\begin{table}%t2
\caption{Best-fit parameters of the absorbed power-law, broken 
power-law and  parabolic models.  We added a systematic error of~3\% 
to the  imaging mode data (exp. 0136540301, 0136540401 and 0136540701) 
and a systematic error of~1.5\% to the Timing mode data (0136541001).
\label{tab2}}
%\begin{center}
{\begin{tabular}{cccccccc}
\hline\hline
Obs.Id. & $\alpha_1$ & $E_{\rm b}$ & $\alpha_2$ & $F_{1 ~\rm keV}$ & $F_{0.6-2 ~\rm keV}^a$ & $F_{2-10 ~\rm kev}^a$ & $\chi^2_r/\rm d.o.f.$ \\
 & & (keV) & & ($\mu$Jy) & ($\times10^{-10}$) &  ($\times10^{-10}$) & \\
\hline
0136540301  & $1.53\pm0.01$ &  & & 123.8 & 3.34 & 2.25 & 1.21/125\\ 
0136540301  & $\rm 1.31^{+0.1}_{-0.16}$ & $\rm 1.00^{+0.25}_{-0.12}$ & $\rm 1.57^{+0.01}_{-0.02}$ & 128.3 & 3.35 & 2.21 & 0.98/123\\
\hline
0136540401 & $1.41\pm0.01$ & & & 154.8 & 4.20 & 3.31 & 1.40/125\\
0136540401 & $\rm 1.27^{+0.07}_{-0.09}$ & $\rm 1.14^{+0.24}_{-0.16}$ & $1.45\pm0.02$ & 157.1 & 4.21 & 3.25 & 1.20/123 \\
\hline
0136540701 & $1.15\pm0.01$ & & & 153.9 & 4.25 & 4.82 & 1.81/125\\
0136540701 & $1.13\pm0.01$ & $\rm 6.56^{+0.20}_{-0.16}$ & $\rm 2.26^{+0.17}_{-0.23}$ & 153.6 & 4.24 & 4.67 & 1.14/123\\
\hline
0136541001 & $1.535\pm0.003$ & & & 71.1 & 1.92 & 1.28 & 1.68/125\\
0136541001 & $ 1.521\pm0.004$ & $\rm 4.50^{+0.35}_{-0.27}$ & $1.70\pm0.03$ & 71.0 & 1.91 & 1.27 & 0.61/123\\ 
\hline
\multicolumn{8}{c}{Parabolic model}\\
\hline
Obs.Id. & $\alpha$ & & $\beta$ & $F_{1~\rm  keV}$ & $F_{0.6-2 ~\rm keV}^a$ & $F_{2-10 ~\rm kev}^a$ & $\chi^2_r/\rm d.o.f.$ \\
 & &  & & ($\mu$Jy) & ($\times10^{-10}$) &  ($\times10^{-10}$) & \\
\hline
0136540301 & $\rm 1.45^{+0.03}_{-0.02}$ & & $\rm 0.16^{+0.03}_{-0.05}$ & 124.8 & 3.35 & 2.18 & 0.95/124\\
0136540401 & $\rm 1.34\pm0.02$ & & $\rm 0.14^{+0.03}_{-0.04}$ & 155.6 & 4.21 & 3.22 & 1.13/124\\
0136540701 & $\rm 1.16\pm0.02$ & & $\rm 0.02\pm0.01$ & 153.9 & 4.25 & 4.83 & 1.81/124 \\
0136541001 & $\rm 1.503^{+0.005}_{-0.003}$ & & $0.054\pm0.04$ & 71.2 & 1.92 & 1.27 & 1.24/124\\
\hline
\end{tabular} }
$^a$ erg cm$^{-2}$ s$^{-1}$.
\end{table}