\begin{table}%t3
%\begin{center}
\par
\caption{Limits in mmag for detecting the individual groups of objects. For example
49\% of all CP1 stars can be detected with a 3$\sigma$ limit of +5 mmag. In
addition, the mean group $\overline{\Delta a}$, the maximum values for group
members $\Delta a_{\rm m}$, and the number $N$ of well-established members for the
analysis are listed.}
\label{limits}
\begin{tabular}{lrrrr|rrr}
\hline
\hline
& \multicolumn{1}{c}{+5} & \multicolumn{1}{c}{+10} & \multicolumn{1}{c}{+15} & 
\multicolumn{1}{c}{+20} & \multicolumn{1}{c}{$\overline{\Delta a}$} &  
\multicolumn{1}{c}{$\Delta a_{\rm m}$} & \multicolumn{1}{c}{$N$} \\
\hline
CP1 & 49\% & 17\% & 8\% & 1\% & +3.2 & +22 & 78 \\
CP2 & 98\% & 93\% & 90\% & 79\% & +32.5 & +79 & 108 \\
CP3 & 80\% & 10\% & $-$ & $-$ & +5.3 & +11 & 10 \\
CP4 & 94\% & 94\% & 77\% & 35\% & +18.8 & +36 & 17 \\
I/II & 61\% & 28\% & 17\% & 11\% & +5.4 & +19 & 18 \\
\hline
& \multicolumn{1}{c}{$-$5} & \multicolumn{1}{c}{$-$10} & \multicolumn{1}{c}{$-$15} & 
\multicolumn{1}{c}{$-$20} \\
\hline
$\lambda$ Boo & 95\% & 65\% & 35\% & 20\% & $-$16.2 & $-$35 & 20 \\
Be & 41\% & 12\% & 5\% & $-$ & $-$1.5 & $-$19 & 59 \\
\hline
\end{tabular}
%\end{center}
\par
\end{table}