\begin{table}%t8
%\centering
\par
\caption{\label{param-13co63TOTspec}Summary of the parameters of the total integrated $^{13}$CO(1--0) emission of the GMC surrounding~G19.61--0.23 and of a typical cloud in Henize~2--10, from SMA observations.}  
\smallskip 
\begin{tabular}{c c c c c}
\hline\hline \noalign{\smallskip}
$FWHM$ & $M_{\rm VIR}$ & $M_{\rm LTE}$ & $\Sigma_{\rm VIR}$ & $\Sigma_{\rm LTE}$ \\
(km~s$^{-1}$) & ($\times$$10^5~M_{\odot}$) & ($\times$$10^5~M_{\odot}$) & (g/cm$^{2}$) & (g/cm$^{2}$) \\ 
(1)&(2)&(3)&(4)&(5)\\
\hline                    
\multicolumn{5}{c}{{G19.61--0.23}}  \\    
8 & 5 & 4 & 0.02 & 0.02               \\  
\hline
\multicolumn{5}{c}{{Henize~2--10}}  \\    
 20 & 39 & 30 & 0.13 & 0.10 \\
\hline
\end{tabular}
\tablefoot{Column~(1): $FWHM$ line-width of the emission; Col.(2): virial mass; Col.~(3): LTE mass, assuming $T_{\rm ex} = 20$~K; Col.~(4): surface density from the virial mass; Col.~(5): surface density from the LTE mass.}
\end{table}