\begin{table}%t4
\caption{Parameters for the models of Table~\ref{powermodels} with lower \rchisq\ (second and third models) during the three pointings. The H~column is given in units of~$10^{22}~\rm cm^{-2}$. Energies and temperatures are given in~keV.}
\label{param_po_models}
%\centering
\par
\begin{tabular}{llccc}
\hline
\hline 
Model & Param. & XTE-1997  & SAX-1998  & XTE-2001 \\
\hline
highecut(po) & $N_{\rm H}$ & 4.5 $\pm$ $0.4$ &
1.1 $\pm$ $0.3$ & 4.6 $\pm$ $0.1$\\
& $E_{{\rm cut}}$ & 7.6 $\pm$ $0.4$ & 7.8 $\pm$ $0.5$ & 4.3 $\pm$ $0.3$ \\
& $E_{{\rm fold}}$ & 16.3 $\pm$ $1.2$ & 11 $\pm$ $3$ & 20 $\pm$ $2$ \\
& $\Gamma$ & 1.6 $\pm$ $0.1$ & 1.0 $\pm$ $0.2$ & 1.6 $\pm$ $0.1$\\
%& & & & \\
po + bb  & $N_{\rm H}$ & 4.4 $\pm$ $0.4$ & 1.0 $\pm$ $0.3$ & 4.8 $\pm$ $0.5$ \\  
& {\it kT} & 2.16 $\pm$ $0.08$ & 1.74 $\pm$ $0.11$ & 2.4 $\pm$ $0.1$ \\
& $\Gamma$ & 1.96 $\pm$ $0.04$ & 1.53 $\pm$ $0.14$ & 2.0 $\pm$ $0.1$\\
\hline 
\end{tabular}
\end{table}