\begin{table}%t4
%\centering
\par
\caption{\label{tabcomp}High-mass young stellar objects in NGC~6334-NGC~6357 ($M > 200$~\msun) compared to Cygnus~X cores and HMPOs clumps.}
\begin{tabular}{ccccc}
\hline \hline\noalign{\medskip}
&  Cygnus~X   & {NGC~6334 - NGC~6357} & HMPOs  \\
\hline 
SiO               &  93\% &  80\%   &  ?\\
Size (pc)         &  0.13       &  0.37             &  0.5 \\
Mass (\msun)      &  91        &  617            &  290 \\
$\langle n_{H_{2}}\rangle $ (cm$^{-3}$) & $1.7 \times 10^{5}$ & $1.5 \times 10 ^{5}$ & $8.5 \times 10^{3}$  \\
\hline
\end{tabular}
\end{table}