\begin{table}%t2
\caption{\label{2spectra_common}Best-fit values for the black-body and power-law parameters, when the two spectra are fitted simultaneously with common values of $N_{\rm H}$, $\Gamma$, and $kT_{\rm BB}$ (\textit{case 1}) or with common values of $N_{\rm H}$, $kT_{\rm BB}$, and $R_{\rm BB}$ (\textit{case 2}).}
\par
%\centerline
{
\begin{tabular}{c|cc|cc} \hline\hline
Phase & \multicolumn{2}{c}{Case 1} & \multicolumn{2}{c}{Case 2} \\
interval & A & B &	A & B \\ \hline
$N_{\rm H}$		& \textit{$\it 1.4^{+0.6}_{-0.5}$}		& \textit{$\it 1.4^{+0.6}_{-0.5}$}		& \textit{2.3 $\pm$ 1.0}		& \textit{2.3 $\pm$ 1.0}		\\ \hline
$\Gamma$		& \textit{$\it -0.2^{+0.3}_{-0.9}$}		& \textit{$\it -0.2^{+0.3}_{-0.9}$}		& $\rm 0.51^{+0.35}_{-0.57}$		& $\rm 0.09^{+0.37}_{-0.66}$		\\
$I_{\rm PL}$		& $\rm 1.2^{+2.0}_{-1.0}$			& $\rm 2.4^{+3.2}_{-2.0}$			& $\rm 6.0^{+5.1}_{-4.8}$			& $\rm 4.3^{+4.1}_{-3.2}$			\\
$f_{\rm PL}^{a}$	& 1.5 (39 \%)				& 2.9 (60 \%)				& 2.0 (51 \%)				& 2.9 (61 \%)				\\ \hline
$kT_{\rm BB}$ (keV)	& \textit{$\it 1.21^{+0.07}_{-0.06}$}	& \textit{$\it 1.21^{+0.07}_{-0.06}$}	& \textit{$\it 1.25^{+0.13}_{-0.09}$}	& \textit{$\it 1.25^{+0.13}_{-0.09}$}	\\
$R_{\rm BB}$ (m)	& $\rm 160^{+11}_{-8}$			& $\rm 147^{+16}_{-19}$			& \textit{$\it 137^{+13}_{-21}$}		& \textit{$\it 137^{+13}_{-21}$}		\\
$f_{\rm BB}^{a}$	& 2.3 (61 \%)				& 2.0 (40 \%)				& 1.9 (49 \%)				& 1.9 (39 \%)				\\ \hline
$f_{\rm TOT}^{a}$	& 3.8					& 4.9					& 3.9					& 4.8					\\
$\chi^{2}_{\nu}$/d.o.f. & \multicolumn{2}{c}{0.99/115} & 	\multicolumn{2}{c}{0.96/115} \\ \hline
\end{tabular} }
\par
\medskip
$^{a}$ Unabsorbed flux in the energy range 0.2--10 keV, in units of $10^{-12}$~erg~cm$^{-2}$~s$^{-1}$.
\end{table}