\begin{table}%t2
\caption{The apparent speed and the corresponding apparent proper motion of components~C2, C3, C4 and~C5.}\label{tab:kinematics}
%\centering
\par
\begin{tabular}{ccc}
\hline \hline
Component & Apparent speed & Apparent proper motion \\
 &  ${\rm mas~yr}^{-1}$ & in units of $c$ \\
\hline
C2 & $\left( -0.3 \pm 4.0 \right) \times 10^{-3}$ & $\le$$0.31 $\\
C3 & $0.082 \pm 0.006$ & $6.25\pm 0.46$ \\
C4 & $0.14 \pm 0.03$ & $9.91 \pm 2.12$ \\
C5 & $0.22 \pm 0.03 $ & $16.77 \pm 2.29$ \\
\hline
\end{tabular}
\end{table}