\begin{table}%t6
\caption{\label{n4441chap_coprop}Integrated intensity line ratios derived from the CO measurements at the central position.} 
\small%\centerline
 {
\begin{tabular}{lc}
\hline\hline \noalign{\smallskip}
 Property& Result\\
\hline\noalign{\smallskip}
 $M_{\rm H2}$ ($10^8$ \msun) & 4.6\\
$^{12}$CO(2--1)/$^{12}$CO(1--0)& 0.5 (0.06)\\
$^{13}$CO(2--1)/$^{13}$CO(1--0) & 0.42 (0.17)\\
$^{12}$CO(1--0)/$^{13}$CO(1--0) & 21 (3.5)\\
$^{12}$CO(2--1)/$^{13}$CO(2--1) & 25 (7.6)\\
\hline
\end{tabular}}
\medskip
In brackets, the errors in the line ratio are given, following standard error propagation calculations. A~source size of~22\arcsec\ is used to evaluate the line ratios.
\end{table}