\begin{table}%t1
  \caption{\label{tab1}Log of  the \vlt\ \fors\ and \forstwo\ B-band observations of  \zerofour.}
%\centerline
{
\par
\begin{tabular}{lccccc} 
 \hline\hline
& Date & $N$ &  $T$ (s) & $IQ$  ($\arcsec$)  & Airmass	\\  
FORS1 & 2000-11-21 &  3 & 3600 & 0.74 (0.08)&  1.14    \\ \hline 
FORS2 &2006-11-25 &  5 & 2915 & 0.71 (0.10)&  1.24  \\ 
&2007-01-16 & 10 & 5830 & 0.93 (0.18)&  1.18  \\ 
&2007-01-22 &  5 &2915 & 0.82 (0.11)&  1.19  \\           
&2007-02-11 &  5 & 2915 & 0.82 (0.12)&  1.30  \\                           \hline 
\end{tabular}}\medskip
\par
Columns report the observing date (yyyy-mm-dd), the number of exposures ($N$) and the total integration time per night ($T$), the  image quality ($IQ$) and rms (in parentheses),  as computed on the image,  and the airmass. Values are the average computed over the exposure sequence.
\end{table}