\begin{table}%T3
\caption{Proper motions in the jet of 0716+714. The number of data points which were used for the fit for each
component is given in Col.~2. The last column gives the back-extrapolated
ejection dates of the components, which result from the linear fits.}
\label{tab:beta_app}
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\begin{tabular}{lrccc}
\hline\hline
Id. & \# & $\mu$ [mas/yr] & \multicolumn{1}{c}{$\beta_{\rm app}\ (z=0.3)$} & Ejection date\\
\hline
 C1 &  4 & $0.86 \pm0.13$ & $16.13\pm2.36$ & $1986.7 \pm1.3$ \\
 C2 &  5 & $0.63 \pm0.10$ & $11.87\pm1.82$ & $1988.5 \pm1.0$ \\
 C3 &  8 & $0.62 \pm0.04$ & $11.59\pm0.76$ & $1989.7 \pm0.3$ \\
 C4 &  7 & $0.44 \pm0.01$ &  $8.27\pm0.24$ & $1989.8 \pm0.1$ \\
 C5 &  7 & $0.43 \pm0.02$ &  $8.16\pm0.29$ & $1990.8 \pm0.2$ \\
 C6 &  9 & $0.41 \pm0.02$ &  $7.80\pm0.33$ & $1992.3 \pm0.1$ \\
 C7 & 17 & $0.37 \pm0.01$ &  $6.89\pm0.19$ & $1993.2 \pm0.1$ \\
 C8 & 11 & $0.32 \pm0.01$ &  $6.04\pm0.20$ & $1994.4 \pm0.1$ \\
 C9 & 10 & $0.26 \pm0.01$ &  $4.98\pm0.27$ & $1995.1 \pm0.1$ \\
C10 &  3 & $0.24 \pm0.01$ &  $4.52\pm0.45$ & $1996.5 \pm0.2$ \\
C11 &  2 & $0.29 \pm0.02$ &  $5.48\pm0.55$ & $1998.2 \pm0.3$ \\
\hline
\end{tabular}
\end{table}