\begin{table}%t1
\caption{\label{tab1}Mrk 509 XMM-Newton observation log.}     
%\centerline
{ \small        
\begin{tabular}{c c c c c}
\hline\hline             
 N$^{\circ}$ & Obs. ID & Date & Expo & Counts \\
 &   &    &   &  (2-10 keV)\\
  &   &    &  (ks) &  ($\times10^4$)\\
\hline                  
 1 & 0130720101 & 2000 Oct. 25--25 & 20.7 & 7\\
 2 & 0130720201 & 2001 Apr. 20--20 & 23.1 &  10\\
 3 & 0306090101 & 2005 Oct. 16--16 & 2.7 & 1.1\\
 4 & 0306090201 & 2005 Oct. 18--19 & 59.8 & 25\\
 5 & 0306090301 & 2005 Oct. 20--20 & 32.4 & 14\\
 6 & 0306090401 & 2006 Apr. 25--26 & 48.6 & 23\\
\hline                        
\end{tabular}}
\par
\medskip
Number, Observation ID, Observation date, net EPIC pn exposure time, and 
total 2--10~keV counts for the six \emph{XMM-Newton} observations of \object{Mrk~509}.
\end{table}