\begin{table}%t2
\caption{Proper motions of Cha H$\alpha$~2.}
\label{table:2}
\small%\centerline
$$ {
\begin{tabular}{lr@{~$\pm$~}lr@{~$\pm$~}l}
\hline\hline
Source &  \multicolumn{2}{c}{PM RA}    & \multicolumn{2}{c}{PM Dec}  \\
       &  \multicolumn{2}{c}{[mas/yr]} & \multicolumn{2}{c}{[mas/yr]}\\
\hline
USNO-B1 (a) & --20  &17   & --14  &4   \\
PSSPMC (b)  & --23  &17   &  +1  &17  \\
SSS-FORS1   & --19.4&14.9 & --0.3 &14.9\\
SSS-SofI    & --23.0&14.1 & +7.8 &14.1\\
Mean        & --21.8&8.8  & +3.2 &8.8 \\
\hline
\end{tabular}}$$
\medskip
Remarks: (a) This value \citep{2003AJ....125..984M} was not used in the 
final proper motion due to its unreasonably small error of PM in declination,
which makes it inconsistent with the measurements using the SuperCOSMOS Sky Survey in comparison to data from the New Technology Telescope (NTT) instrument Son of ISAAC (\mbox{SSS-SofI}). (b)~From the Pre-main Sequence Stars Proper Motion Catalog \citep{2005AetA...438..769D}.
\end{table}