\begin{table}%t10
\par
\caption{\label{sumtable}Summary of 2XMM catalogue characteristics.}
\small
%\centerline
{
\begin{tabular}{llr}
\hline\hline
\multicolumn{2}{l}{Energy range (keV; set by EPIC cameras)} & 0.2$-$12.0 \\
\hline
Observations & {\it total} & 3491 \\
             & pn data     & 2674 \\
	     & MOS1 data   & 3384 \\
	     & MOS2 data   & 3394 \\
%\hline
Time interval   & \multicolumn{2}{r}{Feb. 2000$-$Mar. 2007} \\
%\hline
Detections & {\it total}            & 246~897 \\
           & {\it  total} $L\ge 10$ & 201~275 \\
           & {\it  total} sum flag 0& 199~359 \\
           & point-like             & 226~060 \\
	   & extended               & 20~837 \\
           & with products          & 38~320 \\
%\hline
Unique sources & {\it total}   & 191~870 \\
	       & point-like    & 173~066 \\
	       & extended      & 18~804 \\
%\hline
Sky area \ (deg$^2$ ) & {\it total}~$^{a}$ & $\sim$$560$ \\
            	    & net MOS1/2          & $\sim$$355$ \\
	            & net pn              & $\sim$$330$ \\
%\hline
Median exposure time & MOS1/2 & $\sim$$16~000$ s\\
\ \ \ \ \ \ (per observation)    & pn     & $\sim$$12~500$ s\\
%\hline
Flux limit (pn) at  $\sim$$10$\% sky & 0.5$-$2.0~keV   & $\sim$$2$ \\
\ coverage \  ($10^{-15}~\rm\ erg\ cm^{-2}\ s^{-1}$ )  & 2.0$-$12~keV    & $\sim$$15$ \\	
                    & 4.5$-$12~keV  & $\sim$$35$ \\
%\hline
Flux limit (pn) at  $\sim$$90$\% sky & 0.5$-$2.0~keV  & $\sim$$10$ \\
\ coverage  \  ($10^{-15}~\rm\ erg\ cm^{-2}\ s^{-1}$ )     & 2.0$-$12~keV   & $\sim$$90$ \\	
                 & 4.5$-$12~keV & $\sim$$250$ \\
%\hline
 Astrometric accuracy \ (1$\sigma$)& typical    & 1.5\arcsec \\
\ \ \ \ \ \   & best$^{b}$ & 0.35\arcsec \\
%\hline
Photometric accuracy & MOS1/2 comparison & $\le$$5$\% \\
		     & pn/MOS comparison    & $\le$$10$\% \\ 
\hline
\end{tabular}}
\smallskip
 $^{{a}}$ Overlaps included;
 $^{{b}}$ limited by systematics.
\end{table}