\begin{table}%T5
%\centering
\par
\caption{Best-fit parameters of the power-law plus three Gaussians
model reproducing the [22$-$24]~\AA~ Mkn~421 spectra taken by the \mbox{RGS-1}.
The error bars refer to the 90\% confidence intervals.}
\label{2224-tab}
\begin{tabular}{cccc}\hline\hline
\multicolumn{4}{c}{RGS-1 [22.5$-$24.5]~\AA}\\
\hline
Feature & $\lambda$ & {\it FWHM}  & $k$  \\
number  &  (\AA)    & (m\AA) & (cts cm$^{-2}$ s$^{-1}$~\AA$^{-1}$)\\
\hline
\multicolumn{4}{c}{ToO observation}\\
\hline
9 & $22.770\pm0.001$ & $9\pm1$ & $-0.011\pm0.003$ \\
10 & $23.510\pm0.007$ & $\rm 64^{+13}_{-12}$ & $-0.004\pm0.001$ \\
\hline
\multicolumn{4}{c}{Archival data}\\
\hline
9 & $\rm 22.789^{+0.003}_{-0.002}$ & $15.5\pm5$ & $-0.225\pm0.0665$ \\
10 & $23.510\pm0.013$ & $\rm 64^{+26}_{-20}$ & $-0.082\pm0.029$ \\
\hline
\multicolumn{4}{c}{Total}\\
\hline
9 & $22.778\pm0.001$ & $\rm 6^{+2}_{-1}$ & $-0.304\pm0.086$ \\
10 & $23.510\pm0.007$ & $\rm 71^{+13}_{-11}$ & $-0.133\pm0.020$ \\ 
\hline
\end{tabular}
\end{table}