\begin{table}%t1
   	 \caption{Details of the XMM-Newton X-ray observations.}
   	    \label{Log}
   	    %\centering
\par
	 \begin{tabular}{c c c c} % 4 columns 	 
         \hline\hline
	Obs ID     & Start Date & \multicolumn{2}{c}{exposure times (s)}\\   
        	   &            & EPIC pn & EPIC MOS 1 and 2     \\
         \hline
	0106660101 & 2000-11-17 &  55~718 &  2$~ \times ~$57~824  \\
	0106660201 & 2000-11-18 &  50~618 &  2$~ \times ~$52~724  \\
        0106660401 & 2001-11-18 &     0   &  2$~ \times ~$33~050  \\
	0106660501 & 2001-11-17 &   8208 &  2$~ \times ~$10~822  \\
	0106660601 & 2001-11-17 & 106~808 &  2$~ \times ~$109~422 \\
	\hline                  
	\end{tabular}
	\end{table}