\begin{table}%t12
%\centering
\par
\caption{\label{tablecomp}Comparison samples and the median value of their molecular gas masses.}
\begin{tabular}{ccc}
\hline \hline \noalign{\smallskip}
\textbf{Criteria of selection}&\textbf{Sample name} & \textbf{Molecular gas mass} \\
&  & ($\times10^8$ M$_{{\rm H}_2}$) \\
\hline
\textbf{Elliptical galaxies}&This sample & 3.7  \\
&\cite{Wiklind95a} & 6.8  \\
\hline
\textbf{FIR galaxies }&\cite{Evans05} & 37  \\  
\textbf{and QSO's}&\cite{Mazzarella93} & 11  \\
&\cite{Bertram07} & 30  \\
\hline
\textbf{ULIRGS}&\cite{Solomon97} & 100  \\ 
\hline
\end{tabular}
\end{table}