, Jan 18, 2001	62.00	62.00	59.25	60.00
996	NASDAQ	CERS	Wed, Jan 17, 2001	66.31	68.00	62.00	62.00
995	NASDAQ	CERS	Tue, Jan 16, 2001	65.50	66.50	59.00	65.81
994	NASDAQ	CERS	Fri, Jan 12, 2001	60.00	67.75	60.00	64.00
993	NASDAQ	CERS	Thu, Jan 11, 2001	56.06	61.50	56.06	60.50
992	NASDAQ	CERS	Wed, Jan 10, 2001	53.50	57.00	53.00	56.19
991	NASDAQ	CERS	Tue, Jan 9, 2001	55.25	56.88	53.25	54.88
990	NASDAQ	CERS	Mon, Jan 8, 2001	60.50	60.50	55.25	56.50
989	NASDAQ	CERS	Fri, Jan 5, 2001	71.44	71.88	58.44	60.75
988	NASDAQ	CERS	Thu, Jan 4, 2001	70.00	74.00	69.25	72.13
987	NASDAQ	CERS	Wed, Jan 3, 2001	68.75	71.56	64.08	70.00
986	NASDAQ	CERS	Tue, Jan 2, 2001	76.56	76.56	69.00	69.75
985	NASDAQ	CERS	Fri, Dec 29, 2000	81.88	81.88	71.50	75.25
984	NASDAQ	CERS	Thu, Dec 28, 2000	79.75	81.25	79.25	80.50
983	NASDAQ	CERS	Wed, Dec 27, 2000	77.50	80.06	77.25	79.75
982	NASDAQ	CERS	Tue, Dec 26, 2000	71.38	77.44	71.28	77.25
981	NASDAQ	CERS	Fri, Dec 22, 2000	72.00	72.63	70.00	71.50
980	NASDAQ	CERS	Thu, Dec 21, 2000	64.00	70.00	64.00	70.00
979	NASDAQ	CERS	Wed, Dec 20, 2000	64.38	66.00	63.50	63.94
978	NASDAQ	CERS	Tue, Dec 19, 2000	63.52	68.44	63.25	68.44
977	NASDAQ	CERS	Mon, Dec 18, 2000	63.38	64.00	63.00	63.88
976	NASDAQ	CERS	Fri, Dec 15, 2000	61.73	64.13	61.44	63.88
975	NASDAQ	CERS	Thu, Dec 14, 2000	62.88	65.25	60.38	63.00
974	NASDAQ	CERS	Wed, Dec 13, 2000	65.00	67.00	62.88	62.88
973	NASDAQ	CERS	Tue, Dec 12, 2000	66.00	66.13	63.88	63.88
972	NASDAQ	CERS	Mon, Dec 11, 2000	68.25	68.38	66.75	66.75
971	NASDAQ	CERS	Fri, Dec 8, 2000	64.38	70.00	64.27	67.88
970	NASDAQ	CERS	Thu, Dec 7, 2000	64.38	66.88	62.50	63.94
969	NASDAQ	CERS	Wed, Dec 6, 2000	63.13	65.00	60.25	60.94
968	NASDAQ	CERS	Tue, Dec 5, 2000	59.64	64.19	59.64	62.38
967	NASDAQ	CERS	Mon, Dec 4, 2000	62.13	62.19	58.88	58.94
966	NASDAQ	CERS	Fri, Dec 1, 2000	59.94	63.00	57.63	62.25
965	NASDAQ	CERS	Thu, Nov 30, 2000	60.00	60.75	58.63	59.75
964	NASDAQ	CERS	Wed, Nov 29, 2000	58.00	62.25	58.00	61.50
963	NASDAQ	CERS	Tue, Nov 28, 2000	56.75	59.63	56.63	58.75
962	NASDAQ	CERS	Mon, Nov 27, 2000	56.75	59.75	55.88	57.75
961	NASDAQ	CERS	Fri, Nov 24, 2000	56.00	56.69	55.00	56.13
960	NASDAQ	CERS	Wed, Nov 22, 2000	58.50	58.50	53.88	55.00
959	NASDAQ	CERS	Tue, Nov 21, 2000	58.38	59.06	58.00	58.47
958	NASDAQ	CERS	Mon, Nov 20, 2000	58.25	59.88	58.25	58.61
957	NASDAQ	CERS	Fri, Nov 17, 2000	60.50	60.50	58.50	58.94
956	NASDAQ	CERS	Thu, Nov 16, 2000	56.25	59.75	56.25	58.88
955	NASDAQ	CERS	Wed, Nov 15, 2000	55.88	59.19	55.88	56.50
954	NASDAQ	CERS	Tue, Nov 14, 2000	55.75	57.63	55.25	56.13
953	NASDAQ	CERS	Mon, Nov 13, 2000	54.75	56.50	54.69	55.38
952	NASDAQ	CERS	Fri, Nov 10, 2000	60.50	60.63	59.13	59.13
951	NASDAQ	CERS	Thu, Nov 9, 2000	60.38	61.50	60.38	60.63
950	NASDAQ	CERS	Wed, Nov 8, 2000	59.00	62.13	59.00	61.88
949	NASDAQ	CERS	Tue, Nov 7, 2000	58.75	60.50	58.75	59.13
948	NASDAQ	CERS	Mon, Nov 6, 2000	61.13	61.13	59.25	59.44
947	NASDAQ	CERS	Fri, Nov 3, 2000	62.19	62.25	58.63	59.38
946	NASDAQ	CERS	Thu, Nov 2, 2000	55.13	59.50	55.13	59.00
945	NASDAQ	CERS	Wed, Nov 1, 2000	55.94	57.63	53.50	54.63
944	NASDAQ	CERS	Tue, Oct 31, 2000	54.00	55.88	53.13	55.88
943	NASDAQ	CERS	Mon, Oct 30, 2000	55.00	56.38	49.00	53.38
942	NASDAQ	CERS	Fri, Oct 27, 2000	58.75	59.69	53.88	56.31
941	NASDAQ	CERS	Thu, Oct 26, 2000	56.94	58.25	56.63	57.63
940	NASDAQ	CERS	Wed, Oct 25, 2000	57.63	57.88	56.25	56.59
939	NASDAQ	CERS	Tue, Oct 24, 2000	54.63	58.13	54.63	56.88
938	NASDAQ	CERS	Mon, Oct 23, 2000	52.25	56.25	51.75	55.00
937	NASDAQ	CERS	Fri, Oct 20, 2000	57.75	57.75	52.00	53.56
936	NASDAQ	CERS	Thu, Oct 19, 2000	49.00	59.75	49.00	57.50
935	NASDAQ	CERS	Wed, Oct 18, 2000	48.25	52.00	47.75	49.25
934	NASDAQ	CERS	Tue, Oct 17, 2000	48.00	48.75	47.56	48.25
933	NASDAQ	CERS	Mon, Oct 16, 2000	46.86	48.88	46.00	48.38
932	NASDAQ	CERS	Fri, Oct 13, 2000	43.38	46.88	42.75	46.88
931	NASDAQ	CERS	Thu, Oct 12, 2000	45.63	46.88	43.75	43.75
930	NASDAQ	CERS	Wed, Oct 11, 2000	48.38	48.38	43.88	44.00
929	NASDAQ	CERS	Tue, Oct 10, 2000	47.94	49.91	46.75	47.00
928	NASDAQ	CERS	Mon, Oct 9, 2000	49.69	49.73	47.75	47.75
927	NASDAQ	CERS	Fri, Oct 6, 2000	49.81	49.81	48.00	49.13
926	NASDAQ	CERS	Thu, Oct 5, 2000	51.63	53.63	49.00	49.13
925	NASDAQ	CERS	Wed, Oct 4, 2000	52.75	53.88	51.63	51.63
924	NASDAQ	CERS	Tue, Oct 3, 2000	53.63	53.69	52.88	53.25
923	NASDAQ	CERS	Mon, Oct 2, 2000	55.50	56.13	52.63	52.69
922	NASDAQ	CERS	Fri, Sep 29, 2000	53.00	56.50	53.00	55.50
921	NASDAQ	CERS	Thu, Sep 28, 2000	48.00	55.38	48.00	55.38
920	NASDAQ	CERS	Wed, Sep 27, 2000	48.38	48.38	47.50	48.13
919	NASDAQ	CERS	Tue, Sep 26, 2000	46.00	47.13	46.00	46.88
918	NASDAQ	CERS	Mon, Sep 25, 2000	46.50	47.00	45.88	46.69
917	NASDAQ	CERS	Fri, Sep 22, 2000	45.19	46.13	43.69	46.00
916	NASDAQ	CERS	Thu, Sep 21, 2000	47.69	47.69	45.75	45.91
915	NASDAQ	CERS	Wed, Sep 20, 2000	46.75	48.38	46.50	46.50
914	NASDAQ	CERS	Tue, Sep 19, 2000	45.00	47.00	43.50	46.25
913	NASDAQ	CERS	Mon, Sep 18, 2000	47.81	48.00	42.50	43.00
912	NASDAQ	CERS	Fri, Sep 15, 2000	47.75	48.25	47.63	48.00
911	NASDAQ	CERS	Thu, Sep 14, 2000	47.31	51.13	47.31	48.69
910	NASDAQ	CERS	Wed, Sep 13, 2000	47.38	47.63	46.38	47.19
909	NASDAQ	CERS	Tue, Sep 12, 2000	48.13	48.38	47.00	47.13
908	NASDAQ	CERS	Mon, Sep 11, 2000	48.28	48.63	47.56	47.88
907	NASDAQ	CERS	Fri, Sep 8, 2000	48.75	48.88	47.69	48.00
906	NASDAQ	CERS	Thu, Sep 7, 2000	48.63	49.06	47.88	48.75
905	NASDAQ	CERS	Wed, Sep 6, 2000	51.00	51.56	47.75	47.75
904	NASDAQ	CERS	Tue, Sep 5, 2000	49.50	51.25	49.06	51.13
903	NASDAQ	CERS	Fri, Sep 1, 2000	53.31	53.50	49.00	49.00
902	NASDAQ	CERS	Thu, Aug 31, 2000	53.88	54.13	52.88	53.06
901	NASDAQ	CERS	Wed, Aug 30, 2000	55.00	55.00	52.00	53.13
900	NASDAQ	CERS	Tue, Aug 29, 2000	54.88	55.31	54.75	54.75
899	NASDAQ	CERS	Mon, Aug 28, 2000	54.88	55.13	54.75	55.00
898	NASDAQ	CERS	Fri, Aug 25, 2000	54.75	55.13	54.75	55.06
897	NASDAQ	CERS	Thu, Aug 24, 2000	54.69	56.36	54.69	54.94
896	NASDAQ	CERS	Wed, Aug 23, 2000	55.19	55.19	54.69	54.69
895	NASDAQ	CERS	Tue, Aug 22, 2000	56.00	56.50	54.75	55.00
894	NASDAQ	CERS	Mon, Aug 21, 2000	54.50	56.00	54.50	55.38
893	NASDAQ	CERS	Fri, Aug 18, 2000	55.13	55.13	54.75	54.81
892	NASDAQ	CERS	Thu, Aug 17, 2000	54.75	56.00	54.75	55.00
891	NASDAQ	CERS	Wed, Aug 16, 2000	55.25	55.63	54.31	54.38
890	NASDAQ	CERS	Tue, Aug 15, 2000	56.13	56.50	55.38	55.38
889	NASDAQ	CERS	Mon, Aug 14, 2000	56.63	56.75	55.88	56.00
888	NASDAQ	CERS	Fri, Aug 11, 2000	55.00	56.63	53.41	56.63
887	NASDAQ	CERS	Thu, Aug 10, 2000	55.00	55.38	54.69	55.31
886	NASDAQ	CERS	Wed, Aug 9, 2000	59.50	59.50	53.00	54.38
885	NASDAQ	CERS	Tue, Aug 8, 2000	59.63	61.13	59.00	59.88
884	NASDAQ	CERS	Mon, Aug 7, 2000	58.88	59.88	58.50	59.63
883	NASDAQ	CERS	Fri, Aug 4, 2000	59.00	59.00	56.50	57.75
882	NASDAQ	CERS	Thu, Aug 3, 2000	55.25	60.50	55.25	58.19
881	NASDAQ	CERS	Wed, Aug 2, 2000	54.88	56.13	54.25	56.00
880	NASDAQ	CERS	Tue, Aug 1, 2000	55.38	55.75	54.25	54.50
879	NASDAQ	CERS	Mon, Jul 31, 2000	55.38	57.25	54.63	56.00
878	NASDAQ	CERS	Fri, Jul 28, 2000	57.75	58.50	53.25	54.94
877	NASDAQ	CERS	Thu, Jul 27, 2000	58.88	59.63	58.00	58.00
876	NASDAQ	CERS	Wed, Jul 26, 2000	58.00	59.13	55.75	58.75
875	NASDAQ	CERS	Tue, Jul 25, 2000	61.38	61.38	58.00	58.50
874	NASDAQ	CERS	Mon, Jul 24, 2000	60.00	63.00	59.13	60.50
873	NASDAQ	CERS	Fri, Jul 21, 2000	60.50	61.00	58.88	59.88
