\begin{table}%T1
%\centering
\par
\caption{Cloud masses.}\label{t1}
\begin{tabular}{ccccc}
\hline\hline
%\noalign{\smallskip}
%region &S$_{1.2mm}$ & M$_{dust}^{tot} $ & M$_{vir}$ &  Ref. of $^{12}$CO \\
Region &$S_{1.2~{\rm mm}}$ & $M_{{\rm gas}}$  & $M_{{\rm vir}}$ & $M({\rm H_2})$    \\
     &mJy        & $M_\odot$         & $M_\odot$  &   $M_\odot$    \\
%\noalign{\smallskip}
\hline
%\noalign{\smallskip}
%SMCB1-1  & $50.0 \pm 0.7$ & $2.7\times 10^5 $  &  $ 1.2  \times 10^4 $  &  1  \\
SMCB1-1  & $50.0 \pm 5$ & $2.7\times 10^5 $  &  $ 1.2  \times 10^4 $ & $ 2.7 
\times 10^4 $\\
%N159-S   & $374 \pm 0.3$ & $1.1\times 10^4 $  &   $2.4  \times 10^5  $ &  2  \\
%\noalign{\smallskip}
\hline
\end{tabular}
\end{table}