\begin{table}%t3
\caption{\label{t:factorp}Conversion factors \textit{p} as derived from the line profiles shown
in~Fig.~\ref{f:dopplershift}.}
%\centering
\par
\begin{tabular}{ccc}
\hline\hline \noalign{\smallskip}
$u_{\rm gas}$& RV &$p$\\
$[$km~s$^{-1}$$]$&$[$km~s$^{-1}$$]$&\\
\hline
5&3.90&1.28\\
10&8.10&1.24\\
20&16.70&1.20\\
30&23.85&1.26\\
40&32.05&1.25\\
\hline
\end{tabular}
\end{table}