\begin{table}%t2
\caption{Unidentified XSS sources.}\label{xss_noids}
%\centerline
{
\begin{tabular}{lll}
\hline
\hline
\multicolumn{1}{c}{XSS source} &
\multicolumn{1}{c}{Hardness} &
\multicolumn{1}{c}{Counterpart from RASS}
\\   
\multicolumn{1}{c}{(J2000.0)} &
\multicolumn{1}{c}{ratio} &
\multicolumn{1}{c}{Bright Source Catalog}
\\     
\hline
00050$-$6904 &  $0.46\pm0.11$ & \\ 
00564+4548   &  $0.52\pm0.08$ & 1RXS J005528.0+461143\\
02087$-$7418 &  $0.86\pm0.23$ & \\       
05188+1823   &  $0.70\pm0.34$ & \\                      
12270$-$4859 &  $0.52\pm0.13$ & 1RXS J122758.8$-$485343\\   
13563$-$7342 &  $0.46\pm0.26$ & \\
14101$-$2936 &  $1.19\pm0.47$ & \\   
14138$-$4022 &  $0.46\pm0.23$ & \\ 
14239$-$3800 &  $0.51\pm0.21$ & 1RXS J142149.8$-$380901\\
14353$-$3557 &  $0.59\pm0.33$ & \\ 
14495$-$4005 &  $0.45\pm0.15$ & \\ 
15360$-$4118 &  $0.63\pm0.29$ & \\
16049$-$7302 &  $0.76\pm0.32$ & \\ 
16537$-$1905 &  $0.70\pm0.24$ & \\
17223$-$7301 &  $0.37\pm0.27$ & 1RXS J171850.0$-$732527$^{\rm a}$\\
17576$-$4534 &  $0.63\pm0.30$ & \\
18486$-$2649 &  $0.43\pm0.24$ & \\
19303$-$7950 &  $0.49\pm0.24$ & 1RXS J194944.6$-$794519\\
\hline             
\end{tabular}}
\medskip
$^{a}$ Possibly associated with star Tyc 9288-744-1 ($V=9.8$).  
\end{table}