\begin{table}%t5
\caption{\label{tab:evpa15}The results of the 15~GHz VLBA observations.}
%\centerline
 {\small \begin{tabular}{cccccccc}
\hline \hline
 Epoch & \multicolumn{3}{c}{Core} & \multicolumn{3}{c}{Jet} & \\
& $I_{\rm c}$ [mJy] & $P_{\rm c}$ [mJy] & $\chi_{\rm c} [^\circ]$ & $I_{\rm j}$ [mJy] & $P_{\rm j}$ [mJy] & $\chi_{\rm j} [^\circ]$ & $\vert \chi_{\rm c}-\chi_{\rm j} \vert [^\circ]$ \\
\noalign {\smallskip}\hline
2007.540 & $257 \pm 2$ & $1.3 \pm 0.3$ & $75 \pm 10$ & $39 \pm 4$ & $0.5 \pm 0.3 $ & $96 \pm 10$ & $24$ \\
2007.661 & $250 \pm 20$ & $2.7 \pm 0.1$ & $-11 \pm 6$ & $35 \pm 4$ & -- & -- & -- \\ 
2007.773 & $238 \pm 20$ & $3.0 \pm 0.1$ & $-48 \pm 5$ & $26 \pm 4$ & -- & -- & -- \\ 
2007.907 & $261 \pm 11$ & $2.3 \pm 0.1$ & $-42 \pm 10$ & $33 \pm 3$ & $0.6 \pm 0.3$ & $64 \pm 10$ & $106$ \\ 
2008.025 & $267 \pm 10$ & $3.5 \pm 0.1$ & $-4 \pm 10$ & $36 \pm 2$ & $0.5 \pm 0.1$ & $113 \pm 10$ & $114$ \\
2008.137 & $251 \pm 3$ & $2.9 \pm 0.1$ & $2 \pm 5$ & $31 \pm 2$ & -- & -- & -- \\  
\hline
\end{tabular}}
\medskip
The columns are the same as in Table~\ref{tab:evpa5}.
\end{table}