\begin{table}%T2
\caption{Best-fit values for the black-body and power-law normalizations, when the four spectra are fitted simultaneously with common values of $N_{\rm H}$ ($(5.8\pm0.1)\times10^{21}$~cm$^{-2}$), $\Gamma$ ($1.60\pm0.02$) and $kT_{\rm BB}$ ($1.36^{+0.04}_{-0.03}$~keV). Errors are at a 90\% confidence level for a single interesting parameter.}\label{4spectra_common}
%\centerline
{\small
\begin{tabular}{c|cccc} \hline\hline
Spectral            &   \multicolumn{4}{c}{Phase Interval}                                          \\
Parameter           &   A                   &   B                   &   C                   &   D           \\ \hline
$R_{\rm BB}^{a}$    &   $76\pm3$        &   $130\pm2$           &   $121\pm2$           &   $87\pm2$  \\
$I_{\rm PL}^{b}$    &   $\rm 2.24^{+0.07}_{-0.03}$  &   $\rm 3.25^{+0.05}_{-0.03}$       &   $\rm 1.32^{+0.03}_{-0.06}$      &   $\rm 0.89^{+0.01}_{-0.03}$  \\
$f_{\rm TOT}^{c}$   &   2.04                &   3.42                &   1.77                &   1.06        \\
$f_{\rm PL}^{c}$    &   1.69        &   2.46            &   1.00            &   0.67     \\
 & (83\%) & (72\%) & (56\%) & (63\%) \\
$f_{\rm BB}^{c}$    &   0.35        &   0.96            &   0.77            &   0.39     \\
 & (17\%) & (28\%) & (44\%) &(37\%) \\ \hline
\end{tabular}}
\medskip
$^{a}$ Radius of the blackbody component (in metres) for a source distance of 2.5~kpc.\\
$^{b}$ Intensity of the power-law component in units of $10^{-3}$~ph~cm$^{-2}$~s$^{-1}$~keV$^{-1}$ at 1~keV.\\
$^{c}$ Unabsorbed flux in the energy range 0.3$-$10~keV, in units of $10^{-11}$~erg~cm$^{-2}$~s$^{-1}$.
\end{table}