\begin{table}%t2
%\centering
\par
\caption{Properties of the $cz$ distribution and significance levels of
  shape estimators for various subsamples of A3921. ${C}_{\rm BI}$ and
  ${S}_{\rm BI}$ are the mean velocity and the velocity dispersion of the
  different distributions (biweight estimators for location and scale,
  Beers et~al. \cite{Beers90}).\label{ROST_Tab}}
\begin{tabular}{cccccccc}
\hline
\hline    
Subsample & $N_{\rm gal}$ & ${C}_{\rm BI}$ & ${S}_{\rm BI}$ & Skewness & AI & 
Kurtosis &TI \\
 & & [km~s$^{-1}$] &  [km~s$^{-1}$]  & \% & \% & \% & \%\\
\hline
%\multicolumn{8}{c}{ }\\  
Whole sample & 104 & $\rm 28~047 ^{+76} _{-77}$ & $\rm 831 ^{+100} _{-76}$ & 
$\geq$10 & $>$20 & $\leq$10 & $\leq$1   \\
%\multicolumn{8}{c}{ }\\
A3921-A & 41 & $\rm 28~017 ^{+145} _{-173}$ & $\rm 1008 ^{+156} _{-106}$ & $>$10 
& $>$20 & $>$20 &$>$20\\
%\multicolumn{8}{c}{ }\\
A3921-B & 20 & $\rm 27~920  ^{+88} _{-86}$ & $\rm 451 ^{+215} _{-80}$ & $<$10 & 
$<$5 & $>$20 & $>$10 \\
\hline
\end{tabular}
\end{table}