\begin{table}%T1
\caption{Log of the observations.}\label{t1}
%\centerline
{
\begin{tabular}{rrrrrr}
\hline\hline
Run/Instrument  &  Night  &  Seeing [arcsec]  &  Airmass  &  Photometric conditions & Observation mode \\
\hline     
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 \\
\hline
\end{tabular}}
\par
\medskip
Note: Seeing values are given from the DIMM or the Guide Probe, as available 
in the observations log.
\end{table}