\begin{table}%t1
%\centering
\par
\caption{\label{log}The log of all analysed observations and exposure times.}
\begin{tabular}{llll}
\hline\hline
\textbf{Date} & \textbf{Mission} & \textbf{Instrument} & \textbf{$\vec{T}_{\bf exp}$ (ks)}  \\ 
\hline  
05/30/1999 & BeppoSAX & \textsc{mecs} & 47\\ 
&  & \textsc{pds} & 56\\ 
\hline  
11/20/1999 & BeppoSAX & \textsc{mecs} & 15\\ 
&  & \textsc{pds} & 34\\ 
\hline  
05/03/2000 & BeppoSAX & \textsc{mecs} & 46\\ 
&  & \textsc{pds} & 31\\ 
\hline
05/27/2001 & BeppoSAX & \textsc{mecs} & 61\\ 
&  & \textsc{pds} & 38\\
\hline 
05/29/2001 & XMM-\textit{Newton} & \textsc{epic-pn} & 30\\ 
\hline
\end{tabular} 
\end{table}