\begin{table}%t5
\caption{Parameters for the comptonization models.}\label{modelstab}
%\centerline
{
\begin{tabular}{llccc}
\hline
\hline
Model & Parameter & XTE 1997 & SAX 1998 & XTE 2001\\
\hline
compTT + bb & $N_{\rm H}(10^{22}~\rm cm^{-2})$& 2.04 $\pm$ 0.12 & 0.30 $\pm$ 0.15 & 4.22 $\pm$ 0.16\\
& $T_{\rm bb}$ & 0.76 $\pm$ 0.04 & 0.73 $\pm$ 0.05& 0.65 $\pm$ 0.04\\
& {\it kT}$_{0}$ & 1.50 $\pm$ 0.06 & 1.26 $\pm$ 0.07 &1.46 $\pm$ 0.06\\
& {\it kT}$_{\rm e}$ & 47.79 $\pm$ 0.06 & 47.48 $\pm$ 0.06 & 46.46 $\pm$ 0.06\\
& $\tau_{\rm p}$ & 0.50 $\pm$ 0.3 & 0.70 $\pm$ 0.3 & 0.46 $\pm$ 0.3\\
& $F_{\rm 2-10~keV}^{(a)}$ & 26.8 & 4.1 & 12.6\\
& $F_{{\rm bol}}^{(c)}$ & 67.0 & 5.4 & 16.5 \\ 
& CR$^{(b)}$ & 0.28 & 0.43 & 0.34 \\
& $\chi^{2}_{\nu}$(d.o.f.)& 0.66 (49) & 1.16 (114) & 0.62 (47)\\
% & \\
BMC & $N_{\rm H}(10^{22}~\rm cm^{-2})$& 0.2 $\pm$ 0.1 & 0.30 $\pm$ 0.15 & 0.2 $\pm$ 0.1 \\
& {\it kT}$_{{\rm col}}$~(keV) & 1.38 $\pm$ 0.09 & 1.09 $\pm$ 0.08 & 1.38 $\pm$ 0.09  \\
& $\alpha$ & 1.4 $\pm$ 0.23 & 0.99 $\pm$ 0.18 & 1.26 $\pm$ 0.15 \\
& $f$ & $\gg$1 & $\gg$1 & $\gg$1 \\
& $A_{\rm N}(\times 10^{-4})$ & 35.3 $\pm$ 0.3 & 5.5 $\pm$ 0.2 &15.7 $\pm$ 0.2 \\
& $F_{\rm 2-10~keV}^{(a)}$ & 24.5 & 4.1 & 9.9\\
& CR$^{(b)}$ & 0.40 & 0.72 & 0.47 \\
& $\chi^{2}_{\nu}$(d.o.f.) & 0.71 (51) & 1.14 (116) & 0.88 (49)\\
\hline
\end{tabular}}
\medskip
$^{(a)}$ Unabsorbed flux in units of 10$^{-11}$ \ergseccm.\\
$^{(b)}$ Computed as $F_{20-60~\rm \kev}$/$F_{3-20~\rm \kev}$.\\
$^{(c)}$ Unabsorbed flux in units of 10$^{-11}$~\ergseccm. The spectral range  is 2--100~\kev\ for RXTE~data and 0.5--100~\kev\ for BeppoSAX data.
\end{table}