\begin{table}%t3
 \caption{Best-fit parameters of the 0.3--10~keV spectrum of the X-ray afterglow. The model is an absorbed power~law ({\tt xspec} model: {\sc wabs} {\sc pow}).}
 \label{tab:xspec}
 \small%\centerline
{
 \begin{tabular}{lrrcccc}
 \hline
 \hline
 Interval  & Start time  & Stop time  & $N_{\rm H}$  & $\Gamma_{\rm x}$  & Mean flux  & $\chi^2$/d.o.f.  \\
          & (s)    & (s)  & ($10^{21}$~cm$^{-2}$)  &   & ($10^{-13}$~erg~cm$^{-2}$~s$^{-1}$)  &    \\
 \hline
A  &   7004  &  26~079 & $\rm 4.5_{-1.0}^{+1.3}$ & $\rm 2.05_{-0.24}^{+0.27}$ & $24\pm4$    & 11.0/16\\
B  &  29~217 &  54~833 & $\rm 4.2_{-2.1}^{+3.2}$ & $\rm 2.2_{-0.5}^{+0.6}$    & $6.4\pm1.9$ &  351.5 (63.4\%)$^{a}$\\
C  & 160~010 & 215~648 & $\rm 3.4_{-1.4}^{+1.7}$ & $\rm 2.2_{-0.4}^{+0.5}$    & $5.6\pm1.4$ &  320.4 (58.2\%)$^{a}$\\
BC &  29~217 & 215~648 & $\rm 5.0_{-1.9}^{+1.9}$ & $\rm 2.5_{-0.5}^{+0.6}$    & $4.5\pm1.5$ & 12.4/9\\
BCD&  29~217 & 765~966 & $\rm 5.5_{-1.7}^{+2.1}$ & $2.5\pm0.2$            & $1.9\pm0.1$ & 10.3/13\\
CD & 160~010 & 765~966 & $\rm 4.4_{-1.3}^{+2.1}$ & $2.4\pm0.4$            & $1.1\pm0.4$ &  6.2/7\\
  \hline
  \end{tabular}}
\medskip
$^{a}$ Cash statistics ($C$-stat; Cash 1979)\nocite{Cash79} and percentage of Monte~Carlo realisations that had statistic $<$$C$-stat. We performed $10^4$~simulations. Photons were extracted from a circular region with a 10~pixel radius.
\end{table}