\begin{table}%t1
%\centering
\par
\caption{XMM-Newton observation information. All observations are
  performed in Full Frame with the Thin Optical filter applied except
  in Rev.~175 where the Medium filter was used.\label{XMM}}
\begin{tabular}{lccc}
\hline
\hline\noalign{\smallskip}
{Rev.} & {Instrument}   & {Epoch} & {Exposure}\\
\hline
78 & mos1 & 2000 May 13& 48~ks\\
175 & pn  & 2000 Nov. 21--22& 23~ks\\
533 & pn  & 2002 Nov. 6--7& 26~ks\\
533 & mos1  & 2002 Nov. 6--7& 30~ks\\
534 & pn  & 2002 Nov. 8--9& 27~ks\\
534 & mos1  & 2002 Nov. 8--9& 32~ks\\
622 & mos1  & 2003 May 2--3& 24~ks\\
711 & mos1  & 2003 Oct. 27--28& 14~ks\\
815 & pn  & 2004 May  22--23& 22~ks\\
815 & mos1  & 2004 May 22--23& 26~ks\\
1086 & pn & 2005 Nov. 12--13& 34~ks\\
\hline\noalign{\smallskip}
\end{tabular} 
\end{table}