872	NASDAQ	CERS	Thu, Jul 20, 2000	60.25	64.50	59.50	63.63
871	NASDAQ	CERS	Wed, Jul 19, 2000	61.50	62.25	60.00	61.88
870	NASDAQ	CERS	Tue, Jul 18, 2000	59.88	64.00	59.00	62.19
869	NASDAQ	CERS	Mon, Jul 17, 2000	58.63	59.75	57.56	59.69
868	NASDAQ	CERS	Fri, Jul 14, 2000	57.22	58.50	57.13	58.38
867	NASDAQ	CERS	Thu, Jul 13, 2000	54.75	58.00	54.75	57.06
866	NASDAQ	CERS	Wed, Jul 12, 2000	53.13	55.13	53.13	54.88
865	NASDAQ	CERS	Tue, Jul 11, 2000	54.00	54.13	53.50	53.94
864	NASDAQ	CERS	Mon, Jul 10, 2000	53.00	53.75	52.75	53.75
863	NASDAQ	CERS	Fri, Jul 7, 2000	54.00	54.50	52.63	53.13
862	NASDAQ	CERS	Thu, Jul 6, 2000	49.88	53.50	49.81	53.00
861	NASDAQ	CERS	Wed, Jul 5, 2000	50.13	51.00	48.50	50.00
860	NASDAQ	CERS	Mon, Jul 3, 2000	51.25	52.25	48.56	49.50
859	NASDAQ	CERS	Fri, Jun 30, 2000	53.63	55.44	47.75	51.19
858	NASDAQ	CERS	Thu, Jun 29, 2000	50.25	54.88	49.50	53.69
857	NASDAQ	CERS	Wed, Jun 28, 2000	48.75	50.25	48.75	49.75
856	NASDAQ	CERS	Tue, Jun 27, 2000	47.25	49.25	46.88	48.75
855	NASDAQ	CERS	Mon, Jun 26, 2000	45.63	50.00	45.38	47.88
854	NASDAQ	CERS	Fri, Jun 23, 2000	44.25	47.38	43.38	45.88
853	NASDAQ	CERS	Thu, Jun 22, 2000	47.25	47.38	43.00	43.44
852	NASDAQ	CERS	Wed, Jun 21, 2000	44.13	47.00	44.13	46.13
851	NASDAQ	CERS	Tue, Jun 20, 2000	43.50	45.13	42.88	44.00
850	NASDAQ	CERS	Mon, Jun 19, 2000	43.75	44.13	42.63	42.63
849	NASDAQ	CERS	Fri, Jun 16, 2000	44.25	44.25	43.75	43.75
848	NASDAQ	CERS	Thu, Jun 15, 2000	43.50	44.38	41.75	44.19
847	NASDAQ	CERS	Wed, Jun 14, 2000	42.19	44.50	41.38	44.00
846	NASDAQ	CERS	Tue, Jun 13, 2000	42.00	42.69	40.75	41.63
845	NASDAQ	CERS	Mon, Jun 12, 2000	44.25	46.13	42.00	42.75
844	NASDAQ	CERS	Fri, Jun 9, 2000	44.75	45.38	43.00	44.25
843	NASDAQ	CERS	Thu, Jun 8, 2000	46.00	46.06	42.50	44.44
842	NASDAQ	CERS	Wed, Jun 7, 2000	45.00	46.00	44.50	45.00
841	NASDAQ	CERS	Tue, Jun 6, 2000	43.00	47.00	42.75	45.50
840	NASDAQ	CERS	Mon, Jun 5, 2000	40.00	44.00	39.25	42.50
839	NASDAQ	CERS	Fri, Jun 2, 2000	39.50	40.38	39.25	40.02
838	NASDAQ	CERS	Thu, Jun 1, 2000	38.91	40.38	38.91	39.63
837	NASDAQ	CERS	Wed, May 31, 2000	39.50	39.50	38.25	39.00
836	NASDAQ	CERS	Tue, May 30, 2000	39.63	39.63	34.50	39.59
835	NASDAQ	CERS	Fri, May 26, 2000	38.88	39.00	38.13	39.00
834	NASDAQ	CERS	Thu, May 25, 2000	38.25	40.63	38.00	39.25
833	NASDAQ	CERS	Wed, May 24, 2000	39.00	40.00	37.13	38.50
832	NASDAQ	CERS	Tue, May 23, 2000	39.25	42.38	38.75	40.00
831	NASDAQ	CERS	Mon, May 22, 2000	40.00	40.00	38.13	38.75
830	NASDAQ	CERS	Fri, May 19, 2000	40.50	40.50	39.50	40.38
829	NASDAQ	CERS	Thu, May 18, 2000	40.50	40.50	40.00	40.50
828	NASDAQ	CERS	Wed, May 17, 2000	40.00	40.50	39.00	40.50
827	NASDAQ	CERS	Tue, May 16, 2000	40.25	40.25	39.00	39.06
826	NASDAQ	CERS	Mon, May 15, 2000	39.75	40.25	39.50	40.06
825	NASDAQ	CERS	Fri, May 12, 2000	38.75	39.88	37.50	39.13
824	NASDAQ	CERS	Thu, May 11, 2000	39.88	39.88	38.75	38.88
823	NASDAQ	CERS	Wed, May 10, 2000	40.00	40.00	38.00	39.88
822	NASDAQ	CERS	Tue, May 9, 2000	40.25	40.25	39.00	40.13
821	NASDAQ	CERS	Mon, May 8, 2000	39.75	40.00	39.00	40.00
820	NASDAQ	CERS	Fri, May 5, 2000	39.75	40.00	38.75	39.75
819	NASDAQ	CERS	Thu, May 4, 2000	37.88	39.50	35.75	39.00
818	NASDAQ	CERS	Wed, May 3, 2000	38.63	38.63	37.13	37.50
817	NASDAQ	CERS	Tue, May 2, 2000	38.50	40.00	36.94	38.00
816	NASDAQ	CERS	Mon, May 1, 2000	38.63	39.25	38.00	38.50
815	NASDAQ	CERS	Fri, Apr 28, 2000	38.00	41.25	36.75	37.00
814	NASDAQ	CERS	Thu, Apr 27, 2000	34.50	36.00	34.50	35.50
813	NASDAQ	CERS	Wed, Apr 26, 2000	34.50	37.00	34.50	35.50
812	NASDAQ	CERS	Tue, Apr 25, 2000	37.00	37.88	33.00	35.00
811	NASDAQ	CERS	Mon, Apr 24, 2000	34.50	37.50	33.25	37.25
810	NASDAQ	CERS	Thu, Apr 20, 2000	37.00	37.25	34.75	37.00
809	NASDAQ	CERS	Wed, Apr 19, 2000	32.00	39.75	31.75	37.88
808	NASDAQ	CERS	Tue, Apr 18, 2000	29.50	33.38	25.00	31.75
807	NASDAQ	CERS	Mon, Apr 17, 2000	33.00	33.00	28.50	29.00
806	NASDAQ	CERS	Fri, Apr 14, 2000	43.00	43.75	31.50	32.69
805	NASDAQ	CERS	Thu, Apr 13, 2000	41.00	43.69	40.75	43.00
804	NASDAQ	CERS	Wed, Apr 12, 2000	43.50	44.50	38.50	38.50
803	NASDAQ	CERS	Tue, Apr 11, 2000	46.00	46.00	43.94	44.75
802	NASDAQ	CERS	Mon, Apr 10, 2000	46.06	47.50	44.00	45.75
801	NASDAQ	CERS	Fri, Apr 7, 2000	45.50	47.25	45.00	46.00
800	NASDAQ	CERS	Thu, Apr 6, 2000	41.00	48.25	41.00	42.38
799	NASDAQ	CERS	Wed, Apr 5, 2000	37.00	41.75	37.00	40.13
798	NASDAQ	CERS	Tue, Apr 4, 2000	47.31	47.38	35.00	39.88
797	NASDAQ	CERS	Mon, Apr 3, 2000	48.50	48.50	45.00	45.00
796	NASDAQ	CERS	Fri, Mar 31, 2000	47.50	48.56	44.75	48.25
795	NASDAQ	CERS	Thu, Mar 30, 2000	47.00	49.00	44.75	49.00
794	NASDAQ	CERS	Wed, Mar 29, 2000	48.13	50.75	46.50	48.19
793	NASDAQ	CERS	Tue, Mar 28, 2000	52.00	52.00	47.00	48.06
792	NASDAQ	CERS	Mon, Mar 27, 2000	49.75	52.00	49.00	50.25
791	NASDAQ	CERS	Fri, Mar 24, 2000	50.00	55.63	49.00	49.00
790	NASDAQ	CERS	Thu, Mar 23, 2000	50.00	55.63	49.00	50.50
789	NASDAQ	CERS	Wed, Mar 22, 2000	44.25	55.25	44.25	50.00
788	NASDAQ	CERS	Tue, Mar 21, 2000	51.50	51.50	44.13	44.50
787	NASDAQ	CERS	Mon, Mar 20, 2000	55.00	56.00	38.50	50.94
786	NASDAQ	CERS	Fri, Mar 17, 2000	51.13	56.88	50.25	53.88
785	NASDAQ	CERS	Thu, Mar 16, 2000	48.00	50.75	47.75	49.25
784	NASDAQ	CERS	Wed, Mar 15, 2000	53.00	53.00	46.50	47.25
783	NASDAQ	CERS	Tue, Mar 14, 2000	55.00	56.50	51.63	51.63
782	NASDAQ	CERS	Mon, Mar 13, 2000	58.13	59.50	52.00	54.13
781	NASDAQ	CERS	Fri, Mar 10, 2000	68.63	69.00	58.00	58.63
780	NASDAQ	CERS	Thu, Mar 9, 2000	70.38	70.38	66.00	68.63
779	NASDAQ	CERS	Wed, Mar 8, 2000	72.00	72.00	61.25	69.50
778	NASDAQ	CERS	Tue, Mar 7, 2000	67.13	78.50	66.50	70.00
777	NASDAQ	CERS	Mon, Mar 6, 2000	58.50	69.75	58.50	67.00
776	NASDAQ	CERS	Fri, Mar 3, 2000	57.00	59.50	56.50	58.13
775	NASDAQ	CERS	Thu, Mar 2, 2000	48.75	56.88	48.75	56.88
774	NASDAQ	CERS	Wed, Mar 1, 2000	47.88	49.00	47.88	49.00
773	NASDAQ	CERS	Tue, Feb 29, 2000	46.13	50.00	46.13	48.25
772	NASDAQ	CERS	Mon, Feb 28, 2000	47.75	47.75	46.13	47.25
771	NASDAQ	CERS	Fri, Feb 25, 2000	48.00	49.00	46.75	46.75
770	NASDAQ	CERS	Thu, Feb 24, 2000	47.13	48.63	47.13	48.00
769	NASDAQ	CERS	Wed, Feb 23, 2000	48.88	49.50	47.00	48.06
768	NASDAQ	CERS	Tue, Feb 22, 2000	50.00	50.75	47.06	49.50
767	NASDAQ	CERS	Fri, Feb 18, 2000	50.75	52.63	48.63	49.13
766	NASDAQ	CERS	Thu, Feb 17, 2000	41.13	46.75	40.69	46.00
765	NASDAQ	CERS	Wed, Feb 16, 2000	37.00	40.88	37.00	40.50
764	NASDAQ	CERS	Tue, Feb 15, 2000	35.50	37.50	35.00	36.75
763	NASDAQ	CERS	Mon, Feb 14, 2000	37.88	38.50	34.63	35.13
762	NASDAQ	CERS	Fri, Feb 11, 2000	39.50	39.50	37.00	38.50
761	NASDAQ	CERS	Thu, Feb 10, 2000	42.00	42.00	38.88	38.88
760	NASDAQ	CERS	Wed, Feb 9, 2000	40.38	42.00	40.00	41.50
759	NASDAQ	CERS	Tue, Feb 8, 2000	38.31	41.38	38.13	40.38
758	NASDAQ	CERS	Mon, Feb 7, 2000	37.50	39.25	37.50	38.31
757	NASDAQ	CERS	Fri, Feb 4, 2000	37.31	38.50	37.00	37.00
756	NASDAQ	CERS	Thu, Feb 3, 2000	35.38	39.13	34.00	37.63
755	NASDAQ	CERS	Wed, Feb 2, 2000	36.25	36.38	33.25	35.25
754	NASDAQ	CERS	Tue, Feb 1, 2000	36.00	36.06	34.88	35.63
753	NASDAQ	CERS	Mon, Jan 31, 2000	36.25	38.50	36.25	37.00
752	NASDAQ	CERS	Fri, Jan 28, 2000	38.56	38.56	34.88	36.88
751	NASDAQ	CERS	Thu, Jan 27, 2000	39.50	41.00	38.63	39.25
750	NASDAQ	CERS	Wed, Jan 26, 2000	41.00	41.25	39.00	39.50
749	NASDAQ	CERS	Tue, Jan 25, 2000	42.75	42.75	39.88	41.00
