\begin{table}%t1
\caption{\label{tab:rms}Percentage of variable stars as a function of magnitude (see text for details, numbers in brackets refer to dwarfs only).}
\small%\centerline
 {
  \begin{tabular}{lrlrlrl}
    \hline\hline
    $R$-mag & \multicolumn{6}{c}{\% variable stars} \\
    & \multicolumn{2}{c}{IRa01} & \multicolumn{2}{c}{LRc01} & 
    \multicolumn{2}{c}{LRa01} \\
    \hline
    11.0 & \multicolumn{2}{c}{--} & \multicolumn{2}{c}{--} &   60 & (63) \\
    11.5 & \multicolumn{2}{c}{--} &   67 & (35) &   62 & (47) \\
    12.0 &   56 & (38) &   68 & (36) &   46 & (42) \\
    12.5 &   42 & (33) &   58 & (27) &   39 & (31) \\
    13.0 &   35 & (30) &   54 & (26) &   31 & (33) \\
    13.5 &   28 & (24) &   37 & (17) &   22 & (25) \\
    14.0 &   20 & (21) &   20 & (14) &   17 & (22) \\
    14.5 &   17 & (19) &    9 &  (9) &   14 & (19) \\
    15.0 &   11 & (13) &    5 &  (8) &   11 & (15) \\
    15.5 &    9 & (11) &    5 &  (6) &   11 & (13) \\
    16.0 &    8 &  (9) &    5 &  (8) & \multicolumn{2}{c}{--} \\
\hline
\end{tabular}}
\medskip
No data is shown for magnitude bins containing fewer than 20~objects.
\end{table}