\begin{table}%t1
\par
\caption{\label{modestab}Data modes of \mbox{XMM-Newton} exposures included in the 2XMM catalogue.} 
\small
%\centering
\par
\begin{tabular}{lll}
\hline \hline
Abbr. & Designation & Description \\
\hline
\multicolumn{3}{l}{\it \ \ MOS cameras:} \\
PFW  &	Prime Full Window & covering full FOV \\
PPW2 &	Prime Partial W2 & small central window \\
PPW3 &	Prime Partial W3 & large central window \\
PPW4 &	Prime Partial W4 & small central window \\
PPW5 &	Prime Partial W5 & large central window \\
FU &	Fast Uncompressed & central CCD in timing mode \\
RFS &   Prime Partial RFS  & central CCD with different frame \\
    &                      & \ \ time (``Refreshed Frame Store'') \\
\multicolumn{3}{l}{\it \ \ pn camera:} \\
PFWE  &	Prime Full Window & covering full FOV \\
      &	 \ \ \ Extended & \\
PFW &	Prime Full Window & covering full FOV  \\
PLW &	Prime Large Window & half the height of PFW/PFWE \\ 
\hline 
\end{tabular}
\end{table}