**Table 1:** Characteristics of the selected images from 1996 to 2001. The MDI day (first column), date (second column), and UT time are given for the magnetograms ( $t_{\rm mag}$ , third column) and their corresponding averaged intensities ( $t_{\rm int}$ , fourth column).
MDI day	Date	$t_{\rm mag}$	$t_{\rm int}$	MDI day	Date	$t_{\rm mag}$	$t_{\rm int}$
		(UT)	(UT)			(UT)	(UT)
1237	22/05/96	00:00	00:32	2225	04/02/99	03:11	03:11
1239	24/05/96	00:04*	01:18	2227	06/02/99	04:47	04:47
1249	03/06/96	12:48	12:44	2229	08/02/99	14:23	14:23
1296	20/07/96	22:28*	22:28	2292	12/04/99	11:12	10:31
1299	23/07/96	01:40*	01:40	2380	09/07/99	17:35	17:32
1313	06/08/96	16:00	16:02	2413	11/08/99	09:35	09:35
1389	21/10/96	19:11	19:12	2514	20/11/99	04:48	04:22
1407	08/11/96	19:12	18:56	2528	04/12/99	11:11	11:11
1416	17/11/96	11:15*	11:14	2529	05/12/99	11:11	11:11
1420	21/11/96	01:39*	01:27	2530	06/12/99	09:35	09:35
1502	11/02/97	06:27*	06:26	2583	28/01/00	17:35	17:27
1509	18/02/97	14:27*	14:26	2594	08/02/00	21:32	21:33
1529	10/03/97	17:36	17:19	2652	06/04/00	17:35	17:12
1538	19/03/97	00:00	00:08	2684	08/05/00	20:47	20:47
1572	22/04/97	11:16*	11:16	2693	17/05/00	20:48	21:01
1614	03/06/97	11:16*	11:16	2750	13/07/00	22:24	22:41
1701	29/08/97	03:15*	03:14	2751	14/07/00	00:00	00:01
1717	14/09/97	16:00	16:02	2804	05/09/00	19:11	19:11
1754	21/10/97	06:23	06:20	2860	31/10/00	17:35	17:43
1804	10/12/97	14:23	14:23	2890	30/11/00	21:47	21:44
1882	26/02/98	18:37	18:34	2973	21/02/01	19:11	18:56
1889	05/03/98	01:39*	02:02	3036	25/04/01	19:12	18:44
1944	29/04/98	12:47	12:47	3099	27/06/01	16:00	16:06
1963	18/05/98	11:11	11:11	3101	29/06/01	20:56	20:20
1968	23/05/98	06:23	06:23	3189	25/09/01	17:39*	18:01
1983	07/06/98	03:15*	02:30	3231	06/11/01	17:35	17:35
2000	24/06/98	11:11	11:11	3234	09/11/01	20:47	20:53
2130	01/11/98	11:11	11:11	3237	12/11/01	22:26	22:33
2131	02/11/98	06:23	06:23	3239	14/11/01	04:51*	05:30
2132	03/11/98	06:23	06:23	3252	27/11/01	20:47	20:47

* Indicates 5-min averaged magnetograms.

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