\begin{table}%t1
\caption{\label{observations}Observation summary.}
%\centerline
 {
\small \begin{tabular}{lcccc}
\hline\hline
ID    & XMM name         & Obs.date     & Exp. time & $S/N$   \\
      &                  &              & mn       &       \\
\hline
%%
1703  & J005818.3-355548 & Oct. 23 2006 & 60        & 32.1  \\
1774  & J005922.8-360933 & Oct. 26 2006 & 45        &  3.6  \\
1778  & J005929.7-361113 & Oct. 28 2006 & 30        & 34.0  \\
3654  & J022416.7-050323 & Oct. 29 2006 & 55        & --     \\
3716  & J022456.2-050801 & Oct. 24 2006 & 40        &  2.5  \\
3773  & J022536.4-050012 & Oct. 24 2006 & 30        & 84.7  \\
3776  & J022537.8-050223 & Oct. 24 2006 & 40        & --     \\
3777  & J022538.2-050806 & Oct. 25 2006 & 45        & 118.0 \\
3778  & J022538.3-050423 & Oct. 29 2006 & 30        & 3.4   \\
4009  & J023613.5-523036 & Oct. 23 2006 & 40        & 131.4 \\
4298  & J030927.5-765223 & Oct. 28 2006 & 40        & 4.5   \\
4379  & J031256.5-765039 & Oct. 29 2006 & 30        & 9.4   \\
4481  & J031723.1-442056 & Oct. 28 2006 & 40        & 4.5   \\
4736  & J031829.8-441140 & Oct. 29 2006 & 45        & 23.7  \\
4765  & J031845.0-441042 & Oct. 23 2006 & 55        & 11.4  \\
4927  & J033831.4-351421 & Oct. 25 2006 & 40        & 6.8   \\
5570  & J043306.5-610760 & Oct. 24 2006 & 55        & 3.3   \\
5663  & J043333.5-612427 & Oct. 24 2006 & 40        & 2.3   \\
7355  & J055940.7-503218 & Oct. 24 2006 & 45        & 2.7   \\
7400  & J060014.9-502230 & Oct. 24 2006 & 30        & --     \\
12~281 & J201329.7-414737 & Oct. 27 2006 & 45        & 79.2  \\
12~308 & J201345.0-563713 & Oct. 23 2006 & 30        & 2.0$^1$   \\
13~137 & J213758.7-143611 & Oct. 23 2006 & 30        & 61.6  \\
14~402 & J221726.0-082531 & Oct. 26 2006 & 30        & 2.6   \\
14~541 & J222110.0-244749 & Oct. 28 2006 & 40        & --     \\
14~608 & J222804.4-051751 & Oct. 29 2006 & 45        & --     \\
15~022 & J225149.3-175225 & Oct. 23 2006 & 30        & 153.7 \\
15~393 & J231421.6-424559 & Oct. 24 2006 & 40        & 4.0   \\
15~584 & J231851.8-423114 & Oct. 25 2006 & 30        & 2.9   \\
15~631 & J232454.9-120459 & Oct. 28 2006 & 45        & 1.9   \\
15~867 & J235340.6-102420 & Oct. 23 2006 & 30        & 3.2   \\
15~892 & J235405.7-101829 & Oct. 27 2006 & 45        & 1.3   \\
15~926 & J235418.1-102013 & Oct. 28 2006 & 40        & 14.3  \\
15~997 & J235629.1-343743 & Oct. 25 2006 & 30        & 2.0$^1$   \\
\hline
\end{tabular}}
\medskip
 $S/N$ of the Mg~I~b2 line.
\end{table}