\begin{table}%t1
\caption {Observed transitions.}
\label{tab_mol}
%\centerline
{\begin{tabular}{ccccc}
\hline \hline
 molecular  & frequency & {\it {\it HPBW}} & $\Delta v^{\dagger}$ & Bandwidth$^{\dagger}$ \\
 transition  & (GHz) & (\asec ) & (\kms ) & (\kms ) \\
\hline
\H\ (1$-$0)  & 93.173772 & 26 & $0.031/3.218$ & $113/824$ \\
\H\ (3$-$2)  & 279.511863 & 9 & $0.042/1.073$ & $75/275$ \\
\D\ (2$-$1)  & 154.217137 & 16 & $0.038/1.944$ & $68/498$ \\
\D\ (3--2)  & 231.321966 & 10 & $0.051/1.296$ & $91/332$ \\
\CIII\ (2$-$1) & 224.714385  & 11 & $0.052/1.334$ &  $93/342$\\
DCO$^{+}$ (2$-$1) & 144.077319 & 16 & $0.041/2.081$ & $73/533$ \\
\hline
\end{tabular}} 
\par
$^{\dagger}$ The two values refer to the two spectrometers used. 
\end{table}