\begin{table}%t8
\caption{Means and standard deviations of the isolation parameters for the CIG and comparison samples.}
\label{tab:stat}
%\centering
\small
\begin{tabular}{l c c c c}
\hline \hline
               &  CIG  &  KTG  &  HCG  &  ACO\\
\hline
mean($\eta_k$) & 1.378 & 1.863 & 2.722 & 3.430\\
std($\eta_k$)  & 0.556 & 0.629 & 1.105 & 0.676\\
mean($Q$)      & --2.720 & --1.222 & --0.026 & --0.380\\
std($Q$)       & 0.760 & 0.866 & 0.726 & 0.710\\
mean($Q_{\rm Kar}$)& --3.142 & --1.251 & --0.034 & --0.644\\
std($Q_{\rm Kar}$) & 0.689 & 0.884 & 0.738 & 0.621\\
\hline
\end{tabular}
\end{table}