\begin{table}%t2
%\centering
\par
\caption {Observational information of the XMM-Newton data. Column~(1): cluster name; Col.~(2): filter in which cluster was observed; Col.~(3): total exposure time; Cols.~(4--6): exposure time after flare cleaning in each detector.\label{obsinfo}}
\begin{tabular}{cccccc}
\hline\hline
 Cluster & Filter & $t_{\rm exp_{\rm tot}}$ (ks)& \multicolumn{3}{c}{$t_{\rm exp}$ (ks)}  \\
         &   & & MOS1 & MOS2 & PN\\
\hline\noalign{\smallskip}
%A267  & 30.199   & 16.05 & 15.27 & 10.80 \\
A496  & Thin1  & 30.87 & 14.44 & 14.54 &  8.40 \\  
A1689 & Thin1  & 39.81 & 34.24 & 34.64 & 27.03 \\
A2050 & Thin1  & 28.41 & 24.01 & 24.64 & 19.87 \\
A2631 & Thin1  & 14.12 & 9.32  & 11.35 & 5.00 \\
A2667 & Medium & 31.16 & 22.03 & 22.17 & 13.88 \\
\hline	  
\end{tabular}
\end{table}