\begin{table}%T1
%%\centering
\par
\caption{ROSAT-PSPC observations of the Pleiades.}
\begin{tabular}{clccc}
\hline\hline
\multicolumn{1}{c}{Obs. id.} &\multicolumn{1}{c}{Obs. seq.}&\multicolumn{1}{c}{Elapsed
time}&\multicolumn{1}{c}{Start} & \multicolumn{1}{c}{End}  \\
& &\multicolumn{1}{c}{(ks)}&\multicolumn{1}{c}{date} &\multicolumn{1}{c}{date}   \\
\hline
1 & rp200008a00&2022.822  & 9-Feb.-91& 4-Mar.-91 \\
2 & rp200068a00&1984.662  & 9-Feb.-91& 4-Mar.-91  \\
3 & rp200008a01&80.081 & 21-Aug.-91 &22-Aug.-91\\
4 & rp200068a01& 86.143 & 22-Aug.-91 &23-Aug.-91\\
5 & rp200556n00& 71.185 & 6-Sep.-91 &7-Sep.-91  \\
6 & rp200557n00& 82.704 & 5-Sep.-91 &6-Sep.-91  \\
7 & rp200008a02& 185.855 & 27-Aug.-92 &29-Aug.-92  \\
\hline
\end{tabular}
\label{Tab1}
\end{table}