Table 1: Log of the observations.

Run/Instrument	Night	Seeing [arcsec]	Airmass	Photometric conditions	Observation mode
1/FORS1	12-09-1999	0.9-1.2	1.00-1.20	Photometric	Visitor
1/FORS1	13-09-1999	0.7-1.2	1.03-1.24	Photometric	Visitor
2/FORS2	05-07-2000	0.5	1.11	Photometric	Service
2/FORS2	27-09-2000	0.5-0.7	1.44-1.80	Photometric	Service
2/FORS2	28-09-2000	0.9-1.0	1.22-2.27	Photometric	Service
2/FORS2	29-09-2000	0.5-0.7	1.51-1.93	Photometric	Service

Note: Seeing values are given from the DIMM or the Guide Probe, as available in the observations log.