\begin{table}%t3
\caption{The \mbox{X-ray} model fit results.}\label{tab:xresults} 
%\centerline
 {\small 
\begin{tabular}{lcccc}
  \hline  \hline            
&N4235 & N4639 & N5033 & N5273 \\
\hline  
$N_{\rm H,{\rm Gal}}^\dagger$ & 1.53 & 2.35 & 1 & 0.96  \\
$N_{\rm H,{\rm int}}^\dagger$ & $16\pm 1$ & -- & -- & $94\pm4$ \\
{\tt PL} & & & & \\
 $\Gamma$ & 1.61 & 1.86 &   1.70 & 1.44 \\
 & ($\pm 0.03$) & ($\pm 0.04$) & ($\pm 0.01$) & ($\pm 0.03$) \\
 $A^\ast$ & 5.9 & 1.33 & 10.3 & $10.5^{+0.3}_{-0.5}$ \\
& ($\pm$0.2) & ($\pm$0.04) & ($\pm$0.1) & \\
\hline
{\tt GAUSS} & & & & \\
$E_l$[keV] & $6.36$       & -- &  $6.43$       & $6.40$ \\
& ($\pm$0.02) &  & ($\pm$0.02) & ($\pm$0.02) \\
$EW$[eV]  & 242$^{+124}_{-108}$ & -- & 275$^{+95}_{-85}$ & $190^{+75}_{-65}$ \\
\hline
{\tt ABSORI}  & & & & \\
 $\xi^{a}$    & --  & -- &  --   & $26\pm 6$     \\
 \hline
{\tt MEKAL} & & & & \\
$kT$[keV]  & --  & -- & -- & $0.18$ \\
 &      & & & $\pm$0.03 \\
$\chi^2_{\rm red}$/d.o.f.  & 1.08/596 & 1.11/230 & 1.01/901 & 1.06/1042 \\
$f_{\rm 2\mbox{-}10~keV}^{b}$ & 2.8 & 42.7 & 4.3 & 6.3 \\
$L_{\rm 2\mbox{-}10~keV}^{c}$ & 4.8 & 0.17 & 1.2 & 2.3 \\ 
\hline                                    
\end{tabular}}
\medskip
 Model fits were performed to the joint PN + MOS1+2 spectra in the
0.4--10~keV range. Errors are at the 90\% level for one interesting
parameter; $^\dagger$~in units of 10$^{20}$~cm$^{-2}$;  $^\ast$~PL normalization at 1~keV in $10^{-4}$~photons~cm$^{-2}$~s$^{-1}$~keV$^{-1}$; $^{a}$ the ionization parameter which  determines the absorber ionization state, and is defined as $\xi=L/(nR^2)$;   $^{ b}$~in units of $10^{-12}$~\flux; $^{c}$ in units of $10^{41}$~\ergs . 
\end{table}