\begin{table}%t2 \caption{\label{t:xfit}X-ray spectral parameters of RBS1774. The errors quoted correspond to 90\%~confidence intervals.} \par \small%\centerline { \begin{tabular}{rlllllll} \hline \hline %&&&&&&& \\[-8pt] No. & Model & $N_{\rm H}$ & $kT_{\rm bb}^\infty$ & $E_{\rm line}$ & $\sigma_{\rm line}$ & $\tau_{\rm line}$/Norm$_{\rm line}$ & $\chi^2_\nu$ (d.o.f.) \\ & & ($10^{20}$ cm$^{-2}$) & (eV) & (eV) & (eV) & (\# cm$^{-2}$ s$^{-1}$) & \\ \hline %&&&&&&& \\[-8pt] (1) & bbody & $\rm 1.85^{+0.17}_{-0.17}$ & $103.5\pm0.8$ & & & & 1.81(311) \\ (2) & bbody*gabs & $\rm 1.84^{+0.20}_{-0.17}$ & $105.1\pm0.9$ & $\rm 0.731^{+0.008}_{-0.013}$ & $\rm 27^{+16}_{-4}$ & $\rm 6.5^{+1.2}_{-1.0}$ & 1.50(308)\\ (3) & bbody*gabs & $\rm 3.92^{+0.75}_{-0.50}$ & $102.7\pm0.8$ & $\rm 0.733^{+0.008}_{-0.012}$ & $\rm 34^{+11}_{-11}$ & $\rm 7.3^{+1.3}_{-1.0}$ & \\ & \phantom{bbody*gabs}+gaussian& & & $0.31$ & $0.03$ & $\rm 1.7^{+0.8}_{-0.5} \times 10^{-3}$ & 1.23(307) \\ (4) & bbody & $\rm 1.62^{+0.16}_{-0.14}$ & $103.9\pm0.9$ & & & & 1.55(661) \\ (5) & bbody*gabs & $\rm 1.64^{+0.17}_{-0.15}$ & $105.2\pm0.1$ & $\rm 0.729^{+0.004}_{-0.007}$ & $\rm 23^{+20}_{-19}$ & $\rm 4.8^{+1.7}_{-1.6}$ & 1.42(658) \\ (6) & bbody$+$bbody & $\rm 1.4^{+0.4}_{-0.4}$ & $104$! & \\ & & & $40$! & &&& 1.05(349) \\ \hline \end{tabular}} \medskip Lines (1)--(3) are combined fits to EPIC-pn and EPIC-MOS spectra in the energy interval $0.2{-}1.5$~keV. Lines~(4) and~(5) represent combined fits to EPIC and RGS using the same models as in lines~(1) and~(2). Line~(6) lists the finally accepted two-component blackbody fit to the RGS-data alone with a fixed ratio of normalization parameters. \end{table}