Table 1: Details of the imaging observations. The first column gives the telescope and instrument used, Col. 4 gives the pixel size in arcseconds, while the last column gives the integration time in seconds.

Instr.	Band	Date	scale	t
VLT-FORS2	R	13-05-2002	0.252	15 s
VLT-FORS1	R	11-04-2000	0.200	30 s
NTT-SOFI	J	24-02-1999	0.290	300 s
1.54 m-DFOSC	V	14-04-1997	0.390	600 s