\begin{table}%t6
%\centering
\par
\caption{\label{bars} Bars in the sample galaxies. The data come from the
RC3 except in the cases that are explained in the text.}
\begin{tabular}{l c c c}
\hline\hline
Sample &  SA & SAB & SB \\
\hline
$\sigma$-drop & 7 $(35\% \pm 11\%)$ & 10 $(50\% \pm 11\%)$ & 3 $(15\% \pm 8\%)$\\
control & 8 $(40\% \pm 11\%)$ & 9 $(45\% \pm 11\%)$ & 3 $(15\% \pm 8\%)$\\
\hline
\end{tabular}
\end{table}