748	NASDAQ	CERS	Mon, Jan 24, 2000	38.50	42.50	38.38	42.25
747	NASDAQ	CERS	Fri, Jan 21, 2000	37.25	38.00	36.63	37.75
746	NASDAQ	CERS	Thu, Jan 20, 2000	37.25	38.13	37.25	37.50
745	NASDAQ	CERS	Wed, Jan 19, 2000	37.38	38.50	37.00	37.00
744	NASDAQ	CERS	Tue, Jan 18, 2000	38.00	38.75	37.00	37.63
743	NASDAQ	CERS	Fri, Jan 14, 2000	33.31	39.50	33.31	37.13
742	NASDAQ	CERS	Thu, Jan 13, 2000	35.25	35.38	32.38	32.38
741	NASDAQ	CERS	Wed, Jan 12, 2000	30.38	34.13	30.00	34.00
740	NASDAQ	CERS	Tue, Jan 11, 2000	27.38	30.38	27.38	30.00
739	NASDAQ	CERS	Mon, Jan 10, 2000	26.00	26.75	25.50	26.75
738	NASDAQ	CERS	Fri, Jan 7, 2000	25.75	26.00	25.00	26.00
737	NASDAQ	CERS	Thu, Jan 6, 2000	25.50	25.75	25.13	25.69
736	NASDAQ	CERS	Wed, Jan 5, 2000	25.63	25.75	25.00	25.75
735	NASDAQ	CERS	Tue, Jan 4, 2000	24.75	26.00	24.75	25.00
734	NASDAQ	CERS	Mon, Jan 3, 2000	27.00	27.00	24.63	24.88
733	NASDAQ	CERS	Fri, Dec 31, 1999	27.63	27.63	26.50	26.50
732	NASDAQ	CERS	Thu, Dec 30, 1999	27.63	28.00	27.00	27.25
731	NASDAQ	CERS	Wed, Dec 29, 1999	27.25	27.75	26.75	27.38
730	NASDAQ	CERS	Tue, Dec 28, 1999	26.00	27.00	25.75	27.00
729	NASDAQ	CERS	Mon, Dec 27, 1999	26.00	26.50	25.50	25.63
728	NASDAQ	CERS	Thu, Dec 23, 1999	25.63	26.00	25.38	25.75
727	NASDAQ	CERS	Wed, Dec 22, 1999	25.63	25.75	25.25	25.50
726	NASDAQ	CERS	Tue, Dec 21, 1999	26.50	26.50	25.00	25.00
725	NASDAQ	CERS	Mon, Dec 20, 1999	28.50	28.50	26.38	26.44
724	NASDAQ	CERS	Fri, Dec 17, 1999	27.38	29.00	27.13	27.13
723	NASDAQ	CERS	Thu, Dec 16, 1999	28.88	29.00	27.50	27.50
722	NASDAQ	CERS	Wed, Dec 15, 1999	27.88	28.75	27.75	28.75
721	NASDAQ	CERS	Tue, Dec 14, 1999	28.25	28.38	26.63	27.63
720	NASDAQ	CERS	Mon, Dec 13, 1999	30.06	30.13	27.00	28.75
719	NASDAQ	CERS	Fri, Dec 10, 1999	28.06	30.25	27.69	30.13
718	NASDAQ	CERS	Thu, Dec 9, 1999	28.13	28.63	28.00	28.00
717	NASDAQ	CERS	Wed, Dec 8, 1999	29.38	29.38	28.00	28.00
716	NASDAQ	CERS	Tue, Dec 7, 1999	29.50	31.13	28.25	29.50
715	NASDAQ	CERS	Mon, Dec 6, 1999	29.50	29.50	28.88	29.25
714	NASDAQ	CERS	Fri, Dec 3, 1999	27.75	29.25	27.75	28.88
713	NASDAQ	CERS	Thu, Dec 2, 1999	26.50	28.13	26.13	28.13
712	NASDAQ	CERS	Wed, Dec 1, 1999	28.13	29.38	26.13	26.88
711	NASDAQ	CERS	Tue, Nov 30, 1999	27.63	28.50	26.00	26.25
710	NASDAQ	CERS	Mon, Nov 29, 1999	30.13	30.13	26.75	27.25
709	NASDAQ	CERS	Fri, Nov 26, 1999	30.13	30.13	29.00	30.00
708	NASDAQ	CERS	Wed, Nov 24, 1999	30.50	30.50	29.13	30.13
707	NASDAQ	CERS	Tue, Nov 23, 1999	31.00	31.00	29.13	29.25
706	NASDAQ	CERS	Mon, Nov 22, 1999	28.38	31.00	28.00	31.00
705	NASDAQ	CERS	Fri, Nov 19, 1999	28.75	29.38	28.50	29.00
704	NASDAQ	CERS	Thu, Nov 18, 1999	29.00	29.94	28.75	29.38
703	NASDAQ	CERS	Wed, Nov 17, 1999	30.25	30.25	29.06	29.06
702	NASDAQ	CERS	Tue, Nov 16, 1999	29.63	31.06	29.63	30.25
701	NASDAQ	CERS	Mon, Nov 15, 1999	30.38	30.75	29.63	29.88
700	NASDAQ	CERS	Fri, Nov 12, 1999	27.00	30.38	27.00	30.31
699	NASDAQ	CERS	Thu, Nov 11, 1999	27.50	29.00	27.00	27.06
698	NASDAQ	CERS	Wed, Nov 10, 1999	28.00	29.13	27.00	28.00
697	NASDAQ	CERS	Tue, Nov 9, 1999	28.13	29.50	28.13	29.00
696	NASDAQ	CERS	Mon, Nov 8, 1999	28.00	29.50	28.00	28.63
695	NASDAQ	CERS	Fri, Nov 5, 1999	29.63	30.25	28.25	28.50
694	NASDAQ	CERS	Thu, Nov 4, 1999	29.63	30.38	29.00	29.75
693	NASDAQ	CERS	Wed, Nov 3, 1999	25.63	29.25	25.50	29.06
692	NASDAQ	CERS	Tue, Nov 2, 1999	27.00	27.25	25.63	26.25
691	NASDAQ	CERS	Mon, Nov 1, 1999	27.50	27.75	26.75	27.06
690	NASDAQ	CERS	Fri, Oct 29, 1999	27.50	28.50	26.63	27.69
689	NASDAQ	CERS	Thu, Oct 28, 1999	26.75	27.13	26.25	26.50
688	NASDAQ	CERS	Wed, Oct 27, 1999	24.38	27.00	23.88	26.25
687	NASDAQ	CERS	Tue, Oct 26, 1999	23.25	24.63	23.25	23.88
686	NASDAQ	CERS	Mon, Oct 25, 1999	23.44	23.44	22.00	22.50
685	NASDAQ	CERS	Fri, Oct 22, 1999	23.75	24.00	23.63	23.63
684	NASDAQ	CERS	Thu, Oct 21, 1999	23.63	24.38	23.13	23.91
683	NASDAQ	CERS	Wed, Oct 20, 1999	24.25	24.44	23.50	24.13
682	NASDAQ	CERS	Tue, Oct 19, 1999	24.31	24.31	20.81	23.00
681	NASDAQ	CERS	Mon, Oct 18, 1999	24.00	24.50	23.13	23.75
680	NASDAQ	CERS	Fri, Oct 15, 1999	24.25	24.31	23.63	24.25
679	NASDAQ	CERS	Thu, Oct 14, 1999	24.50	24.50	22.75	23.75
678	NASDAQ	CERS	Wed, Oct 13, 1999	25.00	25.00	24.38	24.44
677	NASDAQ	CERS	Tue, Oct 12, 1999	25.00	25.13	24.75	24.81
676	NASDAQ	CERS	Mon, Oct 11, 1999	24.00	25.00	23.88	24.81
675	NASDAQ	CERS	Fri, Oct 8, 1999	23.38	24.50	23.25	24.50
674	NASDAQ	CERS	Thu, Oct 7, 1999	24.50	24.50	23.00	23.50
673	NASDAQ	CERS	Wed, Oct 6, 1999	23.00	25.75	22.94	23.88
672	NASDAQ	CERS	Tue, Oct 5, 1999	22.38	23.13	22.25	22.56
671	NASDAQ	CERS	Mon, Oct 4, 1999	21.63	22.25	21.63	22.13
670	NASDAQ	CERS	Fri, Oct 1, 1999	22.88	23.75	21.50	21.63
669	NASDAQ	CERS	Thu, Sep 30, 1999	20.75	24.00	20.75	23.25
668	NASDAQ	CERS	Wed, Sep 29, 1999	20.75	21.25	20.75	21.25
667	NASDAQ	CERS	Tue, Sep 28, 1999	21.94	21.94	20.69	21.13
666	NASDAQ	CERS	Mon, Sep 27, 1999	22.88	23.13	21.94	22.13
665	NASDAQ	CERS	Fri, Sep 24, 1999	22.75	23.00	22.25	22.25
664	NASDAQ	CERS	Thu, Sep 23, 1999	22.88	23.50	22.88	22.88
663	NASDAQ	CERS	Wed, Sep 22, 1999	23.50	23.50	22.88	22.88
662	NASDAQ	CERS	Tue, Sep 21, 1999	22.81	23.75	22.81	22.88
661	NASDAQ	CERS	Mon, Sep 20, 1999	23.63	23.63	22.81	23.00
660	NASDAQ	CERS	Fri, Sep 17, 1999	22.13	24.00	22.13	22.94
659	NASDAQ	CERS	Thu, Sep 16, 1999	24.25	24.25	20.38	22.25
658	NASDAQ	CERS	Wed, Sep 15, 1999	24.00	24.63	23.50	23.50
657	NASDAQ	CERS	Tue, Sep 14, 1999	26.50	26.63	24.00	24.50
656	NASDAQ	CERS	Mon, Sep 13, 1999	25.50	27.63	25.00	26.63
655	NASDAQ	CERS	Fri, Sep 10, 1999	26.00	26.50	25.63	25.75
654	NASDAQ	CERS	Thu, Sep 9, 1999	26.00	27.00	26.00	26.75
653	NASDAQ	CERS	Wed, Sep 8, 1999	26.13	26.63	26.00	26.63
652	NASDAQ	CERS	Tue, Sep 7, 1999	27.00	27.00	26.13	26.25
651	NASDAQ	CERS	Fri, Sep 3, 1999	27.75	27.94	27.13	27.19
650	NASDAQ	CERS	Thu, Sep 2, 1999	26.25	26.50	26.00	26.25
649	NASDAQ	CERS	Wed, Sep 1, 1999	27.00	27.50	26.38	26.63
648	NASDAQ	CERS	Tue, Aug 31, 1999	26.50	27.13	26.00	26.38
647	NASDAQ	CERS	Mon, Aug 30, 1999	27.00	27.19	26.50	26.50
646	NASDAQ	CERS	Fri, Aug 27, 1999	27.88	28.25	27.19	27.19
645	NASDAQ	CERS	Thu, Aug 26, 1999	28.13	28.63	27.88	27.88
644	NASDAQ	CERS	Wed, Aug 25, 1999	27.25	28.69	27.25	28.13
643	NASDAQ	CERS	Tue, Aug 24, 1999	27.50	28.00	27.25	27.50
642	NASDAQ	CERS	Mon, Aug 23, 1999	27.50	28.75	27.50	27.88
641	NASDAQ	CERS	Fri, Aug 20, 1999	27.88	28.25	27.88	28.00
640	NASDAQ	CERS	Thu, Aug 19, 1999	27.00	28.50	26.13	28.50
639	NASDAQ	CERS	Wed, Aug 18, 1999	26.13	27.50	26.00	27.25
638	NASDAQ	CERS	Tue, Aug 17, 1999	26.25	26.25	25.81	26.25
637	NASDAQ	CERS	Mon, Aug 16, 1999	24.91	26.75	24.81	26.25
636	NASDAQ	CERS	Fri, Aug 13, 1999	25.00	25.00	24.81	24.81
635	NASDAQ	CERS	Thu, Aug 12, 1999	25.25	26.00	24.94	24.94
634	NASDAQ	CERS	Wed, Aug 11, 1999	25.69	26.00	24.75	25.13
633	NASDAQ	CERS	Tue, Aug 10, 1999	26.75	27.00	23.88	25.75
632	NASDAQ	CERS	Mon, Aug 9, 1999	27.25	29.38	26.88	26.88
631	NASDAQ	CERS	Fri, Aug 6, 1999	26.38	27.75	26.38	27.38
630	NASDAQ	CERS	Thu, Aug 5, 1999	25.13	27.13	25.13	27.13
629	NASDAQ	CERS	Wed, Aug 4, 1999	24.75	25.75	24.75	25.38
628	NASDAQ	CERS	Tue, Aug 3, 1999	23.75	24.50	23.75	24.50
627	NASDAQ	CERS	Mon, Aug 2, 1999	24.25	24.25	23.75	24.25
626	NASDAQ	CERS	Fri, Jul 30, 1999	23.88	24.13	23.75	24.13
625	NASDAQ	CERS	Thu, Jul 29, 1999	23.88	23.88	23.38	23.88
