\begin{table}%t4
\caption{\label{tab:member}The mean cluster radial velocities ($v_{\rm r}$), cluster
centres and radii (see text for details).}
\small%\centering
\par
\begin{tabular}{lrccl}
\hline\hline 
Cluster & $v_{\rm r}$ & \multicolumn{2}{c}{Centre} & Radius \\
        &~\kms  & RA & Dec                   &\\
\hline 
NGC~3293  & $-12\pm5$  & $\rm 10^{h}35^{m}49.3^{s}$  
                    & $-58\degr 13\arcmin 28\arcsec$ & 4.1\arcmin\\
NGC~4755  & $-20\pm5$ & $\rm 10^{h}53^{m}39.0^{s}$ 
                    & $-60\degr 21\arcmin 39\arcsec$ & 5.0\arcmin\\
NGC~6611  & $+10\pm8$ & $\rm 18^{h} 18^{m} 40.0^{s}$ 
                    & $-13\degr 47\arcmin 06\arcsec$ & 4.8\arcmin\\
\hline 
\end{tabular}
\end{table}