\begin{table}%t3
\caption {\label{double}Results of fitting the EPIC data with a double power law with fixed total atomic and molecular column density. The two power laws have photon indices $\Gamma^1$ and $\Gamma^2$ and unabsorbed flux densities at 1~keV $F^1_{\rm 1 ~ keV}$ and $F^2_{\rm 1 ~ keV}$, respectively.}       
%\centering
\par
\begin{tabular}{c c c c c c c c}  
\hline\hline 
\noalign{\smallskip}           
Date & $N_{\rm H}$ & $\Gamma^1$ & $\Gamma^2$ & $F^1_{\rm 1 ~ keV}$ & $F^2_{\rm 1 ~ keV}$ & $F_{\rm 2-10 ~ keV}$  & $\chi^2/\nu$ ($\nu$) \\
 & [$10^{21} ~ \rm cm^{-2}$]&  &            & [$\mu$Jy]            & [$\mu$Jy]            & [$\rm erg ~ cm^{-2} ~ s^{-1}$] &   \\     
 (1) & (2) & (3) & (4) & (5) & (6) \\
\hline                                   
July 10--11, 2007  & 3.40 & 2.48 & 1.72 & 1.63 & 1.14 & $9.76 \times 10^{-12}$ & 0.939 (1346)\\
December 5, 2007   & 3.40 & 2.58 & 1.67 & 1.26 & 0.90 & $7.77 \times 10^{-12}$ & 1.013 (1249)\\
January 8, 2008    & 3.40 & 2.48 & 1.51 & 1.45 & 0.73 & $8.69 \times 10^{-12}$ & 0.880 (1380)\\
\hline
\end{tabular}
\end{table}