\begin{table}%t1
\caption{The 23 ENACS clusters with galaxy samples 
complete to $M_R = -19.5$ ($H_0 = 100$ km~s$^{-1}$~~Mpc$^{-1}$).} \label{tab1}
%\centerline
{\begin{tabular}{rcrlrr}
\hline\hline
ACO & ${cz_{\rm 3K}}$ & ${\sigma_V}$ & Center & ${ N_{\rm memb}}$ &
    ${N_{\rm type}}$ \\
\hline
   87   &   16~149  &  875 & Geometric     &  17  &   17 \\
  119   &   12~997  &  744 & X-ray         &  63  &   62 \\
  151   &   12~074  &  399 & Density peak  &  15  &   15 \\
  151   &   15~679  &  693 & X-ray         &  37  &   37 \\ 
  168   &   13~201  &  524 & X-ray         &  50  &   50 \\
  548E  &   12~400  &  706 & X-ray         &  43  &   43 \\
  548W  &   12~638  &  819 & X-ray         &  53  &   52 \\
  754   &   16~754  &  769 & X-ray         &  38  &   38 \\
  957   &   13~661  &  691 & X-ray         &  24  &   24 \\
  978   &   16~648  &  497 & cD-galaxy     &  51  &   47 \\
 2040   &   13~974  &  602 & X-ray         &  31  &   31 \\
 2052   &   10~638  &  654 & X-ray         &  25  &   22 \\
 2401   &   16~844  &  475 & cD-galaxy     &  23  &   22 \\
 2734   &   18~217  &  579 & X-ray         &  38  &   38 \\
 2799   &   18~724  &  493 & cD-galaxy     &  34  &   34 \\
 3122   &   19~171  &  780 & Density peak  &  61  &   61 \\
 3128   &   17~931  &  809 & X-ray         & 145  &  145 \\
 3158   &   17~698  &  977 & X-ray         &  87  &   85 \\
 3223   &   17~970  &  597 & cD-galaxy     &  53  &   52 \\
 3341   &   11~364  &  561 & X-ray         &  25  &   25 \\
 3528   &   16~377  & 1040 & X-ray         &  28  &   28 \\
 3651   &   17~863  &  662 & cD-galaxy     &  78  &   78 \\
 3667   &   16~620  & 1064 & X-ray         &  99  &   99 \\
\hline
\end{tabular}}
The columns give: the ACO number, the average velocity of the cluster
in the CMBR reference frame (${cz_{\rm 3K}}$ in km~s$^{-1}$), the global
velocity dispersion of the cluster (${\sigma_{\it V}}$ in km~s$^{-1}$), the way
in which the center of the cluster was determined, the number of
member galaxies in this sample (${N_{\rm memb}}$), and the number of
member galaxies in this sample with a galaxy type (${N_{\rm type}}$),
either from CCD-imaging and/or from the spectrum.
\label{sample}
\end{table}