\begin{table}%t1
\caption{Best-fit parameters to the EPIC-pn simulated X-ray spectra
shown in Fig.~\ref{fig:spettri} and obtained in the low and high
statistics cases, \mbox{respectively}.}\label{tab:fit}
%\centering
\par
\begin{tabular}{llllll}
\hline
\hline
cnts & $n_{\rm H} \pm \Delta n_{\rm H}$   & $T \pm \Delta T$ & {\it EM} $\pm$ $\Delta$ {\it EM}     & $\chi^{2}$ & Prob.$^a$\\
       & $(10^{22}$ cm$^{-3})$  & ($10^{6}$ K)     & ($10^{52}$ cm$^{-3})$ & \\
\hline
$ 83 $ & $1.50 \pm 0.36 $ & $ 3.7 \pm 2.2$ & $ 1.4 \pm 6.0$ & $0.56$ & $0.73$\\
$10^4$ & $1.37 \pm 0.02 $ & $ 3.7 \pm 0.1$ & $ 1.3\pm 0.3 $ & $0.68$ & $1.00$\\
\hline
\noalign{\smallskip}
\multicolumn{4}{l}{$^a$ Null hypothesis probability.}\\
\end{tabular}
\end{table}