\begin{table}%t3 
\par
\caption{\label{tbl:plines}Parameters of the strongest emission lines.}                   
 %\centerline
 {           \begin{tabular}{l c c c c c c c c c c c c}            
\hline                    
\hline
\noalign{\smallskip}
 & $\lambda_{\rm C}$ & EW   & \multicolumn{2}{c}{Flux\tablefootmark{a}}\\ 
 & (\AA)       & (m\AA) & \multicolumn{2}{c}{($\times$10$^{-4}$)}\\ 
\hline\\[-2.2ex]
Ne~X~Ly$\alpha$\tablefootmark{c}       &  12.131[11]   &  125[18]  & 2.15[31] & (1.26~$\pm$~0.16) \\ [0.2ex] 
O~VIII~Ly$\beta$\tablefootmark{c}     &  15.997[41]   &   40[14]  & 0.55[20] & (0.31~$\pm$~0.16) \\ [0.2ex]
O~VIII~Ly$\alpha$\tablefootmark{c}    &  18.9796[49]  &  360[28]  & 3.93[31] & (1.71~$\pm$~0.26) \\ [0.2ex]
O~VII~$r$$^b$             &  21.60[90]    &  163[19]  & 1.72[20] & (0.77~$\pm$~0.28) \\ [0.2ex]
O~VII~$i$$^b$             &  21.78[92]    &  149[19]  & 1.58[20] & (0.79~$\pm$~0.40) \\ [0.2ex]
O~VII~$f$$^b$             &  22.097\tablefootmark{d}   &   $<$32   & $<$0.3   & (0.13~$\pm$~0.16) \\ [0.2ex]
N~VII~Ly$\alpha$\tablefootmark{c}      &  24.79[99]    &  296[17]  & 2.76[16] & (0.61$\pm$~0.03) \\ [0.2ex]
N~VI~$r$\tablefootmark{c}              &  28.81[90]    &  $<$230   & $<$2     & ... \\ [0.2ex]
N~VI~$i$\tablefootmark{c}              &  29.09[95]    &  $<$169   & $<$1.4   & ... \\ [0.2ex]
N~VI~$f$\tablefootmark{c}              &  29.531\tablefootmark{d}   &  $<$10    & $<$0.08 & ... \\ [0.2ex]
C~VI~Ly$\alpha$\tablefootmark{d}       &  33.736[64]   &  201[29]  & 1.37[20] & ... \\ [0.2ex]
\hline
                              \end{tabular} }
\tablefoot {
\tablefoottext{a}{Total flux in line, in units of photons~cm$^{-2}$~s$^{-1}$; in parenthesis are shown the values derived by \citet{Smith04} from Chandra.}
\tablefoottext{b}{From RGS1.}
\tablefoottext{c}{From RGS2.}
\tablefoottext{d}{Frozen parameter. Quoted errors are at~90\% confidence level.}}
\end{table}