\begin{table}%t11
%\centering
\par
\caption{\label{Lumfirco}FIR-to-CO luminosities and their ratios.}
\par
\begin{tabular}{c c c c } 
\hline\hline \noalign{\smallskip}
\textbf{Sample name} & $L_{\rm FIR}$ &$L'_{\rm CO}$ & $L_{\rm FIR}/L'_{\rm CO}$ ratio. \\
& ($L_{\odot}$) & (K~km~s$^{-1}$~pc$^2$) &  ($L_{\odot}$(K~km~s$^{-1}$~pc$^2)^{-1}$)\\
\hline
This sample & $8.9\times10^9$ & $4.2\times10^7$ & 52.0 \\
\cite{Wiklind95a} & $6.5\times10^{9}$ & $1.6\times10^{8}$ & 39.4 \\
%\hline 
\cite{Mazzarella93}& $1.94\times10^{11}$ & $1.1\times10^{9}$ & 82.2 \\
\cite{Evans05} & $3.6\times10^{10}$ & $1.2\times10^{9}$ & 35.4 \\
\cite{Bertram07}& $4.2\times10^{10}$ & $9.2\times10^{8}$ & 49.1 \\
%\hline 
\cite{Solomon97} & $1.2\times10^{12}$ & $7.9\times10^{9}$ & 146.8 \\
\hline
\end{tabular} 
\end{table}