\begin{table}%t3
\caption{\label{table:RC}Rotation curves for Malin~1 and NGC~7589.}
\par
%\centerline
{\small\begin{tabular}{c c c c | c c c c}
\hline
\hline
\multicolumn{4}{c|}{MALIN 1} & \multicolumn{4}{c}{NGC 7589} \\
\multicolumn{2}{c}{Radius} & $V_{\rm{c}}$  & $\sigma_{V_{\rm{c}}}$ & \multicolumn{2}{c}{Radius} & $V_{\rm{c}}$  & $\sigma_{V_{\rm{c}}}$\\
($''$) & (kpc)             & (km~s$^{-1}$)        & (km~s$^{-1}$) & ($''$) & (kpc)             & (km~s$^{-1}$)        & (km~s$^{-1}$)\\
\hline
8.0 & 12.5  & 236.9 & 9.4 & 10.0 & 5.9  & 200.9 & 9.3 \\
24.0 & 37.5  & 216.2 & 2.6 & 30.0 & 17.7 & 194.6 & 3.7 \\
40.0 & 62.5  & 197.4 & 4.7 & 50.0 & 29.5 & 204.8 & 3.2 \\
56.0 & 87.5  & 214.1 & 11.8 & 70.0 & 41.3 & 200.1 & 3.3 \\
\hline
\end{tabular}}
\tablefoot{Columns (1) and (2): ring radius in arcsec and~kpc. Column (3): circular velocity. Column (4): error on the circular velocity as defined in the text.}\vspace*{-4mm}
\end{table}