\begin{table}%t1 
%\centering
\par
\caption{\label{tab:samples}Composition of different subsamples of NGC~7129.}
\begin{tabular}{ccccccccc}  
 \hline\hline
\multicolumn{3}{c}{------- Sample characteristics -------}         & \multicolumn{2}{c}{Class~II} & \multicolumn{2}{c}{Class~III} & \multicolumn{2}{c}{Total} \\ 
$M>0.5~M_\odot$   & $A_{\rm V} < 5$~mag & core   & $N$ & ($N_{\rm det}/N_{\rm u.l.}$) & $N$ & ($N_{\rm det}/N_{\rm u.l.}$) & $N$ & ($N_{\rm det}/N_{\rm u.l.}$) \\ \hline
$\surd$ &         &         & 26 & (13/13) & 25 & (25/0) & 51 & (38/13) \\
$\surd$ & $\surd$ &         & 13 & (9/4)   & 21 & (21/0) & 34 & (30/4)  \\
$\surd$ &         & $\surd$ & 16 & (7/9)   & 16 & (16/0) & 32 & (23/9) \\
$\surd$ & $\surd$ & $\surd$ &  7 & (5/2)   & 14 & (14/0) & 21 & (19/2) \\
\hline
\end{tabular}
\end{table}