\begin{table}%t4
%\centering
\par
\caption{\label{eggen}Number of MGs candidates according to Eggen's criteria.}
\begin{tabular}{lcccc}
\hline\hline\noalign{\smallskip}
Group &   Total stars & Both criteria & Only $PV$ & Only $\rho_{\rm c}$ \\
\noalign{\smallskip}\hline\noalign{\smallskip}
Local association  & 29 & 14 & 9  &  1  \\
IC~2391             & 19 &  3 & 7  &  5  \\
Castor             &  7 &  2 & 0  &  4  \\
Ursa Major         & 18 &  6 & 1  &  7  \\
Hyades SC          & 29 &  9 & 5  &  9  \\
\noalign{\smallskip}\hline
\end{tabular}
\end{table}