Table 1: Journal of observations. Phases are calculated according to the ephemeris of Stahl et al. (1996), ${\rm JD} = 2~448~833.0 + 15.422~{\rm E}$ . The peak S/N per pixel in the continuum is quoted in the final column.
No. Date HJD Phase $t_{\rm exp}$ S/N

(-2450000) [minutes] pixel^-1

01 1997 Feb. 20 0500.3453 0.1147 40 280

02 1997 Feb. 22 0502.3429 0.2442 40 450

03 1997 Feb. 23 0503.3230 0.3078 40 140

04 1997 Feb. 25 0505.3160 0.4370 40 300

05 1998 Feb. 15 0860.4021 0.4616 40 250

06 1998 Feb. 26 0871.3354 0.1706 40 270

07 2000 Feb. 03 1578.4219 0.0198 40 250

08 2000 Feb. 03 1578.4536 0.0218 40 240

09 2000 Feb. 04 1579.3932 0.0828 40 250

10 2000 Feb. 04 1579.4235 0.0847 40 270

11 2000 Feb. 04 1579.4539 0.0867 40 320

12 2000 Feb. 12 1587.3739 0.6003 40 340

13 2000 Feb. 15 1590.3822 0.7953 40 310

14 2000 Feb. 15 1590.4131 0.7973 40 260

15 2000 Feb. 21 1596.3907 0.1849 40 270

16 2000 Feb. 21 1596.4211 0.1869 40 370

17 2000 Feb. 21 1596.4518 0.1889 40 350

18 2000 Feb. 22 1597.3515 0.2472 40 410

19 2000 Feb. 22 1597.3823 0.2492 40 400

20 2000 Feb. 22 1597.4133 0.2512 40 410

21 2000 Feb. 22 1597.4439 0.2532 40 380

22 2000 Feb. 24 1599.3534 0.3770 40 410

23 2000 Feb. 24 1599.3840 0.3790 40 400

24 2000 Feb. 24 1599.4156 0.3811 40 340

25 2000 Feb. 25 1600.3465 0.4414 40 410

26 2000 Feb. 25 1600.3780 0.4435 40 410

27 2000 Feb. 25 1600.4105 0.4456 40 390

28 2000 Feb. 26 1601.3610 0.5072 40 340

29 2000 Feb. 26 1601.3922 0.5092 40 340

30 2000 Feb. 26 1601.4229 0.5112 40 310

31 2000 Feb. 27 1602.3490 0.5713 40 360

32 2000 Feb. 27 1602.3881 0.5738 40 350

33 2000 Feb. 27 1602.4191 0.5758 40 310

34 2000 Feb. 28 1603.3767 0.6379 40 240

35 2000 Feb. 28 1603.4077 0.6399 40 300

36 2000 Feb. 28 1603.4391 0.6420 40 230

37 2000 Mar. 02 1606.3531 0.8309 40 340

38 2000 Mar. 02 1606.3844 0.8329 40 390

39 2000 Mar. 02 1606.4161 0.8350 40 340

40 2000 Mar. 04 1608.3696 0.9617 40 470

41 2000 Mar. 04 1608.4005 0.9637 40 410

42 2000 Mar. 04 1608.4311 0.9657 40 360

43 2000 Mar. 05 1609.3605 0.0259 40 350

44 2000 Mar. 05 1609.3910 0.0279 40 310

45 2000 Mar. 05 1609.4216 0.0299 40 260

**Table 1:** Journal of observations. Phases are calculated according to the ephemeris of Stahl et al. (1996), ${\rm JD} = 2~448~833.0 + 15.422~{\rm E}$ . The peak S/N per pixel in the continuum is quoted in the final column.
No.	Date	HJD	Phase	$t_{\rm exp}$	S/N
				(-2450000)		[minutes]	pixel^-1
01	1997	Feb.	20	0500.3453	0.1147	40	280
02	1997	Feb.	22	0502.3429	0.2442	40	450
03	1997	Feb.	23	0503.3230	0.3078	40	140
04	1997	Feb.	25	0505.3160	0.4370	40	300
05	1998	Feb.	15	0860.4021	0.4616	40	250
06	1998	Feb.	26	0871.3354	0.1706	40	270
07	2000	Feb.	03	1578.4219	0.0198	40	250
08	2000	Feb.	03	1578.4536	0.0218	40	240
09	2000	Feb.	04	1579.3932	0.0828	40	250
10	2000	Feb.	04	1579.4235	0.0847	40	270
11	2000	Feb.	04	1579.4539	0.0867	40	320
12	2000	Feb.	12	1587.3739	0.6003	40	340
13	2000	Feb.	15	1590.3822	0.7953	40	310
14	2000	Feb.	15	1590.4131	0.7973	40	260
15	2000	Feb.	21	1596.3907	0.1849	40	270
16	2000	Feb.	21	1596.4211	0.1869	40	370
17	2000	Feb.	21	1596.4518	0.1889	40	350
18	2000	Feb.	22	1597.3515	0.2472	40	410
19	2000	Feb.	22	1597.3823	0.2492	40	400
20	2000	Feb.	22	1597.4133	0.2512	40	410
21	2000	Feb.	22	1597.4439	0.2532	40	380
22	2000	Feb.	24	1599.3534	0.3770	40	410
23	2000	Feb.	24	1599.3840	0.3790	40	400
24	2000	Feb.	24	1599.4156	0.3811	40	340
25	2000	Feb.	25	1600.3465	0.4414	40	410
26	2000	Feb.	25	1600.3780	0.4435	40	410
27	2000	Feb.	25	1600.4105	0.4456	40	390
28	2000	Feb.	26	1601.3610	0.5072	40	340
29	2000	Feb.	26	1601.3922	0.5092	40	340
30	2000	Feb.	26	1601.4229	0.5112	40	310
31	2000	Feb.	27	1602.3490	0.5713	40	360
32	2000	Feb.	27	1602.3881	0.5738	40	350
33	2000	Feb.	27	1602.4191	0.5758	40	310
34	2000	Feb.	28	1603.3767	0.6379	40	240
35	2000	Feb.	28	1603.4077	0.6399	40	300
36	2000	Feb.	28	1603.4391	0.6420	40	230
37	2000	Mar.	02	1606.3531	0.8309	40	340
38	2000	Mar.	02	1606.3844	0.8329	40	390
39	2000	Mar.	02	1606.4161	0.8350	40	340
40	2000	Mar.	04	1608.3696	0.9617	40	470
41	2000	Mar.	04	1608.4005	0.9637	40	410
42	2000	Mar.	04	1608.4311	0.9657	40	360
43	2000	Mar.	05	1609.3605	0.0259	40	350
44	2000	Mar.	05	1609.3910	0.0279	40	310
45	2000	Mar.	05	1609.4216	0.0299	40	260

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