\begin{table}
  \caption{\label{tab:obs}Regions observed with VIMOS.}
  %\centerline
{
  \begin{tabular}{lllllll}
    \hline\hline\noalign{\smallskip}
    Cluster          & Observing period & RA(J2000) &Dec(J2000)& Distance & $A_{\rm V}$ & Sources \\ 
                     & & [hh:mm:ss]&[dd:mm:ss]& [pc]     & [mag] & [$N$]     \\ 
    \hline                                                                            
    $\sigma$ Orionis & Oct. 2006--Mar. 2007 & 05:38:00 & --02:37:00 & 360     & 0.15  & 216  \\ 
    NGC 6231         & Apr. 2008--Sep. 2008 & 16:54:10 & --41:49:30 & 1240    & 1.36  & 573  \\ 
    NGC 6531         & Apr. 2008--Sep. 2008 & 18:04:13 & --22:29:24 & 1210    & 0.87  & 627  \\ 
    ASCC 58          & Oct. 2006--Mar. 2007 & 10:15:07 & --54:58:12 & 600     & 0.28  & 370  \\ 
    NGC 2353         & Oct. 2006--Mar. 2007 & 07:14:30 & --10:16:00 & 1120    & 0.22  & 316  \\ 
    Collinder 65     & Oct. 2006--Mar. 2007 & 05:26:05 & +15:41:59 & 310     & 0.40  & 198  \\ 
    NGC 6664         & Apr. 2008--Sep. 2008 & 18:36:42 & --08:13:00 & 1440    & 2.20  & 508  \\ 
    \hline
  \end{tabular}}
\par
\tablefoot{The surveyed area for each cluster is
    16\arcmin\  $\times$ 18\arcmin\  centered at the coordinates listed above. The
    limiting magnitude is $V = 21$~mag. MOS observations were carried out with
    the ``HR-Orange'' grism (maximum spectral coverage: 5200--7600~\AA;
    $\lambda / \Delta\lambda$ = 2150) and a slit width of 1$\arcsec$.}  
\end{table}