\begin{table}%t1
%\centering
\par
\caption{The \INTEGRAL\ Data set. We selected all public and core programme revolutions
         when \IGR\ was within the ISGRI PCFOV of $29\degr \times 29 \degr$.
         The observing time fraction was calculated as the ratio between the
         net exposure time on the source and the elapsed time during the visibility
         periods.
\label{tabDataSet}}
\begin{tabular}{c c c c c}
\hline\hline
Visibility periods & Start & End   & Revolutions & Observing time fraction \\ 
     & [MJD] & [MJD] & & \\ 
\hline			    
   1 & 52671 & 52752 &  37--63 & 0.23\\
   2 & 52859 & 52925 & 100--121 & 0.51\\
   3 & 53050 & 53116 & 164--185 & 0.20\\
   4 & 53236 & 53294 & 226--244 & 0.16\\
\hline
\end{tabular}
\end{table}