**Table 1:** Observational parameters for the ¹³CO observations.
Parameter	Mopra	Onsala	JCMT
# of sources observed	818	9	27
Rest frequency (GHz)	110.201	110.201	220.3986
Total bandwidth (MHz)	64	80	267
Vel. bandpass (km s^-1)	174	224	360
Number of channels	1024	1600	1713
Vel. resolution (km s^-1)	0.17	0.14	0.21
Beam size ( $^{\prime \prime }$ )	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

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