\begin{table}%t4
%\centering
\par
\caption{\label{bach}Apparent velocities taken from Bach et~al. (\cite{Bach05}).}
\begin{tabular}{ccc}
\hline\hline
Id. & $\mu\rm [mas/yr]$  & $\beta_{\rm app}$ [$c$] \\
\hline
C1  & 0.86~$\pm$~0.13  & 16.13~$\pm$~2.36        \\
C2  & 0.63~$\pm$~0.10  & 11.87~$\pm$~1.82        \\
C3  & 0.62~$\pm$~0.04  & 11.59~$\pm$~0.76        \\
C4  & 0.44~$\pm$~0.01  &  8.27~$\pm$~0.24        \\
C5  & 0.43~$\pm$~0.02  &  8.16~$\pm$~0.29        \\
C6  & 0.41~$\pm$~0.02  &  7.80~$\pm$~0.33        \\
C7  & 0.37~$\pm$~0.01  &  6.89~$\pm$~0.19        \\
C8  & 0.32~$\pm$~0.01  &  6.04~$\pm$~0.20        \\
C9  & 0.26~$\pm$~0.01  &  4.98~$\pm$~0.27        \\
C10 & 0.24~$\pm$~0.01  &  4.52~$\pm$~0.45        \\
c11 & 0.29~$\pm$~0.02  &  5.48~$\pm$~0.55        \\
\hline
\end{tabular}
\end{table}