624	NASDAQ	CERS	Wed, Jul 28, 1999	24.06	24.25	23.75	24.13
623	NASDAQ	CERS	Tue, Jul 27, 1999	24.13	24.44	23.63	24.19
622	NASDAQ	CERS	Mon, Jul 26, 1999	23.00	24.56	22.63	24.25
621	NASDAQ	CERS	Fri, Jul 23, 1999	23.38	23.38	22.88	23.06
620	NASDAQ	CERS	Thu, Jul 22, 1999	22.75	23.38	22.75	23.25
619	NASDAQ	CERS	Wed, Jul 21, 1999	22.75	23.19	22.50	22.50
618	NASDAQ	CERS	Tue, Jul 20, 1999	22.50	23.50	22.50	23.13
617	NASDAQ	CERS	Mon, Jul 19, 1999	24.13	24.13	22.50	23.13
616	NASDAQ	CERS	Fri, Jul 16, 1999	23.88	24.13	23.25	23.50
615	NASDAQ	CERS	Thu, Jul 15, 1999	23.00	24.38	22.75	24.00
614	NASDAQ	CERS	Wed, Jul 14, 1999	22.88	22.88	22.50	22.50
613	NASDAQ	CERS	Tue, Jul 13, 1999	23.63	23.63	22.13	22.50
612	NASDAQ	CERS	Mon, Jul 12, 1999	22.50	23.63	22.00	23.63
611	NASDAQ	CERS	Fri, Jul 9, 1999	22.19	22.38	21.88	22.38
610	NASDAQ	CERS	Thu, Jul 8, 1999	21.25	22.19	21.22	22.19
609	NASDAQ	CERS	Wed, Jul 7, 1999	23.00	23.00	20.75	21.25
608	NASDAQ	CERS	Tue, Jul 6, 1999	22.63	23.63	22.50	22.88
607	NASDAQ	CERS	Fri, Jul 2, 1999	23.00	23.00	22.63	22.75
606	NASDAQ	CERS	Thu, Jul 1, 1999	21.88	23.00	21.88	22.94
605	NASDAQ	CERS	Wed, Jun 30, 1999	22.63	23.00	21.50	22.00
604	NASDAQ	CERS	Tue, Jun 29, 1999	22.88	24.75	22.25	23.13
603	NASDAQ	CERS	Mon, Jun 28, 1999	21.13	23.88	20.75	23.25
602	NASDAQ	CERS	Fri, Jun 25, 1999	21.00	21.13	20.75	21.00
601	NASDAQ	CERS	Thu, Jun 24, 1999	21.25	21.38	19.31	20.94
600	NASDAQ	CERS	Wed, Jun 23, 1999	21.75	21.88	21.25	21.25
599	NASDAQ	CERS	Tue, Jun 22, 1999	21.75	21.88	21.69	21.81
598	NASDAQ	CERS	Mon, Jun 21, 1999	21.88	21.94	21.50	21.88
597	NASDAQ	CERS	Fri, Jun 18, 1999	21.25	21.81	21.13	21.69
596	NASDAQ	CERS	Thu, Jun 17, 1999	20.50	21.69	20.38	21.13
595	NASDAQ	CERS	Wed, Jun 16, 1999	19.25	20.44	19.00	20.06
594	NASDAQ	CERS	Tue, Jun 15, 1999	18.88	19.50	18.88	19.19
593	NASDAQ	CERS	Mon, Jun 14, 1999	19.00	19.13	18.75	19.00
592	NASDAQ	CERS	Fri, Jun 11, 1999	19.00	19.38	18.75	19.25
591	NASDAQ	CERS	Thu, Jun 10, 1999	18.69	19.38	18.56	19.38
590	NASDAQ	CERS	Wed, Jun 9, 1999	19.00	19.00	18.50	18.69
589	NASDAQ	CERS	Tue, Jun 8, 1999	18.75	19.00	18.50	18.75
588	NASDAQ	CERS	Mon, Jun 7, 1999	18.50	18.75	18.50	18.75
587	NASDAQ	CERS	Fri, Jun 4, 1999	18.88	19.25	17.75	18.75
586	NASDAQ	CERS	Thu, Jun 3, 1999	17.13	19.88	17.13	19.13
585	NASDAQ	CERS	Wed, Jun 2, 1999	17.00	17.13	16.50	17.13
584	NASDAQ	CERS	Tue, Jun 1, 1999	17.00	17.19	17.00	17.13
583	NASDAQ	CERS	Fri, May 28, 1999	17.00	17.25	16.88	17.13
582	NASDAQ	CERS	Thu, May 27, 1999	17.13	17.13	17.00	17.06
581	NASDAQ	CERS	Wed, May 26, 1999	17.38	17.38	16.88	17.00
580	NASDAQ	CERS	Tue, May 25, 1999	17.31	17.81	17.13	17.13
579	NASDAQ	CERS	Mon, May 24, 1999	17.50	17.81	17.13	17.13
578	NASDAQ	CERS	Fri, May 21, 1999	17.50	17.88	17.25	17.50
577	NASDAQ	CERS	Thu, May 20, 1999	16.50	17.75	16.50	17.75
576	NASDAQ	CERS	Wed, May 19, 1999	17.50	17.50	16.63	16.63
575	NASDAQ	CERS	Tue, May 18, 1999	17.75	18.63	17.38	17.50
574	NASDAQ	CERS	Mon, May 17, 1999	18.25	18.25	17.50	17.88
573	NASDAQ	CERS	Fri, May 14, 1999	19.00	19.00	17.38	17.88
572	NASDAQ	CERS	Thu, May 13, 1999	19.00	19.13	18.50	19.00
571	NASDAQ	CERS	Wed, May 12, 1999	17.63	19.06	17.00	19.00
570	NASDAQ	CERS	Tue, May 11, 1999	18.00	18.25	16.25	16.25
569	NASDAQ	CERS	Mon, May 10, 1999	17.50	18.25	17.38	17.56
568	NASDAQ	CERS	Fri, May 7, 1999	16.25	17.50	15.88	17.44
567	NASDAQ	CERS	Thu, May 6, 1999	16.00	16.25	16.00	16.13
566	NASDAQ	CERS	Wed, May 5, 1999	16.63	16.63	15.75	15.75
565	NASDAQ	CERS	Tue, May 4, 1999	16.25	16.38	15.75	16.00
564	NASDAQ	CERS	Mon, May 3, 1999	16.13	16.38	16.00	16.38
563	NASDAQ	CERS	Fri, Apr 30, 1999	16.75	17.00	16.00	16.38
562	NASDAQ	CERS	Thu, Apr 29, 1999	17.38	17.88	16.63	16.88
561	NASDAQ	CERS	Wed, Apr 28, 1999	16.00	18.25	16.00	17.88
560	NASDAQ	CERS	Tue, Apr 27, 1999	15.94	16.00	15.38	15.75
559	NASDAQ	CERS	Mon, Apr 26, 1999	16.13	16.50	15.25	15.44
558	NASDAQ	CERS	Fri, Apr 23, 1999	16.88	16.88	16.13	16.19
557	NASDAQ	CERS	Thu, Apr 22, 1999	16.75	16.75	16.38	16.38
556	NASDAQ	CERS	Wed, Apr 21, 1999	16.88	17.25	16.25	16.38
555	NASDAQ	CERS	Tue, Apr 20, 1999	17.50	18.00	16.88	17.00
554	NASDAQ	CERS	Mon, Apr 19, 1999	18.25	18.25	17.50	17.50
553	NASDAQ	CERS	Fri, Apr 16, 1999	17.88	17.88	17.25	17.50
552	NASDAQ	CERS	Thu, Apr 15, 1999	17.25	17.88	17.13	17.50
551	NASDAQ	CERS	Wed, Apr 14, 1999	18.13	18.38	17.25	17.25
550	NASDAQ	CERS	Tue, Apr 13, 1999	17.00	18.25	17.00	17.63
549	NASDAQ	CERS	Mon, Apr 12, 1999	17.25	17.63	16.25	16.88
548	NASDAQ	CERS	Fri, Apr 9, 1999	18.25	18.38	17.38	17.38
547	NASDAQ	CERS	Thu, Apr 8, 1999	18.25	18.25	17.00	17.88
546	NASDAQ	CERS	Wed, Apr 7, 1999	19.00	19.75	18.00	18.38
545	NASDAQ	CERS	Tue, Apr 6, 1999	20.75	21.00	19.00	19.00
544	NASDAQ	CERS	Mon, Apr 5, 1999	21.06	21.25	20.50	20.69
543	NASDAQ	CERS	Thu, Apr 1, 1999	21.00	21.73	20.75	21.06
542	NASDAQ	CERS	Wed, Mar 31, 1999	22.00	22.88	21.00	22.25
541	NASDAQ	CERS	Tue, Mar 30, 1999	22.81	23.13	19.00	22.25
540	NASDAQ	CERS	Mon, Mar 29, 1999	23.00	23.25	22.81	23.00
539	NASDAQ	CERS	Fri, Mar 26, 1999	23.50	23.63	23.00	23.25
538	NASDAQ	CERS	Thu, Mar 25, 1999	24.25	24.25	23.75	23.75
537	NASDAQ	CERS	Wed, Mar 24, 1999	24.00	24.13	23.50	23.50
536	NASDAQ	CERS	Tue, Mar 23, 1999	24.00	24.13	23.25	23.25
535	NASDAQ	CERS	Mon, Mar 22, 1999	23.00	24.00	23.00	24.00
534	NASDAQ	CERS	Fri, Mar 19, 1999	23.38	24.00	22.75	22.75
533	NASDAQ	CERS	Thu, Mar 18, 1999	24.00	24.00	23.00	24.00
532	NASDAQ	CERS	Wed, Mar 17, 1999	23.00	24.50	23.00	23.50
531	NASDAQ	CERS	Tue, Mar 16, 1999	24.88	24.88	23.00	23.00
530	NASDAQ	CERS	Mon, Mar 15, 1999	25.00	25.00	23.88	24.00
529	NASDAQ	CERS	Fri, Mar 12, 1999	23.88	24.25	23.88	23.88
528	NASDAQ	CERS	Thu, Mar 11, 1999	24.00	25.00	23.84	23.84
527	NASDAQ	CERS	Wed, Mar 10, 1999	24.38	24.75	24.00	24.00
526	NASDAQ	CERS	Tue, Mar 9, 1999	24.50	24.75	24.13	24.13
525	NASDAQ	CERS	Mon, Mar 8, 1999	25.13	25.13	24.50	24.75
524	NASDAQ	CERS	Fri, Mar 5, 1999	25.50	26.00	25.00	25.00
523	NASDAQ	CERS	Thu, Mar 4, 1999	26.50	26.50	25.13	25.19
522	NASDAQ	CERS	Wed, Mar 3, 1999	26.63	26.63	24.75	25.50
521	NASDAQ	CERS	Tue, Mar 2, 1999	25.75	26.63	25.75	26.63
520	NASDAQ	CERS	Mon, Mar 1, 1999	25.00	27.00	25.00	26.00
519	NASDAQ	CERS	Fri, Feb 26, 1999	26.63	26.63	26.13	26.63
518	NASDAQ	CERS	Thu, Feb 25, 1999	27.00	27.00	26.75	27.00
517	NASDAQ	CERS	Wed, Feb 24, 1999	27.25	27.25	26.63	27.00
516	NASDAQ	CERS	Tue, Feb 23, 1999	27.75	28.75	27.00	27.50
515	NASDAQ	CERS	Mon, Feb 22, 1999	27.00	27.88	27.00	27.50
514	NASDAQ	CERS	Fri, Feb 19, 1999	27.00	27.50	27.00	27.50
513	NASDAQ	CERS	Thu, Feb 18, 1999	27.63	28.25	27.00	27.00
512	NASDAQ	CERS	Wed, Feb 17, 1999	27.38	28.25	27.13	27.25
511	NASDAQ	CERS	Tue, Feb 16, 1999	27.38	28.75	27.38	27.38
510	NASDAQ	CERS	Fri, Feb 12, 1999	28.00	28.75	27.50	28.25
509	NASDAQ	CERS	Thu, Feb 11, 1999	30.00	30.00	29.25	29.25
508	NASDAQ	CERS	Wed, Feb 10, 1999	29.50	30.00	29.50	30.00
507	NASDAQ	CERS	Tue, Feb 9, 1999	29.63	30.25	29.25	29.50
506	NASDAQ	CERS	Mon, Feb 8, 1999	29.00	30.13	28.63	30.00
505	NASDAQ	CERS	Fri, Feb 5, 1999	29.88	29.88	28.56	28.75
504	NASDAQ	CERS	Thu, Feb 4, 1999	28.00	30.00	28.00	29.88
503	NASDAQ	CERS	Wed, Feb 3, 1999	28.00	30.00	28.00	28.88
502	NASDAQ	CERS	Tue, Feb 2, 1999	28.50	29.25	28.50	29.25
501	NASDAQ	CERS	Mon, Feb 1, 1999	27.00	28.50	27.00	28.50
500	NASDAQ	CERS	Fri, Jan 29, 1999	29.00	29.13	27.50	27.50
