\begin{table}%t2
%%%\centering


\par
\caption{\label{fits} Results for power law fits for \Xvingt in the energy band $0.2{-}8.0$~keV.}
\begin{tabular}{lcccc}
 \hline \hline\noalign{\smallskip}
\multicolumn{1}{c}{Detector} &
\multicolumn{1}{c}{$N_{\rm H}$} & \multicolumn{1}{c}{$\Gamma $} &
\multicolumn{1}{c}{Normalization} & \multicolumn{1}{c}{$\chi^2_{\rm red}$/d.o.f.} \\
\multicolumn{1}{c}{  } & \multicolumn{1}{c}{(1)}
&\multicolumn{1}{c}{ } & 
\multicolumn{1}{c}{ (2) } & \multicolumn{1}{c}{}\\
\noalign{\smallskip} \hline \noalign{\smallskip}
 PN & $2.94\pm0.32$ &
   $1.53\pm0.02$ & $0.87\pm0.15$ & 1.08/528\\
 PN & galactic &
   $1.49\pm0.01$ & $0.83\pm0.07$ & 1.11/529\\
  MOS1 & $2.34\pm0.80$ &
   $1.27\pm 0.03$ & $0.95\pm0.03$ & 1.08/188\\
 MOS1 & galactic &
   $1.27\pm 0.02$ & $0.94\pm 0.02$ & 1.07/189\\
   MOS2 & $0.55\pm0.41$ &
   $1.27\pm 0.03$ & $0.91\pm0.03$ &1.28/189\\
 MOS2 & galactic &
   $1.33\pm0.02$ & $0.97\pm0.02$ & 1.34/190\\
 MOS1+MOS2 & $1.36\pm0.52$ &
   $1.27\pm0.03$ & (a) & 1.23/383\\
 MOS1+MOS2 & galactic &
   $1.30\pm0.02$ & (a) & 1.24/384\\
\hline
\end{tabular}
\begin{flushleft}
 The errors given are at the 90\% level.\\
$^{(1)}$  In units of $10^{20}$~cm$^{-2}$;
 $N_{\rm H}^{\rm gal}=2.10\times 10^{20}$~cm$^{-2}$. \\
$^{(2)}$  Normalization at 1~keV in 10$^{-3}$ ph/keV/cm$^2$/s. \\
$^{(a)}$  Different normalizations for the individual detectors.
\end{flushleft}
\end{table}