\begin{table}%t2
      \caption{\label{spectra}Spectral parameters as derived from  
 simultaneously fitting the EPIC PN and MOS phase--averaged spectra
for the two best fit models discussed in the text. Quoted errors refer to 
the 90$\%$confidence level for the parameter of  interest.}
         \small
     %\centerline
{
\begin{tabular}{ c c c c c c c c c c c c}
            \hline \hline
 & \multicolumn{2}{c}{Partial Absorber } & \multicolumn{2}{c}{Black-body} 
 & \multicolumn{3}{c}{{\sc mekal}  } & \multicolumn{3}{c}{{\sc mekal}$^{a}$ } & $\chi^2_{\nu}$ ($\chi^2$/d.o.f.) \\
            \noalign{\smallskip}
 & $N_{\rm H}^{b}$   & $\rm Cov_{F}$$^{c}$ & $kT_{\rm BB}$ & $C_{\rm BB}^{d}$ & 
$A_{\rm Z}^{e}$ & $kT_{1}$ & $C_{1}^{f}$ & $kT_{2}^{g}$ &
$C_{2}^{f}$ & $\alpha^{h}$ &  \\
            \noalign{\smallskip}
& ($10^{23}$~cm$^{-2}$) & & (eV) & $(10^{-5})$ &  & (keV) & $(10^{-4})$ & 
(keV) & $(10^{-4})$ &  \\ 
            \hline
            \noalign{\smallskip}
{A} & $\rm 1.0^{+0.4}_{-0.3}$ & $\rm 0.51^{+0.07}_{-0.09}$ & 
$\rm 49.7^{+5.6}_{-2.9}$ & $\rm 1.3^{+0.5}_{-0.3}$ & 0.39 $\pm$ 0.16 &
0.18 $\pm$ 0.02 &  $\rm 2.4^{+1.1}_{-0.9}$ & $\rm 11^{+6}_{-2}$ & 
$\rm 19.04^{+0.38}_{-1.98}$ & & 0.906 (522/576) \\
            \noalign{\smallskip}
{B} & $\rm 0.83^{+0.51}_{-0.32}$ & $\rm 0.43^{+0.15}_{-0.17}$ & 
51.2 $\pm$ 6.0 &  $\rm 1.04^{+0.63}_{-0.28}$ & $\rm 0.53^{+0.71}_{-0.26}$ & 
$\rm 0.18^{+0.02}_{-0.01}$ & $\rm 1.6^{+2.0}_{-1.0}$ & $\rm 27^{+\infty}_{-17}$ & 
$\rm 53.48^{+68.16}_{-19.75}$ & $\rm 1.6^{+2.9}_{-0.40}$ & 0.905 (520/575) \\
                 \hline
\end{tabular}}
\smallskip
$^a$ Second optically thin plasma is a {\sc mekal} (model {A}) or 
{\sc cemekl} (model {B}). 
$^b$ Column density of the partial absorber. 
$^c$ Covering fraction of partial absorber. 
$^d$ Normalization constant of black-body ({\sc bbody}) defined 
as $L_{39}~d_{10}^{-2}$, where $L_{39}$ is the luminosity in 
units of  10$^{39}~\rm erg~s^{-1}$ and, $d_{10}$ the distance in units 
of 10~kpc. 
 $^e$ Metal abundance in units of the cosmic value (Anders \& Grevesse
\cite{andersgrevesse}) linked for the two thin plasma emissions. 
$^f$ Normalization constant of {\sc mekal} or {\sc cemekl } model 
defined as ${\rm EM}\times10^{-14}~(4~\pi~D^2)^{-1}$, where EM is the 
emission  measure in $\rm cm^{-3}$ and~$D$ is the distance in cm.  
$^g$ Maximum temperature in {\sc cemekl}. 
$^h$ Power law  index in {\sc cemekl}. 
\end{table}