\begin{table}%tb1
 \caption{\label{tabb1}{\small XSPEC} best-fit parameters 
   for the galactic nucleus (No.~63 in Table~\ref{taba1}). Here and hereafter, the Galactic line-of-sight column density has been fixed at $4.0\times 10^{20}$~cm$^{-2}$.}
%\centering
\par
\begin{tabular}{@{}lr} 
\hline
\hline \\ 
\multicolumn{2}{c}{model: wabs$_{\rm Gal}$ $\times$ wabs $\times$ powerlaw  }\\  
\hline \\ 
$n_{\rm H}~(\times 10^{21}$~cm$^{-2})$  & $\rm 1.25^{+0.80}_{-0.93}$   \\ 
$\Gamma$       & $\rm 1.45^{+0.16}_{-0.24}$ \\
$K_{\rm pl}~(\times 10^{-5})$    & $\rm 1.9^{+0.3}_{-0.5}$ \\ 
\hline \\ 
$\chi_\nu^2$~(d.o.f.) &  1.06~(49)  \\ 
$L_{\rm{0.3-8}}~(\times 10^{38}$~erg~s$^{-1})$ & $\rm 2.3^{+0.2}_{-0.1}$  \\
\hline 
\end{tabular}     
\end{table}