\begin{table}%t2
\caption{Results of the spectral analysis on the CXB for the 
MOS~cameras. Only single pixel events (PATTERN~0) have been used. The 
normalization is expressed in photons~cm$^{-2}$~s$^{-1}$~sr$^{-1}$~keV$^{-1}$ 
at~3~keV (not corrected for the stray light contribution). The quoted 
uncertainties are purely statistical errors at the 90\% confidence level for a single 
interesting parameter.} \label{tableresp0}
%%\centering
\par
\begin{tabular}{cccc} 
\hline \hline
Instrument & Photon index &   Normalization & $\chi^{2}_{\nu}$/d.o.f.  \\ 
\hline
MOS1   & 1.42 $\pm$ 0.08 & 2.60 $\pm$ 0.06 & 1.18/35  \\ \hline
MOS2      & 1.41 $\pm$ 0.08 & 2.59 $\pm$ 0.06  &  1.21/35   \\  \hline
MOS1+MOS2      & 1.42 $\pm$ 0.06 & 2.596 $\pm$ 0.043 & 1.16/72 \\ \hline 
\end{tabular}
\end{table}