\begin{table}%t2
\caption{\label{t:continuum}Best-fit continuum parameters for a phenomenological model. }
%\centerline
{
\begin{tabular}{llll}
\hline\hline
\noalign{\smallskip}
&& PN & MOS2\\
\hline
$T_{\rm mbb}$ & keV & $0.16\pm0.02$ & $0.12\pm0.02$\\
$\Gamma_1$ & &$2.08\pm0.01$ & $2.03\pm0.02$\\
$\Gamma_2$ & &$1.75\pm0.01$ & $1.82\pm0.03$\\
$E_0$ & keV& $2.31\pm0.04$ & $2.0\pm0.1$\\
$\chi^2/\nu$ && 281/234 & 262/208\\
\hline
\end{tabular}}
\par
\tablefoot{\epi\ and MOS2 fitted separately. The reduced $\chi^2$ refer here to the final best fit.}
\end{table}