\begin{table}%t4
\caption{\label{tab:feabund}Total counts (lines + continuum) in the interval 10$-$30~\AA~band vs. Fe abundance.}
%\centerline
{
\begin{tabular}{c@{\hspace{8mm}}ccccc@{\hspace{8mm}}c}
\hline\hline
                                     & \multicolumn{5}{c}{$N_{\rm pred}$} & \multicolumn{1}{c}{$N_{\rm obs}$} \\
${\rm Fe/Fe_{\odot}}^{a}$ & 0.05 & 0.07 & 0.10 & 0.15 & 0.20   &       \\
\hline
RGS1                                 & 2298 & 1841 & 1498 & 1232 & 1099   &  1377 \\
RGS2                                 & 2886 & 2379 & 1998 & 1702 & 1554   &  1874 \\
\hline
\end{tabular}}
\smallskip
$^{a}$ Abundance referred to the solar photospheric value from \citet{AndersGrevesse1989}.
\end{table}