\begin{table}%t3
\caption{\label{regression}Linear regression fits to the motion of listed components.}
%\centering
\par
\begin{tabular}{lrrrrrc}
\hline\hline \noalign{\smallskip}
Comp. ID & $r_{\rm mean}$ [mas] & $\mu_{\rm r}^{\rm 15}$ [mas~$\rm yr^{-1}$] &$\beta_{\rm app}^{\rm 15}$ [$c$]& $
\mu^{\rm all}_{\rm r}$ [mas~$\rm yr^{-1}$] & $\beta^{\rm all}_{\rm app}$ [$c$]&$\rm t_{0}$ [yr]  \\[2pt]
\hline 
{C0} & $0.30 \pm 0.02$ & $0.017 \pm 0.001$ & $0.39 \pm 0.02$ & $0.006 \pm 0.001$ & $0.14 \pm 0.02$& /\\
{C1} & $0.79 \pm 0.03$ & $-0.037 \pm 0.003$ & $-0.86 \pm 0.07$ & $0.001 \pm 0.001$& $0.02 \pm 0.02$ &/ \\
{Ca} & $1.27 \pm 0.03$ & $0.007 \pm 0.004$ & $0.16 \pm 0.09$ & $0.022 \pm 0.001$ & $0.51 \pm 0.02$ &/ \\
{C2} & $1.93 \pm 0.03$ & $0.017 \pm 0.007$ & $0.39 \pm 0.16$ & $-0.002 \pm 0.001$ & $-0.05 \pm 0.02$ &/ \\
{C4} & $3.70 \pm 0.08$ & $0.145 \pm 0.017$ & $3.37 \pm 0.39$ & $0.001 \pm 0.001$ & $0.02 \pm 0.02$ &/ \\
{C8} & $6.78 \pm 0.18$ & $-0.182 \pm 0.005$ & $-4.23 \pm 0.12$ & $-0.182 \pm 0.005$ & $-4.23 \pm 0.12$ &/ \\
{C12} & $10.02 \pm 0.38$ & $-0.715 \pm 0.113$ & $-16.62 \pm 2.63$ & $-0.197 \pm 0.069$ & $-4.58 \pm 1.60$ &/ \\
{B3} &               /    & $0.807 \pm 0.151$ & $18.76 \pm 3.51$ &/ &/ & $1999.8 \pm 1.1$ \\
\hline
\end{tabular}
\tablefoot {$r_{\rm mean}$~is the mean core separation over the time-range of the regression, $\mu$~is the proper motion of the component, and~$\beta_{\rm app}$ is the apparent speed. $\mu$~and~$\beta_{\rm app}$ are computed twice: once using only 15~GHz results, and once with the combined results from all frequencies.  $t_0$~is the extrapolated time of component ejection from the core in the case of component~{B3}.}
\end{table}