Table 1: General information about the observations. In the table, (date) is that of observation night, (T) is the total time length of the observation in minutes, (N) is the number of images, (S) is the mean number of reference stars, (C) is the dimension of the CCD in pixel, (P) is the size of the pixel in $\mu$ m and (s) is the plate scale in arcsecond. For the CCD used in 2000 the pixel is binned from the original $\rm 9~\mu m\times 9~\mu m$ size.
Date
T N S C P s

2002-08-08 46 23 50 1024 $\times$ 1024 22 $\times$ 22 0.30

2002-08-10 96 22 40 1024 $\times$ 1024 22 $\times$ 22 0.30

2001-08-21 111 15 20 1024 $\times$ 1024 22 $\times$ 22 0.30

2000-10-12 60 4 12 1536 $\times$ 1024 18 $\times$ 18 0.25

**Table 1:** General information about the observations. In the table, (date) is that of observation night, (T) is the total time length of the observation in minutes, (N) is the number of images, (S) is the mean number of reference stars, (C) is the dimension of the CCD in pixel, (P) is the size of the pixel in $\mu$ m and (s) is the plate scale in arcsecond. For the CCD used in 2000 the pixel is binned from the original $\rm 9~\mu m\times 9~\mu m$ size.
Date	T	N	S	C	P	s
2002-08-08	46	23	50	1024 $\times$ 1024	22 $\times$ 22	0.30
2002-08-10	96	22	40	1024 $\times$ 1024	22 $\times$ 22	0.30
2001-08-21	111	15	20	1024 $\times$ 1024	22 $\times$ 22	0.30
2000-10-12	60	4	12	1536 $\times$ 1024	18 $\times$ 18	0.25

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