\begin{table}%t6
\par
\caption{Results of the EPIC PN spectral analysis.\label{tab:xfit}}
%\centerline
{\begin{tabular}{cl}
\hline\hline
Model & Parameters\\
\hline
{\bf PL$\cdot$Abs.} & $\Gamma=2.77^{+0.04}_{-0.04}$; $F_{\rm p12}=4.38^{+0.14}_{-0.13}$\\
   (A)              & $N_{\rm H20}=16.0^{+0.7}_{-0.6}$ \\
                    & ${\bf \chi^2/\nu=1.30}~(621./478)$\\
          % \\
{\bf PL+Thermal} (bbody)  &$\Gamma=2.50^{+0.09}_{-0.05}$; $F_{\rm p12}=3.38^{+0.36}_{-0.18}$; \\
{\bf  $\cdot$Abs.} & $kT=.14^{+0.01}_{-0.02}$;\\ 
   (B)             & $L_{39}/D^{2}_{10}=(2.84^{+1.64}_{-0.47})\times 10^{-5}$; \\
                   & $N_{\rm H20}=16.4^{+2.6}_{-1.1}$; \\
                   & ${\bf \chi^2/\nu=1.03}~(492./476)$\\ 
          % \\
{\bf PL+Thermal} (diskbb)  &$\Gamma=2.51^{+0.07}_{-0.07}$; $F_{\rm p12}=3.40^{+0.29}_{-0.26}$; \\
{\bf  $\cdot$Abs.} & $T{\rm in}=.16^{+0.02}_{-0.01}$;\\ 
   (C)             & $(R_{\rm in}/D)^{2} cos \theta=407^{+516}_{-193}$ \\
                   & $N_{\rm H20}=18.7^{+2.3}_{-0.9}$; \\
                   & ${\bf \chi^2/\nu=1.04}~(496./476)$\\ 
           %\\
{\bf PL+Thermal} (mekal) &$\Gamma=2.65^{+.05}_{-.05}$; $F_{\rm p12}=3.97^{+0.23}_{-0.19}$; \\
{\bf  $\cdot$Abs.}  & $kT=.22^{+0.02}_{-0.02}$; $Z=1.0$;\\ 
   (D)             & $A_{\rm t}=(3.93^{+1.75}_{-0.77})\times 10^{-4}$; \\
                   & $N_{\rm H20}=16.2^{+1.3}_{-0.9}$; \\
                   & ${\bf \chi^2/\nu=1.06}~(505./476)$\\ 
          % \\
{\bf PL+Thermal} (mekal+ &$\Gamma=2.52^{+.06}_{-.08}$; $F_{\rm p12}=3.42^{+.22}_{-0.32}$; \\
bbody){\bf $\cdot$Abs.}  & $kT_{\rm mekal}=.15^{+0.03}_{-0.04}$; $Z=1.0$;\\ 
   (E)                   & $A_{\rm t}=(4.6^{+10.3}_{-2.0})\times 10^{-4}$; \\
                         &  $kT_{\rm bbody}=.15^{+0.01}_{-0.03}$;\\
                         & $L_{39}/D^{2}_{10}=(2.2^{+1.3}_{-0.6})\times 10^{-5}$; \\
                         & $N_{\rm H20}=16.9^{+1.3}_{-1.7}$; \\
                         & ${\bf \chi^2/\nu=0.98}~(463./474)$\\
\hline
\end{tabular}}
\par
\smallskip
Fit parameters are shown with 90\% errors ($\Delta \chi^2=2.7$). 
The model and parameter definitions are:
model components -- {\bf PL}: power-law with a photon index of $\Gamma$ 
and a 0.5--2 keV flux of $F_{\rm p12}$ in units of 10$^{-12}$~erg~cm$^{-2}$~s$^{-1}$. 
{\bf Thermal -- thin plasma}: thermal plasma using the XSPEC {\em mekal} model with 
a plasma temperature $kT$ [keV], a metal abundance $Z=1$ in solar units, 
and the normalization defined by XSPEC $A_{\rm th}$. 
{\bf Thermal -- multi color disk}: the multicolor disk (Mitsuda et~al. \cite{Mit84}) distributed
as the XSPEC model (diskbb) with an inner disk temperature $kT_{\rm in}$ and with an normalization defined as
$(R_{\rm in}/D) \cos \theta$, where $R_{\rm in}$ is the inner disk radius and $D$ is the distance to the source in 10~kpc units, and $\theta$ is the viewing angle of the disk axis. 	
{\bf Thermal -- thick plasma}: thermal thick plasma using the XSPEC {\em bbody}
 model with a plasma temperature $kT$ [keV], with a normalization defined as $L_{39}$/$D^{2}_{10}$,
where $L_{39}$ is the source luminosity in units of 10$^{39}$~erg~s$^{-1}$ and $D_{10}$ is the distance to the source in units of 10~kpc.
{\bf Abs}: absorption by neutral gas using the XSPEC model {\em wabs} 
(Morrison R. McCammon D. 1983, ApJ 270 190) with hydrogen column density 
$N_{\rm H20}$ $[10^{20}~{\rm cm}^{-2}]$.
\end{table}