\begin{table}%t3
\par
\caption{\label{tab:spectral}Results of the X-ray spectral fitting. The errors are at the 90\%~confidence level.}
\small%\centerline
{
\begin{tabular}{l l l l l l}
\hline
\hline
Obs & \nh & $\Gamma$ &  $kT_{\rm bb}$ & $F_{2-10,\rm  unabs.}$  & $\chi^2_\nu$$^\star$ \\ 
    & ($\times10^{22}$ cm$^{-2}$) &  & (keV) & (\ergcms) & (d.o.f.$^\dagger$) \\
\hline
S1  & $\rm 4.0_{-0.8}^{+0.9}$ & $0.9\pm0.2$ & &$3.6 \times 10^{-11}$ & 1.0 (66)\\
    & $2.0\pm0.4$ &  & $2.1\pm0.2$ & $3.0 \times 10^{-11}$ & 0.86 (66)\\
S2  & $\rm 3.4_{-0.8}^{+1.0}$ & $1.0\pm0.3$ & & $3.8 \times 10^{-11}$ & 0.78 (34)\\
    & $1.8\pm0.5$ & & $\rm 1.8_{-0.2}^{+0.3}$ & $3.0 \times 10^{-11}$ & 0.74 (34)\\
X1  & 3.4 (Frozen) & $\rm 1.17_{-0.11}^{+0.14}$ & &$2.65 \times 10^{-11}$ & 0.94 (25)\\
X2  & 3.4 (Frozen) & $\rm 1.0_{-0.2}^{+0.3}$ & & $0.9 \times 10^{-11}$ & 0.49 (10)\\ 
X3  & 3.4 (Frozen) & $1.2\pm0.1$ & &$2.6\times 10^{-11}$  &0.91 (25) \\
X4  & 3.4 (Frozen) & $1.1\pm0.4$ & &$1.1\times 10^{-11}$  & 0.93 (12)\\
S3+X5~& $\rm 3.4_{-1.6}^{+1.5}$ & $\rm 1.2_{-0.4}^{+0.3}$ & & $0.74\times 10^{-11}$ & 0.86 (8)\\
\hline
\end{tabular}}
\smallskip
 $^\star$ Reduced $\chi^2$.\\
 $^\dagger$ Degrees of freedom. 
\end{table}