\begin{table}%t1 \caption{\label{pos}Positions of the $^{12}$CO~$J=13$--12 observations.} %\centerline {\small \begin{tabular}{lcc} \hline\hline Position & $\Delta\alpha$ [$''$] & $\Delta\delta$ [$''$] \\ \hline FIR~5 & 0.0 & 0.0 \\ IRS~3 & 3.3 & 16.0 \\ \#1 & 8.8 & 28.6 \\ \#2 & 13.8 & 41.9 \\ IRS~2 & 24.6 & 68.5 \\ \hline \end{tabular}} \medskip The (0, 0) position is $\rm\alpha = 5^h41^m44.18^s$, $\rm\delta = -1^\circ55'38.0''$ ($J=2000$, Mezger et~al. \cite{1.3mm}). \end{table}