\begin{table}%t3
%\centering
\par
\caption{\label{velocity2}Projected mean expansion velocities of
the center of the CN gas cloud. $\Delta t$~gives the time since impact and
$p$ the projected distance from the nucleus. PA lists the position angle at which the measurement was done, with respect to the projected solar direction.}
\begin{tabular}{cccrr} \hline\hline
\noalign{\smallskip}
 PA         & date, time    & $\Delta t$ [s] & $p$ [10$^4$ km]        & $v$ [km s$^{-1}$] \\ \hline
0$^\circ$     & July 4, 23:50 & 65~182          & $3.75\pm0.30$ & $0.58\pm0.05$ \\
180$^\circ$   & July 4, 23:50 & 65~182          & $4.13\pm0.30$ & $0.63\pm0.05$ \\
90$^\circ$    & July 5, 00:48 & 68~628          & $3.95\pm0.37$ & $0.58\pm0.05$ \\
270$^\circ$   & July 5, 00:48 & 68~628          & $4.91\pm0.31$ & $0.72\pm0.05$ \\
0$^\circ$     & July 5, 01:58 & 72~861          & $4.35\pm0.32$ & $0.60\pm0.04$ \\
180$^\circ$   & July 5, 01:58 & 72~861          & $4.62\pm0.30$ & $0.63\pm0.04$ \\
0$^\circ$     & July 5, 03:46 & 79~334          & $4.78\pm0.32$ & $0.60\pm0.04$ \\
180$^\circ$   & July 5, 03:46 & 79~334          & $5.04\pm0.30$ & $0.64\pm0.04$ \\
0$^\circ$     & July 6, 00:32 & 154~083         & $9.91\pm1.00$ & $0.64\pm0.07$ \\
180$^\circ$   & July 6, 00:32 & 154~083         & $10.55\pm1.04$ & $0.69\pm0.07$ \\
  \hline
\end{tabular}
\end{table}