\begin{table}%TA.2
%\centering
\par
\caption{Best-fit parameters of the ToO RGS and EPIC-PN spectra
fitted with power-law and broken power-law models, 
in the common energy range ([0.6$-$1.77]~keV).
The absorption parameter was fixed to the Galactic value.
Systematic errors of 3\% and of 0.5\% were added to the 
RGS and to the  EPIC-PN data, respectively.
The error bars refer to the 90\% confidence interval for one parameter.
 $^a$ erg~cm$^{-2}$ s$^{-1}$.}
\label{rgs-pn-tab}
\begin{tabular}{ccccccc}
\hline\hline
 Inst. & $\alpha_1$ & $E_b$ & $\alpha_2$ &  $F_{1 ~\rm keV}$ & $F_{0.6-1.5~\rm  keV}$ & $\chi^2_r/\rm d.o.f.$ \\
      &           & (keV) &    & ($\mu$Jy) & ($\times 10^{-10}$)$^a$  & \\ 
\hline
\multicolumn{7}{c}{November 14, 2003}\\
\hline
RGS-1 & $0.97\pm0.01$ & & & 188.3 & 4.17 & 1.13/246 \\
RGS-1 & $0.76\pm0.07$ & $\rm 0.80^{+0.05}_{-0.03}$ & $\rm 1.03^{+0.03}_{-0.02}$ & 192.3 &  4.18 & 0.91/244\\
RGS-2 & $0.97\pm0.01$ & & & 176.4 & 3.91 & 1.11/330\\
RGS-2 & $\rm 0.75^{+0.09}_{-0.12}$ & $0.78\pm0.04$ & $1.02\pm0.02$ & 180.0 & 3.90 & 1.0/328\\
PN & $1.34\pm0.01$ & & & 202.3 & 4.35 & 6.6/45\\
PN & $\rm 1.23^{+0.02}_{-0.03}$ & $1.02\pm0.06$ & $1.43\pm0.02$ & 207.2 & 4.35  & 0.81/43 \\
\hline
\end{tabular}
\end{table}