\begin{table}%t8
\caption{\label{Tab3}\label{histo_summary}Characteristics of the HSS~BCG~sample.
}
%\centering
\par
\begin{tabular}{llrrr}
\hline\hline 
 Parameter          &  Number   & Mean  &Median  &80\%~~~~    \\
                    &  of BCGs  &       &        &interval~   \\
\hline 
$B_{\rm tot}$ (mag) & 506       & 17.66 &17.81   & 16.51, 18.59~ \\
$M_{B}$       (mag) & 506       &--17.25&--17.40 &--15.40, --18.89\\
$V_{\rm hel}$ (\kms)& 506       & 8471  &8752    & 2695, 14~976    \\
{\it EW}(5007)(\AA)       & 502       & 122   &113     & 33, 524~~    \\ 
 \hline
\end{tabular}
\end{table}