**Table 2:** Beamsizes & efficiencies.
Transition	$\nu$	HPBW^a	$\eta_{\rm mb}$ ^a	Telescope^a
	[GHz]	['']
HCN 1-0	88.632	44 28	0.65 0.77	OSO IRAM
HNC 1-0	90.663	55 27	0.74 0.77	SEST IRAM
CN 1-0	113.491	45 22	0.71 0.74	SEST IRAM
CO 1-0	115.271	44 21	0.70 0.74	SEST IRAM
CN 2-1	226.875	23 11	0.51 0.53	SEST IRAM
CO 2-1	230.538	20 11	0.66 0.52	JCMT IRAM
HCN 3-2	265.886	18 9	0.60 0.45	JCMT IRAM
HNC 3-2	271.981	18 9	0.60 0.44	JCMT IRAM

^a: The columns are divided in two sub-columns (left: OSO, SEST, JCMT, and right IRAM) indicating the telescope used to obtain the corresponding parameter. The IRAM 30 m telescope was used to observe NGC 3079. The other sources were observed with the OSO 20 m, SEST and JCMT telescopes.

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