\begin{table}%t1
%\centering
\par
\caption{\footnotesize Duration after flare rejection. The location of the different pointings is shown in Fig. \ref{X_ray_images}\label{duree_obs}.}
\begin{tabular}{cccccccl}
\hline\hline
Pointing & Symbol & OBS\_ID & Date & \multicolumn{3}{c}{Exposure time (ks)} & Comment\\ & & & & MOS1 & MOS2 & pn & \\ \hline
NE & $\Box$ & 0093670101 & 2001-09-05 & 1.6 & 2.0 & 0 & Very bad quality \\
NW & \usebox{\blackbox} & 0093670201 & 2001-09-05 & 4.0 & 5.4 & 1.0 & Bad quality \\
SW & {\large $\bullet$} & 0093670301 & 2001-09-08 & 15.3 & 15.5 & 10.0 & Good quality \\
SE & {\large $\circ$} & 0093670401 & 2002-03-14 & 12.2 & 12.2 & 6.8 &  Good quality \\
CE & $\triangle$ & 0093670501 & 2001-03-02 & 13.0 & 13.2 & 7.3 & Good quality \\ \hline 
\end{tabular}
\end{table}