\begin{table}%t1
\par
\caption{Log of the observing campaign. \label{tab1}}
%\begin{center}
{\begin{tabular}{cccccc}
\hline\hline
Revolution &  Obs. Id. & Start time & Obs. mode & Total exposure & Net exposure$^a$ \\
           &          &  (UT)      &           & ($\times 10^4$ s) & ($\times 10^4$ s) \\
\hline
0532 & 0136540301 & 2002--11--04 &  Prime Full & 2.39 & 1.29 \\
     &            & 01:07:55     &  Window     &      &  \\
0532 & 0136540401 & 2002--11--04 &  Prime Full & 2.39 & 1.28 \\
     &            & 08:04:39     &  Window     &      &            \\
0537 & 0136540701 & 2002--11--14 &  Prime Large & 7.15 & 3.77  \\
     &            & 00:07:35     &  Window      &      &            \\
0546 & 0136541001 & 2002--12--01 &  Timing      & 7.11 & 5.49 \\
     &            & 23:18:35     &              &      &             \\
\hline
\end{tabular}}
$^a$ Times referring to CCD--4.
\end{table}