\begin{table}%t2 
\caption{Fluxes of the soft \mbox{X-ray} lines found in the RGS spectrum.}\label{table:lines} 
%\centerline
 {\begin{tabular}{c c c c c}
\hline\hline     \noalign{\smallskip}           
Transition & $\lambda$ (lab) & Flux$^1_{ FWHM = 0}$  & $\Delta$C  & Flux$^2_{\it FWHM{\rm (OVIII)}}$ \\ -- &  ($\AA$) &  ph~m$^{-2}$~s$^{-1}$  &     --         & ph~m$^{-2}$~s$^{-1}$ \\
\hline 
 FeXVII             &    17.073  &  $<$0.05        & $\Delta{  C}=1$  &   $0.06\pm0.04$    \\   
OVII He$\beta$      &    18.627  &  $<$0.03        & $\Delta{ C}=0$  &  $0.06\pm0.04$    \\     OVIII Ly$\alpha$    &    18.969  &  $0.20\pm0.04$   & $\Delta{  C}=31$ &  $0.27\pm0.05$   \\  
OVII He$\alpha$ (r) &    21.600  &  $0.10\pm0.06$   & $\Delta{  C}=4$  &  $0.17\pm0.08$    \\
OVII He$\alpha$ (i) &    21.790  &  $0.26\pm0.08$   & $\Delta{  C}=21$ &  $0.31\pm0.09$    \\
OVII He$\alpha$ (f) &    22.101  &  $0.17\pm0.07$   & $\Delta{  C}=12$ &  $0.16\pm0.07$     \\ 
NVII    Ly$\alpha$  &    24.781  &  $0.13\pm0.05$   & $\Delta{C}=12$ &  $0.18\pm0.05$     \\
CVI Ly$\beta$       &    28.446  &  $0.13\pm0.06$   & $\Delta{C}=13$ &  $0.20\pm0.07$     \\
CVI Ly$\alpha$      &    33.736  &  $0.15\pm0.06$   & $\Delta{C}=8$  &  $0.24\pm0.07$       \\
 \hline 
\end{tabular}}
\medskip
1) Line width fixed to ${\it FWHM}=0$;  2) line width fixed to ${\it FWHM}=2200$~km~s$^{-1}$.   The energy centroids were fixed to the laboratory value in both cases. The column with the improvement in terms of $\Delta$C refers to the detection significance for the fit with the zero-width lines. 
\end{table}