\begin{table}%t2
%\centering
\par
\caption{The results of fitting to the PN data with two-component models, 
in the 2--12~keV energy range.}\label{table:bbpo}
\begin{tabular}{ccc}
\hline
\hline
  \noalign {\smallskip}
 parameters                          &  {\sc bb+pow}                    &  {\sc diskbb+pow} \\
  \noalign {\smallskip}
\hline
${\cal N}_{\rm H}$                 &   $\rm 2.10^{+0.07}_{-0.06}$   &  $\rm 2.11^{+0.06}_{-0.05}$   \\
{\tiny (10$^{23}$~cm$^{-2}$)}         &                                         &                                       \\
$kT$ (keV)                                  &  $\rm 0.15^{+0.05}_{-0.04}$   &  $\rm 0.16^{+0.04}_{-0.05}$ \\
$\Gamma$                             & $1.89\pm0.05$    &   $1.89\pm0.05$ \\ 
$\chi^{2}$/d.o.f.          &  1078.7/1139                    &  1078.6/1139               \\
\hline
\hline
\end{tabular}
\end{table}