\begin{table}%T8
\caption{\label{tbl:stat}Comparison with the results of other surveys for pulsating
sdBs (upper part) and our own survey divided into subsamples (lower part).}
\small%\centering
\par
\begin{tabular}{lrrrrl} \hline\hline\noalign{\smallskip}
Sample   & Size & \multicolumn{2}{c}{Pulsators} & Fract. & Preselection \\
         & \#  & S & C & \%  & on \teff \\
         \hline 
South Africa & $\sim$1200 & 13 & 7 & 1.7 & No \\
Billeres & 74 & 0 & 4 &  5.4 & Yes \\
Dreizler & 12 & 1 & 0 &  8   & Yes \\ 
HS       & 80 & 9 & 0 & 10   & Yes, --comp. \\
HE       & 23 & 0 & 0 &  0   & Yes \\
SPY      & 27 & 3 & 0 & 11   & Yes \\
SDSS     & 40 & 0 & 5 & 12.5 & Yes \\
BG       & 11 & 1 & 0 & 9    & Yes \\
Saffer   & 24 & 1 & 0 & 4    & Yes \\
Maxted   & 24 & 0 & 0 & 0    & Yes \\
colour   & $\sim$50 & 0 & 2 & 4 & Poor \\ \hline 
\end{tabular}\tablefoot{``Size'' indicates the number of targets checked for variability in each
sample. The number of pulsators discovered are separated into
apparently single (S) and spectroscopic composites (C),
but note that binaries with invisible (WD or dM) companions are included
in the column for single pulsators.
We also specify if the sample was preselected to contain only subdwarfs
in the instability region or not.
Note that a few of the pulsators are present in more than one sample, and
that we keep the HS and HE stars observed only as part of the {\sc spy} survey
apart from the HS and HE samples.}
\end{table}