\begin{table}%t2
\caption{
BAT and XRT~spectral analysis results of relative to 5 ad hoc selected intervals of the GRB
evolution (see bottom panel in Fig.~\ref{fig3}). The BAT fluxes in the XRT
band are extrapolated from the best fit models. Quoted errors and upper limits are at the 90\%
confidence level.
}
\label{tab2}
\small%\centering
\par
\begin{tabular}{crrrccccc}
\hline \hline\noalign{\smallskip}
& Interval&\multicolumn{2}{c}{Time (s)} &$N_{\rm H}$ ($10^{22}$~cm$^{-2})$ & $\Gamma$  & $\chi^2_\nu$ (d.o.f.) &\multicolumn{2}{c}{Flux ($10^{-9}$ erg cm$^{-2}$ s$^{-1}$)} \\
&  & Start & Stop & & & & 0.2--10 keV & 15--350 keV \\
\hline
BAT &A    & $-$1.43  & 23.2 & -- & $-$1.19 $\pm$ 0.07  & 0.96 (57)  & 3.1 & 52.8\\
BAT+XRT~&B& 23.2     & 41.6 & 7.5 $\pm$ 1.5& $-$1.37 $\pm$ 0.02 &1.0 (189)& 2.6 &11.9\\
XRT~&C    & 41.6     & 82.3 & 4.7 $\pm$ 1.2& $-$1.63 $\pm$ 0.05 &1.19 (205) &1.33& --\\
XRT~&D    & 82.3     & 224  & $<$2.1 & $-$1.7 $\pm$ 0.1 & 1.24 (22) &0.03 & --\\
XRT~&E    & 628      & 8163 & $<$2.9 & $-$1.74 $\pm$ 0.07 & 1.243 (80) &0.006& --\\
\hline
\end{tabular} 
\end{table}