\begin{table}%T2
%\centering
\par
\caption{Best-fit model parameters of the combined fit MECS-PDS 
relative to  the MECS extraction radius of $15'$.}\label{t2}
\begin{tabular}{cc}
\hline\hline
\multicolumn{2}{c}{Log-parabolic Model} \\
\hline
$\alpha$  &  1.36 $\pm$ 0.05 \\
$\beta$    & 0.21 $\pm$ 0.03 \\
$K$ ($\times$10$^{-2}$) &  2.08 $\pm$ 0.10 \\
$f_{MP}$   &  0.84 $\pm$ 0.03 \\
 $\chi^2_r$ (d.o.f.) & 0.76 (82) \\
%\hline
%\multicolumn{2}{c}{   } \\
\hline
\multicolumn{2}{c}{Broken power-law  Model} \\
\hline
$\Gamma_1$ & 1.66 $\pm$ 0.01 \\
$\Gamma_2$ & 2.01 $\pm$ 0.05 \\
$E_{\rm b}$ & 12.5 $\pm$ 1.5 \\
$K$ ($\times$10$^{-2}$) & 2.62 $\pm$ 0.06 \\
$f_{MP}$  & 0.84 (fixed) \\
$\chi^2_r$ (d.o.f.) & 0.96 (82) \\
\hline
\end{tabular}
\end{table}