\begin{table} %t2	
 \caption{\label{grb050406:tab_specfits}Spectral fit results.} 	
 %\centerline
{ 	
 \begin{tabular}{lllllll} 
 \hline 
 \hline 
   Spectrum	& Photon index	 		& 	$N_{\rm H}$	 & $\chi^{2}_{\rm red}$ (d.o.f.) & C-stat (\%)$^{{a}}$  
		& Start time                    & End time  \\
 		& 	 	 		& ($10^{20}$ cm$^{-2}$)  & 	 & & (s since $T_0$) 	&   (s since $T_0$) 	   \\
 \hline 
BAT total		&$\rm 2.63_{-0.36}^{+0.42}$	&	...	& 1.4 (56) &...	&  --2.560	& 4.160   \\
BAT $T_{90}$		&$\rm 2.64_{-0.38}^{+0.46}$	&	...	& 1.3 (56) &...	&  --2.432	& 3.648   \\
BAT $T_{50}$		&$\rm 2.65_{-0.48}^{+0.61}$	&	...	& 1.0 (56) &...	&  --0.064	& 2.048   \\
BAT peak		&$\rm 2.65_{-0.60}^{+0.82}$	&	...	& 0.9 (56) &...	&   0.064	& 1.024   \\
  \hline 
 XRT~   WT 		&$\rm 2.11_{-0.28}^{+0.31}$ & 2.8$^{{b}}$	             & 1.0 (6) & ... &  92	             & 596   \\
XRT~WT+PC~		&$\rm 2.12_{-0.23}^{+0.25}$ & 2.8$^{{b}}$	             & 1.0 (8) & ... &  92	             & 599   \\
XRT~   PC~		&$\rm 2.13_{-0.19}^{+0.44}$ & 2.8$^{{b}}$	             & ...                 & 220.7 (58.0) & 99	             & 599   \\
XRT~   PC$^{{c}}$ &$\rm 2.06_{-0.24}^{+0.24}$   & 2.8$^{{b}}$	& ...     & 270.7 (67.1) & 599 	& 18308   \\
   \hline
  \end{tabular}}
  \smallskip
   $^{{a}}$  Cash statistic (C-stat) and percentage of Monte Carlo realizations 
			 that had statistic $<$ C-stat. We performed $10^4$ simulations.\\ 
   $^{{b}}$ Fixed to the Galactic value.\\ 
   $^{{c}}$ Snapshots 1 through 4, with the exclusion of the first~$\sim$$600$~s 
			(non piled-up data). 
   \end{table}