\begin{table}%t1
\caption{\label{tab1}\textit{Chandra} ACIS best-fit parameters.}
\par
\small%\centerline
 {
\begin{tabular}{l c } 
\hline\hline       
$\Gamma$             &   1.7$^{*}$  \\
$R$       &   $\rm 2.18^{+0.48}_{-0.60}$      \\
$N_{\rm G}$            & $(3.06 \times 10^{20})$ cm$^{-2}$ \\
$N_{\rm H}$            & $(5.28^{+1.04}_{-0.42}) \times10^{23}$ cm$^{-2}$ \\
$n$                    & $(1.83^{+0.51}_{-0.33}) \times10^{-3}$ \\
$n_{\rm unobscured}$     & $(4.48^{+3.43}_{-2.11}) \times10^{-6}$\\ 
$E_{\rm Fe~~}$  (keV)   & $\rm 6.38^{+0.05}_{-0.06}$  \\ 
$F_{\rm Fe~~}$           & $(2.49^{+1.21}_{-1.11})\times10^{-5}$\\
$EW$ (eV)              & $\rm 172^{+84}_{-76}$ \\ 
%& \\[-8pt]
\hline
%& \\[-8pt]
\bf{$\chi^{2}$(d.o.f.)}     &\bf{103(99)}\\
\hline
\multicolumn{2}{l}{Unabsorbed luminosity and absorbed flux} \\
$L_{2-10~{\rm keV}}$ (erg~s$^{-1}$)      &     $7.31  \times10^{43}$ \\
$\rm Flux_{2-10~keV}$ (erg~s$^{-1}$ cm$^{-2}$)&  $2.67 \times 10^{-12}$ \\
\hline                                 
\end{tabular}}
\medskip
* Value fixed. \\
Normalizations $n$ are expressed in cm$^{-2}$~s$^{-1}$~keV$^{-1}$; the normalization of the iron line is expressed in photons~cm$^{-2}$~s$^{-1}$.
\end{table}