\begin{table}%t1
%\centering
\par
\caption{%Overview of 
\xmm\ observations of RX J0720.4-3125.\label{obs}}
   \begin{tabular}{ccccc}
   \hline\hline
	Orbit & Observation & Date & Julian date & Duration (ks) \\
\hline 
	0078 & 0124100101 & 13-05-2000 & 2~451~677.9 & 65 \\
	0175 & 0132520301 & 21-11-2000 & 2~451~870.3 & 30 \\
	0533 & 0156960201 & 06-11-2002 & 2~452~585.4 & 30 \\
	0534 & 0156960401 & 08-11-2002 & 2~452~498.5 & 32 \\
	0622 & 0158360201 & 02-05-2003 & 2~452~762.5 & 81 \\
	0711 & 0161960201 & 27-10-2003 & 2~452~940.5 & 45 \\
\hline
   \end{tabular}
\end{table}