\begin{table}%t8
%\centering
\par
\caption{Properties of the $cz$ distribution for the different
spectral types. $^*$ In the case of the two separate k+a and k+a?
subsamples we use the classical variance estimator for velocity
dispersion and not the biweight indicator, owing to the low number of
objects (Beers et~al.~\cite{Beers90}).\label{ROST_Tab1}}
\begin{tabular}{cccc}
\hline
\hline
Subsample & $N_{\rm gal}$ & ${C}_{\rm BI}$ & ${S}_{\rm BI}^*$ \\
 & & [km~s$^{-1}$] &  [km~s$^{-1}$]  \\
\hline
%\multicolumn{4}{c}{ }\\
k & 59 & $\rm 27~988 ^{+86} _{-111}$ & $\rm  770^{+119} _{-96}$    \\
%\multicolumn{4}{c}{ }\\
k+a & 6 & $\rm 27~920 ^{+347} _{-386}$ & $\rm 597 ^{+86} _{-62}$  \\
%\multicolumn{4}{c}{ }\\
k+a? & 7 & $\rm 27~839  ^{+1402} _{-305}$ & $\rm 1188 ^{+318} _{-131}$  \\
%\multicolumn{4}{c}{ }\\
k+a + k+a? & 13 & $\rm 27~805  ^{+353} _{-265}$ & $\rm 964 ^{+285} _{-143}$  \\
%\multicolumn{4}{c}{ }\\
e & 11 & $\rm 27~941  ^{+522} _{-219}$ & $\rm 1607 ^{+314} _{-219}$ \\
\hline
\end{tabular}
\end{table}