\begin{table}%t2
%\centering
\par
\caption{Galactic $N_{{\rm H}}$ and corresponding unabsorbed flux in the band
0.1--2~keV for 1 count/s, assuming a  thermal bremsstrahlung spectral model with
$kT = 5$~keV.\label{nh}}
\begin{tabular}{lc}
\hline \hline
$N_{\rm H}$ (cm$^{-2}$) & CF (erg cm$^{-2}$ count$^{-1}$)\\
\hline  
$1 \times 10^{20}$ & $3.7 \times 10^{-11}$\\
$2 \times 10^{20}$ & $4.1 \times 10^{-11}$\\
$5 \times 10^{20}$ & $4.9 \times 10^{-11}$\\
$8 \times 10^{20}$ & $5.5 \times 10^{-11}$\\
$3 \times 10^{21}$ & $9.3 \times 10^{-11}$\\
\hline  
\end{tabular}
\end{table}