\begin{table}%t2
\caption{The main parameters of the spectral model for
  the average \mbox{XMM-Newton} spectra from 2005 and 2006. The numbers in brackets are the
  errors and have to be multiplied by the same power of ten as to that for the
  parameters. ``n.h.p.'' is the ``null hypothesis probability''.} \label{tab:pars_spec}
%\centerline
 {\small \begin{tabular}{l l l l}
 \hline \hline
 &  & 2005  & 2006 \\
  \hline \noalign{\smallskip}
wabs  &$n$H [10$^{22}$~cm$^{-2}$] &4.1E-02 (0.8)   & 4.7E--02 (0.6)\\
pcfabs &$n$H [10$^{22}$~cm$^{-2}$] &7.9 (0.6)   & 9.5 (0.5)\\
 &CvrFract &0.61 (0.02) & 0.67 (0.01)\\
mekal &$kT$ [keV]  &79.9 [35]$^{1}$ & 79.9 [35]$^{1}$ \\
 &norm        &7.3E-03 (0.4) & 6.5E-03 (0.3)\\
bbody  &$kT$ [keV]  &5.9E-02 (0.07) & 5.4E-02 (0.05)\\
 &norm  &1.9E-04 (0.9) & 2.2E-04 (0.9)\\
Gaussian  &LineE [keV]  &6.4 (-- $^{2}$) & 6.4 (-- $^{2}$)\\
 &Sigma [keV] &0.1 (-- $^{2}$) & 0.07 (0.02)\\
 &norm       &3.1E-05 (0.7) & 2.9E--05 (0.6)\\
Gaussian  &LineE [keV]      &6.7 (-- $^{2}$) & 6.7 (-- $^{2}$)\\
 &Sigma [keV] &0.1 (-- $^{2}$) & 0.09 (0.03)\\
  &norm       &3.1E-05 (0.7) & 2.5E--05 (0.7)\\
$\chi^{2}_{\nu}$ (d.o.f) &  & 1.034659 (948) & 1.046327 (1754)\\
n.h.p.&  & 2.2E--01 & 8.7E-02\\
 \hline
\end{tabular}}
\medskip 
$^{1}$ The temperature of the {\it mekal} component ran against its upper limit. The value in brackets is the plasma temperature which is compliant with both the XMM and {\it INTEGRAL} spectrum (see Fig.~\ref{fig:MUCam_SED} and Chap.~\ref{chap:spec_anal}). $^{2}$ The parameters were fixed to these values.
\end{table}