499	NASDAQ	CERS	Thu, Jan 28, 1999	28.50	29.00	26.63	28.00
498	NASDAQ	CERS	Wed, Jan 27, 1999	29.38	30.00	26.00	28.00
497	NASDAQ	CERS	Tue, Jan 26, 1999	31.00	33.00	30.50	31.25
496	NASDAQ	CERS	Mon, Jan 25, 1999	28.00	32.00	28.00	31.25
495	NASDAQ	CERS	Fri, Jan 22, 1999	27.63	29.75	27.63	29.44
494	NASDAQ	CERS	Thu, Jan 21, 1999	30.00	30.25	28.25	28.25
493	NASDAQ	CERS	Wed, Jan 20, 1999	32.13	32.13	28.75	29.63
492	NASDAQ	CERS	Tue, Jan 19, 1999	32.00	33.88	28.63	30.63
491	NASDAQ	CERS	Fri, Jan 15, 1999	29.38	30.25	27.00	29.50
490	NASDAQ	CERS	Thu, Jan 14, 1999	24.50	27.00	24.50	26.00
489	NASDAQ	CERS	Wed, Jan 13, 1999	21.88	26.00	21.00	24.56
488	NASDAQ	CERS	Tue, Jan 12, 1999	21.13	21.50	21.00	21.50
487	NASDAQ	CERS	Mon, Jan 11, 1999	20.88	21.13	20.50	20.56
486	NASDAQ	CERS	Fri, Jan 8, 1999	20.63	21.06	20.50	21.00
485	NASDAQ	CERS	Thu, Jan 7, 1999	21.50	21.88	20.13	20.25
484	NASDAQ	CERS	Wed, Jan 6, 1999	20.50	21.88	20.50	21.50
483	NASDAQ	CERS	Tue, Jan 5, 1999	20.75	21.00	20.38	20.44
482	NASDAQ	CERS	Mon, Jan 4, 1999	20.88	21.00	20.50	20.50
481	NASDAQ	CERS	Thu, Dec 31, 1998	19.63	21.00	19.63	21.00
480	NASDAQ	CERS	Wed, Dec 30, 1998	19.75	20.13	19.75	20.00
479	NASDAQ	CERS	Tue, Dec 29, 1998	20.00	20.00	19.75	20.00
478	NASDAQ	CERS	Mon, Dec 28, 1998	20.00	20.13	19.75	20.00
477	NASDAQ	CERS	Thu, Dec 24, 1998	20.13	20.13	19.50	19.75
476	NASDAQ	CERS	Wed, Dec 23, 1998	20.13	20.25	19.69	20.00
475	NASDAQ	CERS	Tue, Dec 22, 1998	20.00	20.25	19.75	20.00
474	NASDAQ	CERS	Mon, Dec 21, 1998	19.25	20.00	19.00	20.00
473	NASDAQ	CERS	Fri, Dec 18, 1998	19.13	19.63	18.50	19.63
472	NASDAQ	CERS	Thu, Dec 17, 1998	19.50	19.50	18.25	18.50
471	NASDAQ	CERS	Wed, Dec 16, 1998	17.00	18.50	16.75	18.50
470	NASDAQ	CERS	Tue, Dec 15, 1998	17.00	17.00	16.63	16.75
469	NASDAQ	CERS	Mon, Dec 14, 1998	17.25	17.25	16.38	16.38
468	NASDAQ	CERS	Fri, Dec 11, 1998	16.94	17.25	16.94	17.25
467	NASDAQ	CERS	Thu, Dec 10, 1998	16.88	17.25	16.88	17.13
466	NASDAQ	CERS	Wed, Dec 9, 1998	16.88	17.13	16.88	16.88
465	NASDAQ	CERS	Tue, Dec 8, 1998	17.25	17.25	16.63	16.63
464	NASDAQ	CERS	Mon, Dec 7, 1998	16.25	17.25	15.75	17.13
463	NASDAQ	CERS	Fri, Dec 4, 1998	15.50	16.13	15.00	15.13
462	NASDAQ	CERS	Thu, Dec 3, 1998	15.25	15.63	15.00	15.63
461	NASDAQ	CERS	Wed, Dec 2, 1998	16.88	16.88	14.81	14.88
460	NASDAQ	CERS	Tue, Dec 1, 1998	16.63	16.63	16.00	16.50
459	NASDAQ	CERS	Mon, Nov 30, 1998	16.88	16.88	16.75	16.75
458	NASDAQ	CERS	Fri, Nov 27, 1998	16.88	16.88	16.88	16.88
457	NASDAQ	CERS	Wed, Nov 25, 1998	16.88	16.88	16.50	16.75
456	NASDAQ	CERS	Tue, Nov 24, 1998	16.81	17.13	16.75	16.88
455	NASDAQ	CERS	Mon, Nov 23, 1998	16.25	16.63	16.00	16.63
454	NASDAQ	CERS	Fri, Nov 20, 1998	16.00	16.13	15.50	16.00
453	NASDAQ	CERS	Thu, Nov 19, 1998	15.38	16.50	15.25	15.75
452	NASDAQ	CERS	Wed, Nov 18, 1998	15.50	15.50	15.25	15.50
451	NASDAQ	CERS	Tue, Nov 17, 1998	15.25	15.88	15.25	15.75
450	NASDAQ	CERS	Mon, Nov 16, 1998	16.00	16.00	15.13	15.50
449	NASDAQ	CERS	Fri, Nov 13, 1998	16.00	16.00	15.50	15.50
448	NASDAQ	CERS	Thu, Nov 12, 1998	15.13	15.63	15.13	15.25
447	NASDAQ	CERS	Wed, Nov 11, 1998	16.13	16.13	15.00	15.75
446	NASDAQ	CERS	Tue, Nov 10, 1998	16.13	16.13	15.00	15.50
445	NASDAQ	CERS	Mon, Nov 9, 1998	15.88	16.13	15.25	15.75
444	NASDAQ	CERS	Fri, Nov 6, 1998	16.13	16.13	15.44	15.75
443	NASDAQ	CERS	Thu, Nov 5, 1998	15.50	16.50	15.00	16.13
442	NASDAQ	CERS	Wed, Nov 4, 1998	17.38	17.75	15.00	15.50
441	NASDAQ	CERS	Tue, Nov 3, 1998	17.75	18.00	17.50	17.63
440	NASDAQ	CERS	Mon, Nov 2, 1998	17.88	18.50	17.88	18.25
439	NASDAQ	CERS	Fri, Oct 30, 1998	17.50	18.75	17.50	18.75
438	NASDAQ	CERS	Thu, Oct 29, 1998	17.50	17.75	17.50	17.75
437	NASDAQ	CERS	Wed, Oct 28, 1998	16.63	17.50	16.63	17.50
436	NASDAQ	CERS	Tue, Oct 27, 1998	15.50	17.50	15.50	17.38
435	NASDAQ	CERS	Mon, Oct 26, 1998	15.38	15.88	15.38	15.88
434	NASDAQ	CERS	Fri, Oct 23, 1998	15.38	15.75	15.25	15.25
433	NASDAQ	CERS	Thu, Oct 22, 1998	15.50	15.50	15.50	15.50
432	NASDAQ	CERS	Wed, Oct 21, 1998	14.25	15.50	14.00	15.50
431	NASDAQ	CERS	Tue, Oct 20, 1998	14.00	14.88	14.00	14.00
430	NASDAQ	CERS	Mon, Oct 19, 1998	14.38	14.38	14.00	14.00
429	NASDAQ	CERS	Fri, Oct 16, 1998	13.25	14.00	13.25	13.50
428	NASDAQ	CERS	Thu, Oct 15, 1998	13.00	13.25	13.00	13.00
427	NASDAQ	CERS	Wed, Oct 14, 1998	12.75	14.25	12.38	13.25
426	NASDAQ	CERS	Tue, Oct 13, 1998	12.38	12.50	12.38	12.38
425	NASDAQ	CERS	Mon, Oct 12, 1998	11.75	13.50	11.75	12.88
424	NASDAQ	CERS	Fri, Oct 9, 1998	11.75	12.25	11.25	12.25
423	NASDAQ	CERS	Thu, Oct 8, 1998	12.25	12.25	11.63	12.00
422	NASDAQ	CERS	Wed, Oct 7, 1998	13.25	13.75	12.75	12.88
421	NASDAQ	CERS	Tue, Oct 6, 1998	13.25	14.00	13.25	14.00
420	NASDAQ	CERS	Mon, Oct 5, 1998	14.50	14.50	13.25	14.44
419	NASDAQ	CERS	Fri, Oct 2, 1998	13.75	14.94	13.75	14.94
418	NASDAQ	CERS	Thu, Oct 1, 1998	14.50	15.00	13.75	15.00
417	NASDAQ	CERS	Wed, Sep 30, 1998	15.00	15.81	14.50	15.25
416	NASDAQ	CERS	Tue, Sep 29, 1998	15.25	15.44	15.00	15.38
415	NASDAQ	CERS	Mon, Sep 28, 1998	15.13	16.00	15.13	16.00
414	NASDAQ	CERS	Fri, Sep 25, 1998	15.56	15.56	15.50	15.50
413	NASDAQ	CERS	Thu, Sep 24, 1998	16.00	16.00	16.00	16.00
412	NASDAQ	CERS	Wed, Sep 23, 1998	15.50	16.06	15.50	16.00
411	NASDAQ	CERS	Tue, Sep 22, 1998	14.50	15.50	14.50	15.50
410	NASDAQ	CERS	Mon, Sep 21, 1998	15.25	15.25	14.13	15.25
409	NASDAQ	CERS	Fri, Sep 18, 1998	15.00	15.00	15.00	15.00
408	NASDAQ	CERS	Thu, Sep 17, 1998	14.50	15.00	14.50	15.00
407	NASDAQ	CERS	Wed, Sep 16, 1998	15.00	15.00	14.25	14.25
406	NASDAQ	CERS	Tue, Sep 15, 1998	14.63	15.13	14.00	15.13
405	NASDAQ	CERS	Mon, Sep 14, 1998	14.63	14.63	14.00	14.50
404	NASDAQ	CERS	Fri, Sep 11, 1998	14.00	14.00	13.50	13.63
403	NASDAQ	CERS	Thu, Sep 10, 1998	15.00	15.06	14.25	14.25
402	NASDAQ	CERS	Wed, Sep 9, 1998	15.13	15.13	15.00	15.00
401	NASDAQ	CERS	Tue, Sep 8, 1998	15.53	16.00	15.00	15.00
400	NASDAQ	CERS	Fri, Sep 4, 1998	14.88	15.25	14.88	14.88
399	NASDAQ	CERS	Thu, Sep 3, 1998	15.50	15.50	14.00	15.00
398	NASDAQ	CERS	Wed, Sep 2, 1998	15.25	15.25	14.50	15.00
397	NASDAQ	CERS	Tue, Sep 1, 1998	14.38	14.75	13.25	13.88
396	NASDAQ	CERS	Mon, Aug 31, 1998	17.88	17.88	13.50	14.00
395	NASDAQ	CERS	Fri, Aug 28, 1998	18.25	18.25	16.00	17.00
394	NASDAQ	CERS	Thu, Aug 27, 1998	17.38	17.88	16.50	16.56
393	NASDAQ	CERS	Wed, Aug 26, 1998	18.25	18.25	17.50	18.25
392	NASDAQ	CERS	Tue, Aug 25, 1998	18.69	19.25	18.44	18.50
391	NASDAQ	CERS	Mon, Aug 24, 1998	16.88	18.94	16.88	18.94
390	NASDAQ	CERS	Fri, Aug 21, 1998	17.25	17.50	17.00	17.00
389	NASDAQ	CERS	Thu, Aug 20, 1998	18.00	18.13	17.25	17.25
388	NASDAQ	CERS	Wed, Aug 19, 1998	18.75	19.00	18.00	18.44
387	NASDAQ	CERS	Tue, Aug 18, 1998	17.25	19.00	17.00	18.75
386	NASDAQ	CERS	Mon, Aug 17, 1998	16.88	17.06	16.88	17.06
385	NASDAQ	CERS	Fri, Aug 14, 1998	17.75	17.75	17.75	17.75
384	NASDAQ	CERS	Thu, Aug 13, 1998	17.75	17.75	17.13	17.38
383	NASDAQ	CERS	Wed, Aug 12, 1998	16.75	17.50	16.75	17.00
382	NASDAQ	CERS	Tue, Aug 11, 1998	15.38	17.50	15.38	16.75
381	NASDAQ	CERS	Mon, Aug 10, 1998	17.50	17.50	16.75	16.75
380	NASDAQ	CERS	Fri, Aug 7, 1998	17.00	17.50	16.50	17.06
379	NASDAQ	CERS	Thu, Aug 6, 1998	17.50	17.50	17.00	17.25
378	NASDAQ	CERS	Wed, Aug 5, 1998	17.50	17.50	16.25	17.50
377	NASDAQ	CERS	Tue, Aug 4, 1998	18.00	18.00	16.75	17.25
376	NASDAQ	CERS	Mon, Aug 3, 1998	19.25	19.25	18.00	18.50
