\begin{table}%t1
  %\centering
\par
  \caption{\label{tbl-1}Mean coordinates, $cz$, velocity dispersion, density and number of elements
 of clusters and groups in the H density bin, with $N \geq 20 $~members.}%\vspace*{-2mm}
\begin{tabular}{lrcccccc}
\hline
\hline
 & NGC & $\langle {\rm RA}\rangle$ & $\langle {\rm Dec}\rangle$ & $\langle cz\rangle$ &  $\sigma_v$ & $\delta_{1,~1000}^{\max}$& $N$ \\
 & & deg & deg & $\rm km~ s^{-1}$ &  $\rm km~ s^{-1}$ &  \\ 
\hline
Coma   & 4889   &   194.157  & 27.87 & 6972 & 940 & 60.4& 750   \\
A1367  & 3842   &   176.243  & 19.93 & 6494 & 762 & 27.7& 220   \\
grp-1  & 4065   &   181.069  & 20.46 & 7055 & 401 & 16.7& 155	\\   
grp-2  & 3937   &   178.039  & 20.71 & 6659 & 294 & 12.0& 83	\\   
grp-3  & 128-34 &   182.027  & 25.30 & 6707 & 349 &  9.0& 78	\\   
grp-4  & 4555   &   189.024  & 26.85 & 7083 & 415 &  7.6& 64	\\   
grp-5  & 4104   &   181.556  & 28.14 & 8410 & 450 &  8.9& 62	\\   
grp-6  & 4295   &   185.054  & 28.47 & 8069 & 320 &  6.6& 51	\\   
grp-7  & 3910   &   177.616  & 21.36 & 7874 & 207 & 11.8& 43	\\   
grp-8  & 4213   &   183.787  & 24.01 & 6753 & 268 &  4.7& 26	\\   
\hline
\end{tabular}\vspace*{3mm}
\end{table}