\begin{table}%t5
\caption{Radio-optical galaxy counts.}\label{tab:mo03}
%\centering
\par
 \begin{tabular}{l|rrr|rr}
\hline\hline
  Mag interval    &  $N_{{\rm rg}}$   & $N_{{\rm gal}}$     & \%              & \%              &       \%         \\ 
                  &\multicolumn{3}{c|}{   (A3558-C)}              & (A2255)         &   Other clusters \\
\hline 
$-21 < M_R \le -20$ &   3       &   88.4      &  3.4\% $\pm$ 2.0    &  7.2\% $\pm$ 2.7  &   1.6\% $\pm$ 1.4  \\
$-22 < M_R \le -21$ &   9       &   37.8      & 23.8\% $\pm$ 7.9    & 15.3\% $\pm$ 4.8  &  20.3\% $\pm$ 12.8 \\
$M_R \le -22$       &   6       &   13.7      & 43.8\% $\pm$ 17.9   & 56.5\% $\pm$ 21.3 &  23.3\% $\pm$ 23.1 \\
\hline
\end{tabular}
\end{table}