375	NASDAQ	CERS	Fri, Jul 31, 1998	20.00	20.00	18.25	18.25
374	NASDAQ	CERS	Thu, Jul 30, 1998	20.00	20.75	20.00	20.75
373	NASDAQ	CERS	Wed, Jul 29, 1998	21.25	21.25	20.00	21.00
372	NASDAQ	CERS	Tue, Jul 28, 1998	20.00	20.75	19.75	20.25
371	NASDAQ	CERS	Mon, Jul 27, 1998	20.88	21.50	20.00	20.00
370	NASDAQ	CERS	Fri, Jul 24, 1998	20.00	21.00	20.00	21.00
369	NASDAQ	CERS	Thu, Jul 23, 1998	21.50	21.50	20.25	20.50
368	NASDAQ	CERS	Wed, Jul 22, 1998	22.13	22.13	20.00	21.00
367	NASDAQ	CERS	Tue, Jul 21, 1998	21.25	22.38	20.38	22.13
366	NASDAQ	CERS	Mon, Jul 20, 1998	23.25	23.25	20.75	20.75
365	NASDAQ	CERS	Fri, Jul 17, 1998	23.75	25.00	22.75	23.38
364	NASDAQ	CERS	Thu, Jul 16, 1998	21.75	24.63	21.75	23.75
363	NASDAQ	CERS	Wed, Jul 15, 1998	20.50	21.94	19.63	21.88
362	NASDAQ	CERS	Tue, Jul 14, 1998	19.50	21.00	19.00	19.75
361	NASDAQ	CERS	Mon, Jul 13, 1998	18.75	19.00	18.25	19.00
360	NASDAQ	CERS	Fri, Jul 10, 1998	18.00	18.75	17.88	18.50
359	NASDAQ	CERS	Thu, Jul 9, 1998	16.00	18.38	16.00	17.50
358	NASDAQ	CERS	Wed, Jul 8, 1998	16.00	16.00	15.25	15.94
357	NASDAQ	CERS	Tue, Jul 7, 1998	14.75	15.88	14.75	15.25
356	NASDAQ	CERS	Mon, Jul 6, 1998	14.75	14.75	13.75	14.63
355	NASDAQ	CERS	Thu, Jul 2, 1998	14.38	14.75	14.00	14.75
354	NASDAQ	CERS	Wed, Jul 1, 1998	13.50	14.25	13.50	14.25
353	NASDAQ	CERS	Tue, Jun 30, 1998	13.25	14.00	12.50	14.00
352	NASDAQ	CERS	Mon, Jun 29, 1998	13.25	13.25	12.75	13.00
351	NASDAQ	CERS	Fri, Jun 26, 1998	13.13	13.25	13.00	13.00
350	NASDAQ	CERS	Thu, Jun 25, 1998	12.75	13.25	12.75	13.25
349	NASDAQ	CERS	Wed, Jun 24, 1998	13.75	13.88	12.75	13.19
348	NASDAQ	CERS	Tue, Jun 23, 1998	14.13	14.13	13.63	13.88
347	NASDAQ	CERS	Mon, Jun 22, 1998	13.63	13.88	13.63	13.63
346	NASDAQ	CERS	Fri, Jun 19, 1998	13.88	14.13	13.88	14.06
345	NASDAQ	CERS	Thu, Jun 18, 1998	13.88	14.00	13.88	13.88
344	NASDAQ	CERS	Wed, Jun 17, 1998	14.00	14.00	13.75	14.00
343	NASDAQ	CERS	Tue, Jun 16, 1998	13.50	14.00	13.50	13.63
342	NASDAQ	CERS	Mon, Jun 15, 1998	13.88	13.88	13.38	13.38
341	NASDAQ	CERS	Fri, Jun 12, 1998	14.13	14.13	13.88	14.00
340	NASDAQ	CERS	Thu, Jun 11, 1998	14.88	14.88	14.00	14.13
339	NASDAQ	CERS	Wed, Jun 10, 1998	14.88	14.88	14.88	14.88
338	NASDAQ	CERS	Tue, Jun 9, 1998	15.38	15.38	14.63	15.13
337	NASDAQ	CERS	Mon, Jun 8, 1998	15.00	15.25	14.63	15.13
336	NASDAQ	CERS	Fri, Jun 5, 1998	15.25	15.25	15.13	15.25
335	NASDAQ	CERS	Thu, Jun 4, 1998	15.00	15.13	15.00	15.00
334	NASDAQ	CERS	Wed, Jun 3, 1998	15.63	15.63	14.75	15.38
333	NASDAQ	CERS	Tue, Jun 2, 1998	15.38	15.63	15.00	15.00
332	NASDAQ	CERS	Mon, Jun 1, 1998	15.00	15.63	15.00	15.63
331	NASDAQ	CERS	Fri, May 29, 1998	15.00	15.88	15.00	15.50
330	NASDAQ	CERS	Thu, May 28, 1998	15.38	16.00	15.00	15.50
329	NASDAQ	CERS	Wed, May 27, 1998	15.00	15.88	15.00	15.50
328	NASDAQ	CERS	Tue, May 26, 1998	16.75	16.75	15.75	15.75
327	NASDAQ	CERS	Fri, May 22, 1998	15.88	16.38	15.75	16.25
326	NASDAQ	CERS	Thu, May 21, 1998	15.25	15.88	15.25	15.63
325	NASDAQ	CERS	Wed, May 20, 1998	15.25	15.50	15.25	15.25
324	NASDAQ	CERS	Tue, May 19, 1998	15.13	15.38	15.00	15.25
323	NASDAQ	CERS	Mon, May 18, 1998	15.00	15.25	15.00	15.00
322	NASDAQ	CERS	Fri, May 15, 1998	14.75	15.13	14.75	15.13
321	NASDAQ	CERS	Thu, May 14, 1998	15.13	15.13	14.88	15.00
320	NASDAQ	CERS	Wed, May 13, 1998	14.00	15.13	13.94	15.13
319	NASDAQ	CERS	Tue, May 12, 1998	13.63	13.88	13.63	13.88
318	NASDAQ	CERS	Mon, May 11, 1998	13.50	14.00	13.13	13.63
317	NASDAQ	CERS	Fri, May 8, 1998	13.63	13.88	13.38	13.63
316	NASDAQ	CERS	Thu, May 7, 1998	13.88	14.00	13.50	13.50
315	NASDAQ	CERS	Wed, May 6, 1998	13.75	13.88	13.00	13.88
314	NASDAQ	CERS	Tue, May 5, 1998	13.75	13.75	13.00	13.50
313	NASDAQ	CERS	Mon, May 4, 1998	13.25	13.75	12.75	13.38
312	NASDAQ	CERS	Fri, May 1, 1998	13.00	13.00	12.50	13.00
311	NASDAQ	CERS	Thu, Apr 30, 1998	12.75	13.00	12.25	12.50
310	NASDAQ	CERS	Wed, Apr 29, 1998	12.50	12.75	12.50	12.75
309	NASDAQ	CERS	Tue, Apr 28, 1998	12.75	12.75	12.63	12.63
308	NASDAQ	CERS	Mon, Apr 27, 1998	12.75	12.75	12.13	12.25
307	NASDAQ	CERS	Fri, Apr 24, 1998	12.63	12.69	12.38	12.63
306	NASDAQ	CERS	Thu, Apr 23, 1998	12.00	12.88	12.00	12.50
305	NASDAQ	CERS	Wed, Apr 22, 1998	13.25	13.25	12.00	12.00
304	NASDAQ	CERS	Tue, Apr 21, 1998	14.00	14.00	13.38	13.63
303	NASDAQ	CERS	Mon, Apr 20, 1998	14.00	14.00	13.75	13.94
302	NASDAQ	CERS	Fri, Apr 17, 1998	14.00	14.00	13.50	13.75
301	NASDAQ	CERS	Thu, Apr 16, 1998	13.81	14.13	13.50	13.50
300	NASDAQ	CERS	Wed, Apr 15, 1998	14.25	14.88	13.75	13.75
299	NASDAQ	CERS	Tue, Apr 14, 1998	14.75	15.00	14.31	14.31
298	NASDAQ	CERS	Mon, Apr 13, 1998	14.75	15.13	14.75	14.81
297	NASDAQ	CERS	Thu, Apr 9, 1998	15.00	15.25	14.75	15.00
296	NASDAQ	CERS	Wed, Apr 8, 1998	15.16	15.16	14.88	15.00
295	NASDAQ	CERS	Tue, Apr 7, 1998	15.13	15.50	14.75	15.00
294	NASDAQ	CERS	Mon, Apr 6, 1998	16.13	16.13	15.13	15.50
293	NASDAQ	CERS	Fri, Apr 3, 1998	15.88	16.50	15.88	15.88
292	NASDAQ	CERS	Thu, Apr 2, 1998	16.00	16.88	16.00	16.50
291	NASDAQ	CERS	Wed, Apr 1, 1998	16.50	16.50	16.00	16.00
290	NASDAQ	CERS	Tue, Mar 31, 1998	17.00	17.00	16.25	16.50
289	NASDAQ	CERS	Mon, Mar 30, 1998	17.00	17.00	16.75	16.75
288	NASDAQ	CERS	Fri, Mar 27, 1998	16.75	17.25	16.75	17.13
287	NASDAQ	CERS	Thu, Mar 26, 1998	17.50	17.50	16.75	17.13
286	NASDAQ	CERS	Wed, Mar 25, 1998	16.75	17.00	16.75	17.00
285	NASDAQ	CERS	Tue, Mar 24, 1998	17.00	17.63	17.00	17.06
284	NASDAQ	CERS	Mon, Mar 23, 1998	17.00	17.69	16.75	16.75
283	NASDAQ	CERS	Fri, Mar 20, 1998	17.50	17.50	17.00	17.00
282	NASDAQ	CERS	Thu, Mar 19, 1998	16.75	17.25	16.75	17.25
281	NASDAQ	CERS	Wed, Mar 18, 1998	17.19	17.25	17.13	17.13
280	NASDAQ	CERS	Tue, Mar 17, 1998	17.00	17.25	16.25	17.00
279	NASDAQ	CERS	Mon, Mar 16, 1998	16.25	17.00	16.00	16.75
278	NASDAQ	CERS	Fri, Mar 13, 1998	16.00	17.00	16.00	16.38
277	NASDAQ	CERS	Thu, Mar 12, 1998	17.50	17.50	16.50	16.63
276	NASDAQ	CERS	Wed, Mar 11, 1998	16.50	16.75	16.50	16.50
275	NASDAQ	CERS	Tue, Mar 10, 1998	16.50	17.50	16.50	17.50
274	NASDAQ	CERS	Mon, Mar 9, 1998	17.75	17.75	16.75	17.50
273	NASDAQ	CERS	Fri, Mar 6, 1998	17.25	17.38	17.00	17.38
272	NASDAQ	CERS	Thu, Mar 5, 1998	17.25	17.50	16.50	17.25
271	NASDAQ	CERS	Wed, Mar 4, 1998	17.25	17.25	17.00	17.00
270	NASDAQ	CERS	Tue, Mar 3, 1998	16.25	17.25	16.25	16.75
269	NASDAQ	CERS	Mon, Mar 2, 1998	16.13	16.13	15.88	16.13
268	NASDAQ	CERS	Fri, Feb 27, 1998	15.88	16.13	15.88	16.13
267	NASDAQ	CERS	Thu, Feb 26, 1998	16.25	16.25	15.50	16.00
266	NASDAQ	CERS	Wed, Feb 25, 1998	17.25	17.25	16.50	17.00
265	NASDAQ	CERS	Tue, Feb 24, 1998	17.25	17.50	16.75	16.75
264	NASDAQ	CERS	Mon, Feb 23, 1998	18.00	18.00	17.50	17.50
263	NASDAQ	CERS	Fri, Feb 20, 1998	18.00	18.25	18.00	18.00
262	NASDAQ	CERS	Thu, Feb 19, 1998	18.75	18.75	17.88	18.50
261	NASDAQ	CERS	Wed, Feb 18, 1998	18.75	19.25	18.75	19.00
260	NASDAQ	CERS	Tue, Feb 17, 1998	19.63	19.63	19.00	19.00
259	NASDAQ	CERS	Fri, Feb 13, 1998	19.50	19.50	19.25	19.38
258	NASDAQ	CERS	Thu, Feb 12, 1998	19.50	20.25	19.38	19.38
257	NASDAQ	CERS	Wed, Feb 11, 1998	19.00	19.25	18.50	19.00
256	NASDAQ	CERS	Tue, Feb 10, 1998	18.50	19.00	18.00	18.88
255	NASDAQ	CERS	Mon, Feb 9, 1998	18.50	18.50	18.00	18.00
254	NASDAQ	CERS	Fri, Feb 6, 1998	17.50	18.00	17.50	18.00
253	NASDAQ	CERS	Thu, Feb 5, 1998	18.00	18.00	17.50	17.75
252	NASDAQ	CERS	Wed, Feb 4, 1998	17.25	17.88	17.00	17.63
251	NASDAQ	CERS	Tue, Feb 3, 1998	17.00	17.25	16.81	17.25
