\begin{table}%t1
\caption{Observational parameters for the $^{13}$CO observations.}
\label{tbl:CO_radio_parameters}
%\centering
\small
\begin{tabular}{lccc}
\hline
\hline
Parameter& Mopra & Onsala & JCMT\\
\hline
\# of sources observed & 818 & 9 & 27\\
Rest frequency (GHz) & 110.201& 110.201& 220.3986 \\
Total bandwidth (MHz)& 64 & 80 & 267 \\
Vel. bandpass (\kms) & 174 & 224 & 360 \\ 
Number of channels   & 1024 & 1600 & 1713 \\
Vel. resolution (km s$^{-1}$) & 0.17 & 0.14 & 0.21\\
Beam size (\arcsec) & 33 & 35 & 21 \\
Date of observations & 2002--2005 & March 2003&2003--2004\\
Integration time (mins) & 10 & 10 & 6 \\
Telescope efficiency ($\eta_{\rm{fss}}$) & 0.55 & 0.43 & 0.69\\
\hline
\end{tabular}
\end{table}