\begin{table}%t4
%\centering
\par
\caption{ Spectral analysis of {\it BeppoSAX} data.}\label{t4}
\begin{tabular}{  l    l }
\hline\hline
 Model          &  Parameters\\
\hline
\par
{\bf A}: pl     &  $\chi^2/\nu$ = 49.62/43   \\
$\Gamma $    &  $2.15 \pm 0.15$  \\
\hline
\par
{\bf B}: mekal & $\chi^2/\nu$ = 50.24/43  \\
$kT$ (keV)        & $4.09 \pm 0.77$   \\
$Z$ $(Z_\odot)$   & $1.0$ (f)  \\
\hline
\par
{\bf C}: pl+Gauss & $\chi^2/\nu$ = 38.63/41 \\
$\Gamma $    & $2.27 \pm 0.17$ \\
Line: $\s_{\rm E}$; E(keV); EW (keV)   &  $0.0$ (f); $6.46 \pm 0.55$;  $1.87 \pm 0.60$ \\
\hline
\par
{\bf D}: 
mekal+pl+Gauss & $\chi^2/\nu$ = 33.46/39 \\
$kT$ (keV)        & $0.23 \pm 0.05$   \\
$Z$ $(Z_\odot)$   & $1.0$ (f)  \\
$\Gamma $    & $2.13 \pm 0.19$ \\
Line: $\s_{E}$; E(keV); $EW$ (keV)   &  $0.0$ (f); $6.48 \pm 0.11$;  $1.66 \pm 0.50$ \\
\hline
\end{tabular}
\end{table}