250	NASDAQ	CERS	Mon, Feb 2, 1998	17.25	17.25	17.00	17.00
249	NASDAQ	CERS	Fri, Jan 30, 1998	16.00	17.13	15.13	17.00
248	NASDAQ	CERS	Thu, Jan 29, 1998	16.00	16.00	14.50	15.38
247	NASDAQ	CERS	Wed, Jan 28, 1998	16.88	17.00	16.19	16.38
246	NASDAQ	CERS	Tue, Jan 27, 1998	18.13	18.13	17.75	17.94
245	NASDAQ	CERS	Mon, Jan 26, 1998	17.50	18.13	17.50	18.00
244	NASDAQ	CERS	Fri, Jan 23, 1998	18.75	18.75	17.00	17.50
243	NASDAQ	CERS	Thu, Jan 22, 1998	19.00	19.00	18.25	18.25
242	NASDAQ	CERS	Wed, Jan 21, 1998	19.00	19.00	18.13	18.25
241	NASDAQ	CERS	Tue, Jan 20, 1998	20.38	20.38	18.13	18.13
240	NASDAQ	CERS	Fri, Jan 16, 1998	20.50	20.50	19.88	19.88
239	NASDAQ	CERS	Thu, Jan 15, 1998	20.50	20.50	20.50	20.50
238	NASDAQ	CERS	Wed, Jan 14, 1998	20.31	20.31	20.31	20.31
237	NASDAQ	CERS	Tue, Jan 13, 1998	20.50	20.50	20.13	20.31
236	NASDAQ	CERS	Mon, Jan 12, 1998	20.38	20.38	19.88	20.00
235	NASDAQ	CERS	Fri, Jan 9, 1998	21.63	21.63	19.88	19.94
234	NASDAQ	CERS	Thu, Jan 8, 1998	22.00	22.00	21.63	21.63
233	NASDAQ	CERS	Wed, Jan 7, 1998	22.00	22.00	22.00	22.00
232	NASDAQ	CERS	Tue, Jan 6, 1998	22.00	22.50	22.00	22.00
231	NASDAQ	CERS	Mon, Jan 5, 1998	22.50	22.50	22.00	22.00
230	NASDAQ	CERS	Fri, Jan 2, 1998	22.00	22.50	22.00	22.00
229	NASDAQ	CERS	Tue, Dec 30, 1997	22.00	22.00	22.00	22.00
228	NASDAQ	CERS	Mon, Dec 29, 1997	22.25	22.50	22.00	22.00
227	NASDAQ	CERS	Fri, Dec 26, 1997	22.50	22.50	22.50	22.50
226	NASDAQ	CERS	Wed, Dec 24, 1997	21.50	22.00	21.50	22.00
225	NASDAQ	CERS	Tue, Dec 23, 1997	21.50	21.75	21.25	21.25
224	NASDAQ	CERS	Mon, Dec 22, 1997	22.00	22.00	21.25	21.25
223	NASDAQ	CERS	Fri, Dec 19, 1997	22.50	22.50	21.25	21.50
222	NASDAQ	CERS	Thu, Dec 18, 1997	22.50	22.50	22.25	22.25
221	NASDAQ	CERS	Wed, Dec 17, 1997	23.00	23.00	22.00	22.25
220	NASDAQ	CERS	Tue, Dec 16, 1997	23.63	24.50	23.38	23.50
219	NASDAQ	CERS	Mon, Dec 15, 1997	23.50	23.50	23.50	23.50
218	NASDAQ	CERS	Fri, Dec 12, 1997	24.38	24.38	23.50	23.88
217	NASDAQ	CERS	Thu, Dec 11, 1997	23.75	24.00	23.25	24.00
216	NASDAQ	CERS	Wed, Dec 10, 1997	25.00	25.00	23.88	24.00
215	NASDAQ	CERS	Tue, Dec 9, 1997	25.50	25.50	23.88	24.50
214	NASDAQ	CERS	Mon, Dec 8, 1997	25.13	25.13	24.00	24.50
213	NASDAQ	CERS	Fri, Dec 5, 1997	23.75	25.00	23.75	24.75
212	NASDAQ	CERS	Thu, Dec 4, 1997	23.00	24.75	23.00	24.00
211	NASDAQ	CERS	Wed, Dec 3, 1997	22.75	23.00	22.75	23.00
210	NASDAQ	CERS	Tue, Dec 2, 1997	23.25	23.25	22.56	22.75
209	NASDAQ	CERS	Mon, Dec 1, 1997	22.56	23.25	22.56	22.88
208	NASDAQ	CERS	Wed, Nov 26, 1997	23.50	23.88	23.00	23.00
207	NASDAQ	CERS	Tue, Nov 25, 1997	23.25	24.00	23.25	24.00
206	NASDAQ	CERS	Mon, Nov 24, 1997	24.00	24.00	23.25	23.25
205	NASDAQ	CERS	Fri, Nov 21, 1997	24.00	24.63	23.88	24.00
204	NASDAQ	CERS	Thu, Nov 20, 1997	23.38	23.75	22.63	23.75
203	NASDAQ	CERS	Wed, Nov 19, 1997	23.50	23.50	22.75	22.75
202	NASDAQ	CERS	Tue, Nov 18, 1997	24.00	25.38	22.75	22.75
201	NASDAQ	CERS	Mon, Nov 17, 1997	23.00	25.25	22.75	24.50
200	NASDAQ	CERS	Fri, Nov 14, 1997	22.88	23.00	22.00	23.00
199	NASDAQ	CERS	Thu, Nov 13, 1997	22.63	22.88	21.88	22.25
198	NASDAQ	CERS	Wed, Nov 12, 1997	20.75	22.25	20.75	22.25
197	NASDAQ	CERS	Tue, Nov 11, 1997	21.75	21.75	21.25	21.38
196	NASDAQ	CERS	Mon, Nov 10, 1997	22.00	22.50	21.75	22.00
195	NASDAQ	CERS	Fri, Nov 7, 1997	21.00	21.88	20.00	21.88
194	NASDAQ	CERS	Thu, Nov 6, 1997	21.25	21.75	21.25	21.75
193	NASDAQ	CERS	Wed, Nov 5, 1997	22.00	22.25	21.25	21.75
192	NASDAQ	CERS	Tue, Nov 4, 1997	21.00	22.00	21.00	21.50
191	NASDAQ	CERS	Mon, Nov 3, 1997	21.00	21.75	20.88	21.00
190	NASDAQ	CERS	Fri, Oct 31, 1997	21.75	21.75	20.88	21.00
189	NASDAQ	CERS	Thu, Oct 30, 1997	21.25	21.75	21.00	21.13
188	NASDAQ	CERS	Wed, Oct 29, 1997	22.13	22.75	21.75	21.75
187	NASDAQ	CERS	Tue, Oct 28, 1997	19.25	22.75	19.13	22.19
186	NASDAQ	CERS	Mon, Oct 27, 1997	21.50	21.75	21.13	21.25
185	NASDAQ	CERS	Fri, Oct 24, 1997	22.00	22.25	21.25	21.75
184	NASDAQ	CERS	Thu, Oct 23, 1997	21.50	22.50	20.50	21.50
183	NASDAQ	CERS	Wed, Oct 22, 1997	23.75	23.75	22.00	22.38
182	NASDAQ	CERS	Tue, Oct 21, 1997	20.38	21.75	20.00	21.63
181	NASDAQ	CERS	Mon, Oct 20, 1997	19.00	20.13	18.25	20.13
180	NASDAQ	CERS	Fri, Oct 17, 1997	21.25	21.25	17.50	19.00
179	NASDAQ	CERS	Thu, Oct 16, 1997	20.50	21.00	20.00	20.63
178	NASDAQ	CERS	Wed, Oct 15, 1997	20.50	21.00	20.38	20.81
177	NASDAQ	CERS	Tue, Oct 14, 1997	21.75	21.75	20.75	20.88
176	NASDAQ	CERS	Mon, Oct 13, 1997	21.13	22.88	20.75	21.50
175	NASDAQ	CERS	Fri, Oct 10, 1997	18.25	20.38	18.25	20.25
174	NASDAQ	CERS	Thu, Oct 9, 1997	18.00	18.25	17.75	18.25
173	NASDAQ	CERS	Wed, Oct 8, 1997	18.13	18.25	17.50	17.75
172	NASDAQ	CERS	Tue, Oct 7, 1997	17.00	17.38	17.00	17.38
171	NASDAQ	CERS	Mon, Oct 6, 1997	17.38	17.50	16.88	17.00
170	NASDAQ	CERS	Fri, Oct 3, 1997	17.75	17.75	17.38	17.50
169	NASDAQ	CERS	Thu, Oct 2, 1997	17.38	17.63	17.38	17.63
168	NASDAQ	CERS	Wed, Oct 1, 1997	17.38	17.63	17.38	17.50
167	NASDAQ	CERS	Tue, Sep 30, 1997	17.50	17.63	17.38	17.38
166	NASDAQ	CERS	Mon, Sep 29, 1997	17.38	17.75	17.38	17.63
165	NASDAQ	CERS	Fri, Sep 26, 1997	17.75	17.75	17.38	17.38
164	NASDAQ	CERS	Thu, Sep 25, 1997	17.75	17.75	17.25	17.75
163	NASDAQ	CERS	Wed, Sep 24, 1997	17.25	17.75	17.25	17.75
162	NASDAQ	CERS	Tue, Sep 23, 1997	17.25	17.50	17.25	17.38
161	NASDAQ	CERS	Mon, Sep 22, 1997	17.50	17.50	17.25	17.25
160	NASDAQ	CERS	Fri, Sep 19, 1997	17.63	17.75	17.25	17.25
159	NASDAQ	CERS	Thu, Sep 18, 1997	17.13	17.63	17.13	17.13
158	NASDAQ	CERS	Wed, Sep 17, 1997	17.75	17.75	17.13	17.13
157	NASDAQ	CERS	Tue, Sep 16, 1997	17.63	17.75	17.13	17.25
156	NASDAQ	CERS	Mon, Sep 15, 1997	17.44	17.75	17.13	17.13
155	NASDAQ	CERS	Fri, Sep 12, 1997	17.75	17.75	17.13	17.38
154	NASDAQ	CERS	Thu, Sep 11, 1997	17.25	17.75	17.13	17.13
153	NASDAQ	CERS	Wed, Sep 10, 1997	17.13	17.63	17.13	17.25
152	NASDAQ	CERS	Tue, Sep 9, 1997	17.88	17.88	17.13	17.13
151	NASDAQ	CERS	Mon, Sep 8, 1997	17.75	18.00	17.25	17.50
150	NASDAQ	CERS	Fri, Sep 5, 1997	17.75	18.00	17.75	18.00
149	NASDAQ	CERS	Thu, Sep 4, 1997	18.13	18.13	17.75	17.75
148	NASDAQ	CERS	Wed, Sep 3, 1997	17.25	18.13	17.13	17.94
147	NASDAQ	CERS	Tue, Sep 2, 1997	17.00	17.13	16.75	17.00
146	NASDAQ	CERS	Fri, Aug 29, 1997	17.00	17.00	16.63	16.69
145	NASDAQ	CERS	Thu, Aug 28, 1997	17.00	17.00	16.63	16.88
144	NASDAQ	CERS	Wed, Aug 27, 1997	16.63	17.13	16.63	16.63
143	NASDAQ	CERS	Tue, Aug 26, 1997	16.63	17.13	16.63	16.63
142	NASDAQ	CERS	Mon, Aug 25, 1997	17.00	17.00	16.75	17.00
141	NASDAQ	CERS	Fri, Aug 22, 1997	17.00	17.00	16.13	16.75
140	NASDAQ	CERS	Thu, Aug 21, 1997	16.75	17.13	16.13	16.63
139	NASDAQ	CERS	Wed, Aug 20, 1997	17.00	17.00	16.13	16.13
138	NASDAQ	CERS	Tue, Aug 19, 1997	15.75	17.00	15.75	17.00
137	NASDAQ	CERS	Mon, Aug 18, 1997	16.25	16.50	15.50	16.00
136	NASDAQ	CERS	Fri, Aug 15, 1997	15.63	16.25	15.63	16.25
135	NASDAQ	CERS	Thu, Aug 14, 1997	16.38	16.50	15.50	15.75
134	NASDAQ	CERS	Wed, Aug 13, 1997	16.38	16.50	15.50	16.00
133	NASDAQ	CERS	Tue, Aug 12, 1997	15.88	16.50	15.75	15.75
132	NASDAQ	CERS	Mon, Aug 11, 1997	16.50	16.50	15.75	16.38
131	NASDAQ	CERS	Fri, Aug 8, 1997	16.13	16.50	15.25	16.50
130	NASDAQ	CERS	Thu, Aug 7, 1997	17.25	17.75	15.88	15.88
129	NASDAQ	CERS	Wed, Aug 6, 1997	15.63	17.50	15.38	16.50
128	NASDAQ	CERS	Tue, Aug 5, 1997	14.63	15.63	14.50	15.50
127	NASDAQ	CERS	Mon, Aug 4, 1997	14.00	14.00	13.50	14.00
