\begin{table}%t3
\caption {\label{tab:mag_limits} Saturation limits and limiting
magnitudes at 3$\sigma$ level (see Sect.~\ref{catalog}). 
In the fourth column, the corresponding limiting mass for cluster members 
(i.e. assuming an age between~30 and 50~Myr and a distance of 150~pc) 
derived from the evolutionary models by \citet{Bar98} and \citet{Cha00} is reported; 
in the last column the magnitude corresponding to the Hydrogen burning limit 
($\sim$0.07~$M_{\odot}$) for IC~2391 members is also given for comparison.}
%\centerline
 {\begin{tabular}{ccccc}
\hline\hline
    Filter &  Mag Sat. &  Mag 3$\sigma$ & Mass 3$\sigma$ & PHB$^\dagger$\\
           &           &                &  ($M_\odot$)   &              \\
 \hline
  $V$	  & 10.5 & 24.7 & 0.03  & 20.0 \\
  $R_{\rm C}$   & 10.0 & 23.7 & 0.03  & 18.5 \\
  $I_{\rm C}$   &  9.5 & 23.0 & 0.02  & 17.0 \\
 \hline
\end{tabular}}
\par
\smallskip
$^\dagger$  {PHB = Photometric Hydrogen Burning limit for IC~2391 members.}
\end{table}