\begin{table}%t7
\caption{\label{galresult}Beam-averaged model parameters.}
%\centerline
{
\begin{tabular}{lccccccccc}
\hline\hline
Galaxy & &\multicolumn{3}{c}{Beam-averaged column densities} & Outer  & Central    & Face-on       & Relative \\
       & &         &        &                                & radius & ${\rm H_{2}}$ mass & mass density  & mass \\
       & & $N$(CO) & $N$(C) & $N({\rm H_{2}})$                       & $R$    & $M_{{\rm H_{2}}}$   & $\sigma({\rm H_{2}})$ & component 1:2 \\
   &   &\multicolumn{2}{c}{($10^{18} ~{\rm cm^{-2}}$)}&($10^{21} ~{\rm cm^{-2}}$) & (kpc)  & ($10^{8}~\Msun$) &($\Msun$/pc$^{-2}$)& \\
\hline
NGC~278  & 1/2 & 0.24& 0.09& 0.6 & --- & --- &  8 & 0.90:0.10 \\
NGC~660  & 3   & 0.33& 0.38& 1.3 & 0.9 & 0.6 &  7 & 0.67:0.33 \\
         & 4   & 0.49& 0.96& 2.7 & 0.9 & 1.2 & 15 & 0.75:0.25 \\
NGC~3628 & 5   & 2.7 & 0.13& 5.2 & 0.6 & 1.5 & ---& 0.25:0.75 \\
         & 6   & 2.1 & 0.65& 5.1 & 0.6 & 1.5 & ---& 0.90:0.10 \\
NGC~4631 & 7   & 0.22& 0.51& 1.4 & --- & --- & ---& 0.20:0.80 \\
NGC~4666 & 8   & 0.30& 0.31& 1.1 & 1.5 & 1.2 &  6 & 0.50:0.50 \\
\hline
\end{tabular}}
\end{table}