126	NASDAQ	CERS	Fri, Aug 1, 1997	13.50	14.00	13.50	14.00
125	NASDAQ	CERS	Thu, Jul 31, 1997	13.63	14.00	13.25	14.00
124	NASDAQ	CERS	Wed, Jul 30, 1997	14.63	14.63	12.88	13.44
123	NASDAQ	CERS	Tue, Jul 29, 1997	14.75	15.13	13.88	14.50
122	NASDAQ	CERS	Mon, Jul 28, 1997	15.25	15.25	14.75	14.75
121	NASDAQ	CERS	Fri, Jul 25, 1997	15.75	15.75	14.88	15.13
120	NASDAQ	CERS	Thu, Jul 24, 1997	15.63	15.75	15.00	15.75
119	NASDAQ	CERS	Wed, Jul 23, 1997	15.88	16.00	15.00	15.63
118	NASDAQ	CERS	Tue, Jul 22, 1997	15.00	15.88	14.50	15.75
117	NASDAQ	CERS	Mon, Jul 21, 1997	14.00	15.00	14.00	15.00
116	NASDAQ	CERS	Fri, Jul 18, 1997	14.75	15.38	13.88	14.75
115	NASDAQ	CERS	Thu, Jul 17, 1997	14.38	15.25	13.63	14.75
114	NASDAQ	CERS	Wed, Jul 16, 1997	12.25	14.88	12.25	13.63
113	NASDAQ	CERS	Tue, Jul 15, 1997	11.63	12.75	11.63	12.75
112	NASDAQ	CERS	Mon, Jul 14, 1997	11.63	12.00	11.13	12.00
111	NASDAQ	CERS	Fri, Jul 11, 1997	11.50	11.75	11.13	11.75
110	NASDAQ	CERS	Thu, Jul 10, 1997	11.50	11.50	10.81	11.50
109	NASDAQ	CERS	Wed, Jul 9, 1997	10.88	11.50	10.38	11.50
108	NASDAQ	CERS	Tue, Jul 8, 1997	10.63	10.88	10.00	10.25
107	NASDAQ	CERS	Mon, Jul 7, 1997	9.88	11.13	9.88	10.25
106	NASDAQ	CERS	Thu, Jul 3, 1997	9.88	10.38	9.88	10.38
105	NASDAQ	CERS	Wed, Jul 2, 1997	8.75	9.88	8.13	9.88
104	NASDAQ	CERS	Tue, Jul 1, 1997	9.25	9.25	8.00	8.00
103	NASDAQ	CERS	Mon, Jun 30, 1997	10.25	10.25	8.50	9.25
102	NASDAQ	CERS	Fri, Jun 27, 1997	10.63	10.75	9.56	9.88
101	NASDAQ	CERS	Thu, Jun 26, 1997	11.00	11.00	10.75	10.75
100	NASDAQ	CERS	Wed, Jun 25, 1997	11.13	11.38	10.75	10.75
99	NASDAQ	CERS	Tue, Jun 24, 1997	11.50	11.50	11.13	11.13
98	NASDAQ	CERS	Mon, Jun 23, 1997	11.50	11.50	11.13	11.13
97	NASDAQ	CERS	Fri, Jun 20, 1997	11.50	11.50	11.50	11.50
96	NASDAQ	CERS	Thu, Jun 19, 1997	11.50	11.50	11.00	11.00
95	NASDAQ	CERS	Wed, Jun 18, 1997	11.00	11.50	11.00	11.00
94	NASDAQ	CERS	Tue, Jun 17, 1997	11.75	11.75	11.13	11.13
93	NASDAQ	CERS	Mon, Jun 16, 1997	11.50	11.50	11.25	11.25
92	NASDAQ	CERS	Fri, Jun 13, 1997	11.25	11.63	11.25	11.50
91	NASDAQ	CERS	Thu, Jun 12, 1997	11.25	11.63	11.25	11.63
90	NASDAQ	CERS	Wed, Jun 11, 1997	10.88	11.63	10.88	11.25
89	NASDAQ	CERS	Tue, Jun 10, 1997	11.50	11.50	10.88	10.88
88	NASDAQ	CERS	Mon, Jun 9, 1997	11.00	11.00	11.00	11.00
87	NASDAQ	CERS	Fri, Jun 6, 1997	11.00	11.50	11.00	11.25
86	NASDAQ	CERS	Thu, Jun 5, 1997	11.38	11.50	11.25	11.38
85	NASDAQ	CERS	Wed, Jun 4, 1997	11.75	11.75	11.00	11.25
84	NASDAQ	CERS	Tue, Jun 3, 1997	11.13	11.75	11.13	11.13
83	NASDAQ	CERS	Mon, Jun 2, 1997	11.38	11.75	11.38	11.75
82	NASDAQ	CERS	Fri, May 30, 1997	11.75	12.00	11.63	11.88
81	NASDAQ	CERS	Thu, May 29, 1997	12.50	12.50	11.75	11.75
80	NASDAQ	CERS	Wed, May 28, 1997	12.00	12.00	12.00	12.00
79	NASDAQ	CERS	Tue, May 27, 1997	12.25	12.38	11.75	12.00
78	NASDAQ	CERS	Fri, May 23, 1997	12.25	12.25	11.75	12.13
77	NASDAQ	CERS	Thu, May 22, 1997	11.75	12.13	11.63	11.63
76	NASDAQ	CERS	Wed, May 21, 1997	11.25	11.50	11.00	11.50
75	NASDAQ	CERS	Tue, May 20, 1997	11.25	11.25	11.25	11.25
74	NASDAQ	CERS	Mon, May 19, 1997	11.25	11.25	11.00	11.13
73	NASDAQ	CERS	Fri, May 16, 1997	10.75	11.25	10.75	11.00
72	NASDAQ	CERS	Thu, May 15, 1997	11.13	11.13	10.75	10.75
71	NASDAQ	CERS	Wed, May 14, 1997	11.25	11.25	10.75	10.88
70	NASDAQ	CERS	Tue, May 13, 1997	11.13	11.13	10.75	11.13
69	NASDAQ	CERS	Mon, May 12, 1997	11.13	11.13	10.75	10.75
68	NASDAQ	CERS	Fri, May 9, 1997	11.00	11.13	10.88	11.13
67	NASDAQ	CERS	Thu, May 8, 1997	11.00	11.38	10.25	11.00
66	NASDAQ	CERS	Wed, May 7, 1997	12.25	12.25	11.00	11.00
65	NASDAQ	CERS	Tue, May 6, 1997	11.88	12.25	11.88	11.88
64	NASDAQ	CERS	Mon, May 5, 1997	11.38	12.25	11.00	12.00
63	NASDAQ	CERS	Fri, May 2, 1997	11.00	11.25	11.00	11.25
62	NASDAQ	CERS	Thu, May 1, 1997	11.00	11.25	11.00	11.25
61	NASDAQ	CERS	Wed, Apr 30, 1997	11.13	11.25	11.13	11.25
60	NASDAQ	CERS	Tue, Apr 29, 1997	10.88	11.25	10.88	10.88
59	NASDAQ	CERS	Mon, Apr 28, 1997	10.88	11.25	10.88	11.25
58	NASDAQ	CERS	Fri, Apr 25, 1997	10.88	11.25	10.88	10.88
57	NASDAQ	CERS	Thu, Apr 24, 1997	10.88	11.25	10.75	10.88
56	NASDAQ	CERS	Wed, Apr 23, 1997	10.88	11.25	10.88	11.25
55	NASDAQ	CERS	Mon, Apr 21, 1997	11.25	11.38	11.00	11.13
54	NASDAQ	CERS	Fri, Apr 18, 1997	11.00	11.00	10.88	10.88
53	NASDAQ	CERS	Thu, Apr 17, 1997	11.63	11.75	11.13	11.13
52	NASDAQ	CERS	Wed, Apr 16, 1997	11.63	11.63	11.50	11.50
51	NASDAQ	CERS	Tue, Apr 15, 1997	11.50	12.00	11.50	11.63
50	NASDAQ	CERS	Mon, Apr 14, 1997	12.50	12.50	11.50	11.88
49	NASDAQ	CERS	Fri, Apr 11, 1997	11.88	12.50	11.88	12.25
48	NASDAQ	CERS	Thu, Apr 10, 1997	11.50	12.25	11.38	12.00
47	NASDAQ	CERS	Wed, Apr 9, 1997	12.00	12.75	11.88	11.88
46	NASDAQ	CERS	Tue, Apr 8, 1997	11.50	12.00	11.25	12.00
45	NASDAQ	CERS	Mon, Apr 7, 1997	11.25	11.50	11.00	11.13
44	NASDAQ	CERS	Fri, Apr 4, 1997	10.88	11.25	10.88	11.13
43	NASDAQ	CERS	Thu, Apr 3, 1997	11.13	11.13	10.88	10.94
42	NASDAQ	CERS	Wed, Apr 2, 1997	10.88	11.13	10.75	10.75
41	NASDAQ	CERS	Tue, Apr 1, 1997	10.88	11.00	10.88	10.88
40	NASDAQ	CERS	Mon, Mar 31, 1997	11.25	11.25	10.88	10.88
39	NASDAQ	CERS	Thu, Mar 27, 1997	11.13	11.63	11.00	11.13
38	NASDAQ	CERS	Wed, Mar 26, 1997	10.25	11.25	10.00	11.02
37	NASDAQ	CERS	Tue, Mar 25, 1997	9.88	10.13	9.63	9.88
36	NASDAQ	CERS	Mon, Mar 24, 1997	9.75	9.88	9.38	9.88
35	NASDAQ	CERS	Fri, Mar 21, 1997	9.25	9.75	9.25	9.38
34	NASDAQ	CERS	Thu, Mar 20, 1997	10.00	10.00	9.25	9.50
33	NASDAQ	CERS	Wed, Mar 19, 1997	9.75	10.00	9.75	9.75
32	NASDAQ	CERS	Tue, Mar 18, 1997	10.50	10.63	9.75	9.88
31	NASDAQ	CERS	Mon, Mar 17, 1997	10.63	10.75	10.50	10.63
30	NASDAQ	CERS	Fri, Mar 14, 1997	11.63	11.63	10.63	10.88
29	NASDAQ	CERS	Thu, Mar 13, 1997	11.75	11.75	11.38	11.38
28	NASDAQ	CERS	Wed, Mar 12, 1997	11.63	11.88	11.38	11.50
27	NASDAQ	CERS	Tue, Mar 11, 1997	11.25	11.63	11.00	11.63
26	NASDAQ	CERS	Mon, Mar 10, 1997	9.75	11.13	9.75	10.63
25	NASDAQ	CERS	Fri, Mar 7, 1997	9.75	9.75	9.38	9.38
24	NASDAQ	CERS	Thu, Mar 6, 1997	9.13	9.50	9.13	9.38
23	NASDAQ	CERS	Wed, Mar 5, 1997	9.50	9.75	9.13	9.50
22	NASDAQ	CERS	Tue, Mar 4, 1997	9.50	10.00	9.50	9.69
21	NASDAQ	CERS	Mon, Mar 3, 1997	10.13	10.13	9.50	9.50
20	NASDAQ	CERS	Fri, Feb 28, 1997	11.00	11.00	9.88	9.88
19	NASDAQ	CERS	Thu, Feb 27, 1997	11.38	11.38	10.88	10.88
18	NASDAQ	CERS	Wed, Feb 26, 1997	11.50	11.63	10.88	11.38
17	NASDAQ	CERS	Tue, Feb 25, 1997	9.63	11.38	9.38	11.13
16	NASDAQ	CERS	Mon, Feb 24, 1997	8.25	8.44	8.00	8.38
15	NASDAQ	CERS	Fri, Feb 21, 1997	7.75	8.25	7.75	7.88
14	NASDAQ	CERS	Thu, Feb 20, 1997	8.50	8.50	7.75	7.75
13	NASDAQ	CERS	Wed, Feb 19, 1997	9.13	9.13	8.25	8.25
12	NASDAQ	CERS	Tue, Feb 18, 1997	9.13	9.25	9.13	9.13
11	NASDAQ	CERS	Fri, Feb 14, 1997	10.38	10.50	9.13	9.13
10	NASDAQ	CERS	Thu, Feb 13, 1997	10.50	10.50	10.38	10.50
9	NASDAQ	CERS	Wed, Feb 12, 1997	10.50	10.50	10.00	10.44
8	NASDAQ	CERS	Tue, Feb 11, 1997	11.50	11.75	9.88	10.13
7	NASDAQ	CERS	Mon, Feb 10, 1997	11.50	11.88	11.50	11.50
6	NASDAQ	CERS	Fri, Feb 7, 1997	12.00	12.13	10.63	11.75
5	NASDAQ	CERS	Thu, Feb 6, 1997	12.00	12.25	12.00	12.00
4	NASDAQ	CERS	Wed, Feb 5, 1997	12.00	12.38	12.00	12.00
3	NASDAQ	CERS	Tue, Feb 4, 1997	12.25	12.38	12.00	12.00
2	NASDAQ	CERS	Mon, Feb 3, 1997	12.38	12.38	12.13	12.25
1	NASDAQ	CERS	Fri, Jan 31, 1997	12.25	12.38	12.00	12.13
#	Exchange	Symbol	Date	Open	High	Low	Close

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