\begin{table}%t2
\par
\caption {\label{tab:chi2prob}{Characteristics of observations and $\chi^{2}$ probabilities.}}
%\centerline
 {\begin{tabular}{lccccccc}
\hline
\hline
Object & $\Delta$ {\it RV}$^a$ & $\overline\mathit{RV}_{\rm weighted}$$^b$ & No. obs.$^c$ & Min. $\Delta$t & Max. $\Delta$t & {\it p} & \\
                     & [km~s$^{-1}$] & [km~s$^{-1}$] & & [days] & [days] &\\
\hline
Cha~H$\alpha$~1    & 0.24 & 16.27 $\pm$ 0.52 & 3 & 20 & 2113 & 8.3 $\times 10^{-1}$ \\
Cha~H$\alpha$~2    & 0.15 & 16.25 $\pm$ 0.49 & 3 & 20 & 2113 & 8.7 $\times 10^{-1}$ \\
Cha~H$\alpha$~3    & 0.99 & 14.86 $\pm$ 0.89 & 3 & 19 & 2111 & 5.6 $\times 10^{-2}$ \\
Cha~H$\alpha$~4    & 0.21 & 14.85 $\pm$ 0.43 & 11 & 1 &  701 & 1.0  \\
Cha~H$\alpha$~5    & 0.13 & 15.59 $\pm$ 0.48 & 3 & 19 & 2111 & 8.7 $\times 10^{-1}$ \\
Cha~H$\alpha$~6    & 0.28 & 16.52 $\pm$ 0.56 & 3 & 19 & 2112 & 6.3 $\times 10^{-1}$ \\
Cha~H$\alpha$~7    & 0.58 & 17.09 $\pm$ 0.98 & 2 & 19 &   19 & 1.5 $\times 10^{-1}$ \\
Cha~H$\alpha$~8    & 1.38 & 16.62 $\pm$ 0.67 & 11 & 3 & 2542 & 0.0 & vari. \\
Cha~H$\alpha$~12   & 0.96 & 15.29 $\pm$ 0.93 & 3 & 20 & 2113 & 5.6 $\times 10^{-3}$ \\    
B~34                & 0.07 & 15.74 $\pm$ 0.42 & 6 & 6 & 2083 & 1.0  \\
CHXR~74             & 2.39 & 16.71 $\pm$ 0.81 & 13 & 1 & 2285 & 0.0 & vari. \\
\hline
\end{tabular}}
\par
\smallskip
$^a$ {Half peak-to-peak {\it RV} differences;}
$^b$ {the error of the weighted mean takes an uncertainty of 400~m~s$^{-1}$ into account for the
zero point of the velocity;}
$^c$  {includes data from Table~\ref{tab:rvs}, Joergens (\cite{Joergens06}a), and 
Joergens \& M\"uller (\cite{Joergens07}).}
\end{table}