\begin{table}%t4
\caption{\label{tab4} Morphological classification of the member galaxies for groups of class A and B.
$T_{\rm spectrum}$ is the morphogical type of the group as defined by the percentage of galaxies
with {\it EW}(H$\alpha)~>~6$~$\AA$.}
%\centerline
{\begin{tabular}{lllll} \hline \hline
Group name                & Members       & $n$\_em$^a$ &  $T_{\rm spectrum}$ &  {\it EW}(H$\alpha$)      \\ \hline
PCG~100355+190454         &  4             & 0         &  early          &        --            \\
PCG~101345+194541         &  4             & 0         &  early          &        --            \\
PCG~103959+274947         &  4             & 1         &  early          & A: 6.05~$\pm$~0.01   \\
PCG~110941+203320         &  3             & 1         &  early          & B: 12.98~$\pm$~0.02 \\
PCG~114233+140738         &  3             & 1         &  early          & B: 7.60~$\pm$~0.02 \\
PCG~114333+215356         &  4             & 3         &  late           & A: 22.06~$\pm$~0.04 \\
                         &                &           &                 & B: 6.89~$\pm$~0.02 \\ 
                         &                &           &                 & C: 8.77~$\pm$~0.03 \\
PCG~121252+223519         &  3             & 2         &  late           & A: 24.45~$\pm$~0.03 \\ 
                         &                &           &                 & B: 21.64~$\pm$~0.06 \\
PCG~130157+191511         &  3             & 3         &  late           & A: 36.6~$\pm$~0.2 \\ 
                         &                &           &                 & C: 202~$\pm$~5 \\ 
                         &                &           &                 & D: 47~$\pm$~2 \\
PCG~130926+155358         &  3             & 1         &  early          & C: 16.60~$\pm$~0.05 \\
PCG~145239+275905         &  3             & 1         &  early          & B: 7.30~$\pm$~0.08 \\
PCG~161754+275834         &  3             & 0         &  early          &        --             \\ \hline
\end{tabular}}\medskip
{$^a$   Number of emitters.}
\end{table}