\begin{table}%t2
\par
\caption{\label{obssumtab}Characteristics of the 3491 \mbox{XMM-Newton} observations included in
 the 2XMM catalogue.}
 \small%\centerline
{
\begin{tabular}{l r r r r r r r}
\hline \hline
Camera &\multicolumn{3}{c}{Modes} & \multicolumn{3}{c}{Filters} & Total \\
 & full$^a$ 
& window$^b$
& other$^c$
& thin & medium & thick \\
\hline
pn	&2441&	233&	--	&1233&	1259&	182&	2674\\
MOS1	&2560&	605&	219	&1314&	1772&	298&	3384\\
MOS2	&2612&	655&	127	&1314&	1777&	303&	3394\\
\hline
\end{tabular}}
\smallskip
$^a$  PFWE and PFW modes; $^b$   pn PLW mode and any of the various MOS PPW modes;
$^c$  other MOS modes (FU, RFS).  
\end{table}