\begin{table}%t4
\caption{Unabsorbed X-ray luminosity and emission measure 
         for the stars in the sample with known parallax. 
         \label{tab:selected}}
\small
%\centerline
 {\begin{tabular}{l r c c}
\hline\hline
%Star & \multicolumn{1}{c}{paralax} & $\log{EM_{1}}$ & $\log{L_{\rm X}}$ \\
%     & \multicolumn{1}{c}{(mas)}   &   (cm$^{-3}$)  &    (erg s$^{-1}$)    \\
Star & \multicolumn{1}{c}{Distance} & $\log{EM}^{*}$ & $\log{L_{\rm X}}$ \\
(XBSS $\dots$) & \multicolumn{1}{c}{(pc)} & (cm$^{-3}$) & (erg s$^{-1}$) \\
\hline
%__________________________________________________________________
%J001002.4+110831   &  10.04 & 54.30 & 29.94 \\
%J001749.7+161952   &  21.66 & 52.33 & 28.56 \\
%J080309.8+650807   &   8.77 & 52.77 & 29.17 \\
%J110320.1+355803   & 392.52 & 51.21 & 26.49 \\
%J123600.7$-$395217 &  14.91 & 53.56 & 29.88 \\
%J212635.8$-$445046 &   8.76 & 53.81 & 29.37 \\
%J213840.5$-$424241 &  12.94 & 52.49 & 28.71 \\
%J224833.3$-$511900 &  25.16 & 52.73 & 28.65 \\
%J231541.2$-$424125 &  10.09 & 52.67 & 28.91 \\
J001002.4+110831   &  99.60 & 54.30 & 29.94 \\
J001749.7+161952   &  46.17 & 52.33 & 28.56 \\
J080309.8+650807   & 114.02 & 52.77 & 29.17 \\
J110320.1+355803   &   2.55 & 51.21 & 26.49 \\
J123600.7$-$395217 &  67.07 & 53.56 & 29.88 \\
J212635.8$-$445046 & 114.16 & 53.81 & 29.37 \\
J213840.5$-$424241 &  77.28 & 52.49 & 28.71 \\
J224833.3$-$511900 &  39.75 & 52.73 & 28.65 \\
J231541.2$-$424125 &  99.11 & 52.67 & 28.91 \\
%__________________________________________________________________
\hline
\end{tabular}}
\par
\smallskip
    \noindent
    {\small $^{*}$ For those stars where more than one thermal
                   component has been fitted to the X-ray spectrum,
                   $EM$ is the emission measure of the first component.}
\par
\end{table}