\begin{table}%t3
\caption{Swift XRT spectral fits. Quoted errors are 90\% confidence on 1
  interesting parameter.\label{table_xrt}}
%\centerline
{\begin{tabular}{ccc}
\hline\hline
 & \multicolumn{1}{c}{GRB050126} & \multicolumn{1}{c}{GRB050219a} \\
 \hline
& \multicolumn{2}{c}{Model 1: $wa*po^{\dagger}$ - all$^{a}$} \\
\noalign{\medskip}
Mode             & PC only        &     WT+PC+LrPD  \\
gal$N_{\rm H}$      & $5.3\times10^{20}$     &  $8.5\times10^{20}$  \\
$\Gamma$         & $\rm 2.26^{+0.26}_{-0.25}$ & $\rm 1.90^{+0.17}_{-0.16}$ \\
$N_{\rm excess}$     &  -- & $1.34^{+0.51}_{-0.47}\times10^{21}$ \\
$\chi^{2}_{\nu}$/{\rm d.o.f.} &  8.2/8 & 55/52  \\
\hline
& \multicolumn{2}{c}{Model 2: $wa*po^{\dagger}$ - all tied$^{b}$} \\
\noalign{\medskip}
Mode              &  PC only &         WT only \\
gal$N_{\rm H}$       &  $5.3\times10^{20}$   & $8.5\times10^{20}$  \\
$\Gamma$          &  $\rm 2.42^{+0.33}_{-0.31}$ & $\rm 1.97^{+0.17}_{-0.16}$ \\
$N_{\rm excess}$  &  --                   &
 $1.53^{+0.52}_{-0.49}\times10^{21}$ \\
$\chi^{2}_{\nu}$/{\rm d.o.f.}  &  8.6/6    & 66/49 \\
\hline
& \multicolumn{2}{c}{Model 3: $wa*po^{\dagger}$ - untied$^{c}$} \\
\noalign{\medskip}
Mode              & PC only            &  WT only    \\
gal$N_{\rm H}$       &  $5.3\times10^{20}$ & $8.5\times10^{20}$ \\
$\Gamma_{\rm pre}$    &  $\rm 2.59^{+0.38}_{-0.35}$ & $\rm 1.98^{+0.18}_{-0.16}$ \\
$\Gamma_{\rm post}$   &  $\rm 1.72^{+0.65}_{-0.60}$ & $\rm 1.89^{+0.26}_{-0.23}$ \\
$N_{\rm excess}$  & --                  & $1.49^{+0.53}_{-0.48}\times10^{21}$ \\
$\chi^{2}_{\nu}$  & 5.0/5              & 66/48 \\
\hline
\end{tabular}
}\medskip
\par
\noindent $\dagger$ Here we use the standard XSPEC notation where $wa*po$
means absorbed powerlaw.\newline  
\noindent $^a$ all -- simultaneous fit to all data;
$^b$ all tied -- simultaneous fit to pre- and post-break spectra
with the photon index in each part of the spectrum tied together;
$^c$ untied -- simultaneous fit to pre- and post-break spectra
allowing $\Gamma$ and $N_{\rm excess}$ where applicable to freely vary between
the pre- and post-break data.
\end{table}