\begin{table}%T9
\caption{\label{flux_comp}Summary of the statistical comparison of the 2XMM fluxes from the
EPIC cameras.}
\small
%\centerline
{
\begin{tabular}{c r r r r r r}
\hline\hline
Energy band &  pn$-$M1 & ${N_{\rm pn-M1}}$ & pn$-$M2 & ${N_{\rm pn-M2}}$ & M2$-$M1 & ${N_{\rm M2-M1}}$ \\ 
\ [keV] & [\%] & & [\%] & & [\%] & \\
(1) & (2) & (3) & (4) & (5) & (6) & (7)\\
\hline
$0.2{-}0.5$ &$ 4.9 \pm 1.2$&  785 &$ 8.4 \pm 0.9$&  771 &$-0.9 \pm 0.6$&  987 \\
$0.5{-}1.0$ &$-2.4 \pm 0.3$& 1906 &$-2.7 \pm 0.2$& 1957 &$ 1.0 \pm 0.3$& 2384 \\
$1.0{-}2.0$ &$-7.6 \pm 0.3$& 2394 &$-8.6 \pm 0.3$& 2461 &$ 0.6 \pm 0.2$& 2932 \\
$2.0{-}4.5$ &$-6.1 \pm 0.3$& 1311 &$-5.4 \pm 0.3$& 1342 &$-0.8 \pm 0.2$& 1552 \\
$4.5{-}12.0$           & $-12.4\pm0.7$ &  387 & $-9.5\pm0.6$ &  408 & $-3.2\pm0.4$ &  441 \\
\hline
\end{tabular}}
\smallskip
(1):  energy band definition in~keV;
(2) and (3): difference (in \%) in the measured flux in pn and M1 
and number of sources used in the comparison; 
(4) and (5): same as Cols.~(2) and~(3) but for pn and M2;
(6) and (7): same as Cols.~(2) and~(3) but for M2 and M1.
\end{table}