\begin{table}%t1
%\centering
\par
    \caption{Best-fit parameters for the absorbed power-law model of the HETGS spectra of \igr~and 
    for the absorbed power-law plus thermal component of the HETGS, PCA, and \cha~zeroth-order spectra. 
\nh~is the column density in units of $10^{21}$~cm$^{\rm -2}$;
    $kT_{\rm in}$ is the inner temperature of the thermal (DISKBB) component; 
 d.o.f. = degrees of freedom (the decrease in d.o.f. in the combined HEG/MEG and PCA spectrum is due to the 
 heavy rebinning we performed in the HETGS data, see text); in all the fits we fixed  HEG, MEG and zeroth-order 
 normalisation factors to 1.
  The indicated errors are at 1$\sigma$. \label{tab:all}}
    %\vspace{1em}
    \begin{tabular}[h]{lll}
      \hline
      \hline
 &  HEG / MEG & HEG / MEG / PCA \\
      \hline
\nh & 4.3 $\pm$ 0.4& $4.3 {+0.7 \atop -0.5}$ \\
$\Gamma$ &  2.06 $\pm$ 0.07 & $1.7\pm0.08$\\
$kT_{\rm in}$ &    & $0.42 {+0.07 \atop -0.06}$~keV \\
PCA norm & & 1.13\\
 reduced \chis & 0.79 (431 d.o.f.) & 0.9 (161 d.o.f.) \\
\hline
\hline
 & HEG / MEG & \\
 & PCA  / 0th order& \\
\hline
\nh & $3.9{+0.5 \atop -0.4}$ & \\
$\Gamma$ & 1.7~$\pm$~0.04& \\
$kT_{\rm in}$ & 0.40~$\pm$~0.06~keV & \\
PCA norm & 1.13 &\\ 
reduced \chis & 1.15 (293 d.o.f.) & \\
 \hline
    \end{tabular}
    \label{tab:grating}
 \end{table}