\begin{table}%t2
%\centering
\par
\caption{\label{velocity}Projected mean expansion velocities of
the outermost part of the dust and gas cloud. $\Delta t$ gives the time since impact and
$p$ the projected distance from the nucleus of the outermost
detectable part of the impact cloud. 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
\multicolumn{5}{c}{CN}                                                          \\ \hline
0$^\circ$    & July 4, 23:50 & 65~182   & $\rm 7.50^{+0.25}_{-0.25}$ & $\rm 1.15^{+0.04}_{-0.04}$ \\
180$^\circ$  & July 4, 23:50 & 65~182   & $\rm 7.75^{+0.23}_{-0.38}$ & $\rm 1.19^{+0.04}_{-0.06}$ \\
90           & July 5, 00:48 & 68~628   & $\rm 7.78^{+0.33}_{-0.15}$ & $\rm 1.15^{+0.05}_{-0.02}$ \\
270          & July 5, 00:48 & 68~628   & $-$ & $-$ \\
0$^\circ$   & July 5, 01:58 & 72~861   & $\rm 8.45^{+0.25}_{-0.57}$ & $\rm 1.16^{+0.03}_{-0.08}$ \\
180$^\circ$ & July 5, 01:58 & 72~861   & $\rm 8.86^{+0.51}_{-0.38}$ & $\rm 1.22^{+0.07}_{-0.05}$ \\
0$^\circ$   & July 5, 03:46 & 79~334   & $\rm 8.83^{+0.62}_{-0.21}$ & $\rm 1.11^{+0.08}_{-0.03}$ \\
180$^\circ$ & July 5, 03:46 & 79~334   & $\rm 9.89^{+0.18}_{-0.39}$ & $\rm 1.25^{+0.02}_{-0.05}$ \\ \hline
\multicolumn{5}{c}{Dust}                  	       	  \\ \hline
270$^\circ$ & July 5, 00:48 & 68~628   & $\rm 2.53^{+0.12}_{-0.36}$ & $\rm 0.37^{+0.02}_{-0.05}$ \\
0$^\circ$   & July 5, 01:58 & 72~861   & $\rm 1.51^{+0.13}_{-0.15}$ & $\rm 0.21^{+0.02}_{-0.02}$ \\
0$^\circ$   & July 5, 03:46 & 79~334   & $\rm 1.56^{+0.16}_{-0.13}$ & $\rm 0.20^{+0.02}_{-0.02}$ \\
270$^\circ$ & July 6, 01:36 & 157~935  & $\rm 3.04^{+0.23}_{-0.38}$ & $\rm 0.19^{+0.02}_{-0.02}$ \\
0$^\circ$   & July 7, 00:32 & 240~477  & $\rm 2.53^{+0.13}_{-0.15}$ & $\rm 0.10^{+0.01}_{-0.01}$ \\
270$^\circ$ & July 7, 00:53 & 241~760  & $\rm 4.99^{+0.35}_{-1.90}$ & $\rm 0.21^{+0.01}_{-0.08}$ \\
0$^\circ$   & July 7, 02:20 & 246~965  & $\rm 2.51^{+0.18}_{-0.23}$ & $\rm 0.10^{+0.01}_{-0.01}$ \\
270$^\circ$ & July 7, 03:01 & 249~430  & $\rm 4.00^{+1.10}_{-0.45}$ & $\rm 0.16^{+0.04}_{-0.02}$ \\ \hline
\end{tabular}
\end{table}