\begin{table}%TA.1
%\centering
\par
\caption{Best-fit parameters of the RGS spectra reproduced
with power-law, broken power-law and parabolic models.
We fixed the absorption parameter to the Galactic value.
The error bars refer to the 90\% confidence interval.
$^a$ erg~cm$^{-2}$~s$^{-1}$.
}
\label{rgs-bband-spec}
\begin{tabular}{ccccccc}
\hline\hline
 Inst. & $\alpha_1$ & $E_b$ & $\alpha_2$ &  $F_{1 ~\rm keV}$ & $F_{0.5-1.5~\rm keV }$ & $\chi^2_r/\rm d.o.f.$ \\
     &            & (keV) &            & ($\nu$Jy) & ($\times 10^{-10}$)$^a$  & \\ 
\hline
\multicolumn{7}{c}{Exp. 0136540301}\\
\hline
 RGS-1 & $0.99$ &  & & 101.9 & 2.71 & 3.26/127\\
 RGS-1 & $\rm 0.755^{+0.055}_{-0.035}$ & $\rm 0.74^{+0.1}_{-0.03}$ & $\rm 1.27^{+0.11}_{-0.04} $ & 104.9 & 2.72 & 0.91/125 \\
 RGS-2 & $1.05$ & & & 92.4 & 2.48 & 4.24/125\\
 RGS-2 & $0.81\pm0.03$ & $\rm 0.80^{+0.02}_{-0.03}$ & $\rm 1.46^{+0.04}_{-0.06}$ & 97.3 & 2.51 & 0.90/125 \\  
\hline
\multicolumn{7}{c}{Exp. 0136540401}\\
\hline
 RGS-1 & $0.93$ & & & 120.1 & 3.16 & 3.89/137\\
 RGS-1 & $\rm 0.63^{+0.03}_{-0.06}$ & $\rm 0.69^{+0.02}_{-0.04}$ & $\rm 1.20^{+0.03}_{-0.04}$ & 123.2 & 3.19 & 0.94/135\\
 RGS-2 & $0.94$ & & & 115.9 & 3.05 & 2.52/144\\
 RGS-2 & $\rm 0.77^{+0.04}_{-0.02}$ & $\rm 0.79^{+0.03}_{-0.05}$ & $1.18\pm0.04$ & 121.0 & 3.07 & 1.21/142\\
\hline
\multicolumn{7}{c}{Exp. 0136541001}\\
\hline
RGS-1 & $0.90$ & & & 72.8 & 1.91 & 2.83/227\\
RGS-1 & $0.64\pm0.02$ & $\rm 0.67^{+0.03}_{-0.02}$ & $1.11\pm0.02$ & 75.0 & 1.92 & 0.92/225\\
RGS-2 & $0.92$ & & & 68.7 & 1.81 & 2.5/240\\ 
RGS-2 & $\rm 0.74^{+0.03}_{-0.02}$ & $\rm 0.76^{+0.03}_{-0.04}$ & $\rm 1.17^{+0.02}_{-0.04}$ & 71.6 & 1.82 & 0.97/238\\
\hline
\multicolumn{7}{c}{Exp. 0158970101}\\
\hline 
RGS-1 & 1.06 & & & 74.0 & 1.98 & 3.5/138\\
RGS-1 & $0.80\pm0.04$ & $\rm 0.71^{+0.02}_{-0.04}$ & $\rm 1.33^{+0.03}_{-0.04}$ & 75.3 & 2.00 & 1.16/136\\
RGS-2 & 1.10 & & & 68.5 & 1.85 & 2.3/139\\
RGS-2 & $\rm 0.92^{+0.03}_{-0.04}$ & $0.76\pm0.05$ & $1.35\pm0.04$ & 71.2 & 1.86 & 0.83/137\\
\hline
\multicolumn{7}{c}{Exp. 0150498701}\\
\hline
RGS-1 & $0.80$ & & & 186.5 & 4.83 & 3.17/454\\
RGS-1 & $0.56\pm0.02$ & $0.71\pm0.02$ & $1.015\pm0.015$ & 192.4 & 4.87 & 1.13/452\\
RGS-2 & 0.82 & & & 174.3 & 4.52 & 2.42/490\\
RGS-2 & $0.64\pm0.02$ & $0.73\pm0.02$ & $\rm 1.02^{+0.01}_{-0.02}$ & 179.8 & 4.56 & 1.08/488\\
\hline
\multicolumn{7}{c}{Parabolic model}\\
\hline
   & $a$ &  & $b$ &   &  &  \\
\hline
\multicolumn{7}{c}{Exp. 0136540301}\\
\hline
RGS-1 & $\rm 1.21^{+0.02}_{-0.03}$ & & $0.77\pm0.08$ & 110.9 & 2.74 & 1.02/126\\
RGS-2 & $\rm 1.33^{+0.02}_{-0.03}$ & & $\rm 0.96^{+0.06}_{-0.1}$ & 101.2  & 2.52 & 1.1/126\\
\hline
\multicolumn{7}{c}{Exp. 0136540401}\\
\hline
RGS-1 & $ 1.17^{+0.02}_{-0.03}$ & & $\rm 0.86^{+0.05}_{-0.09}$ & 131.5 & 3.21 & 1.11/136\\
RGS-2 & $\rm 1.10^{+0.02}_{-0.03}$ & & $\rm 0.58^{+0.05}_{-0.09}$ & 125.4  & 3.08 & 1.36/143\\
\hline
\multicolumn{7}{c}{Exp. 0136541001}\\
\hline
RGS-1 & $\rm 1.09^{+0.01}_{-0.04}$ & & $\rm 0.67^{+0.04}_{-0.07}$ & 79.3 & 1.93 & 1.07/226\\
RGS-2 & $\rm 1.10^{+0.01}_{-0.02}$ & & $\rm 0.60^{+0.05}_{-0.06}$ & 74.5 & 1.83 & 1.13/239\\
\hline
\multicolumn{7}{c}{Exp. 0158970101}\\
\hline
RGS-1 & $\rm 1.28^{+0.02}_{-0.03}$ & & $\rm 0.77^{+0.06}_{-0.08}$ & 80.6 & 2.01 & 1.33/137\\
RGS-2 & $1.29\pm0.02$ & & $\rm 0.65^{+0.06}_{-0.09}$ & 74.3 & 1.87 & 0.91/138\\
\hline
\multicolumn{7}{c}{Exp. 0150498701}\\
\hline
RGS-1 & $0.96\pm0.01$ & & $\rm 0.65^{+0.05}_{-0.03}$ & 204.0 & 4.91 & 1.25/453\\ 
RGS-2 & $\rm 0.97^{+0.01}_{-0.02}$ & & $\rm 0.53^{+0.03}_{-0.04}$ & 188.6 & 4.57 & 1.25/489\\
\hline
\end{tabular}
\end{table}