\begin{table}%t1
\caption{Numbers of stars at various selection steps as a function of relative
parallax error. The three~BB2k columns show: number of RHB~sample stars found,
total number of measurements, number of stars that are fainter than 7.3~mag, the completeness limit of the \hip~mission. \label{startab}}
%\centering
\par
\begin{tabular}{cccccc}
\hline
\hline
\delpi & HIP & RHBs & \multicolumn{3}{c}{BB2k} \\
& & & stars & meas. & $>$7.3 mag \\
\hline
$\leq$$10$\% & 17~295 & 547 & 455 & 480 & 0 \\
$\leq$$15$\% & 28~700 & 1393 & 828 & 890 & 28 \\
$\leq$$20$\% & 38~114 & 2241 & 1044 & 1127 & 103 \\
$\leq$$25$\% & 45~622 & 3084 & 1215 & 1313 & 211 \\
$\leq$$30$\% & 51~231 & 3795 & 1327 & 1437 & 305 \\
\hline
\end{tabular}
\end{table}