\begin{table}%T1 \caption{\label{table1}\label{Intensities}Observational parameters of the SiO and CN PdBI data.} \small%\centering \par \begin{tabular}{lcc} \hline \hline \noalign{\smallskip} & SiO & CN \\ \hline Line & $v=0$, $J=2$--1 & $N=2$--1 ($J=5$/2--3/2 (HF), $J=3$/2--1/2 (LF)) \\ Frequency & 86.8~GHz & 226.9~GHz (HF), 226.7~GHz (LF) \\ Beam & $3.5''\times 2.1''$, $\rm PA=29^{\circ}$ & $1.5''\times 0.8''$, $\rm PA =19^{\circ}$ \\ 1-$\sigma$ (rms) & 1.5~mJy~beam$^{-1}$ ($\Delta \nu=2.5$~MHz) & 7.6~mJy~beam$^{-1}$ ($\Delta \nu=6.25$~MHz) \\ Field of view & 56$^{\prime\prime}$ & 21$^{\prime\prime}$ \\ $T_{\rm mb}$/$S$ & 22~K~Jy$^{-1}$~beam & 21~K~Jy$^{-1}$~beam \\ \hline \end{tabular} \vspace*{4mm} \end{table}