Astronomy & Astrophysics

Table 1: Technical details of the JCMT heterodyne receivers. The columns list the used receivers, the frequency windows at which they operate, the observable CO rotational transition, the beam efficiency $\eta _{{\rm mb}}$ and the half power beam width ( HPBW).
receiver Frequency CO transition $\eta _{{\rm mb}}$ HPBW

(GHz)

A3 215-275 CO(2-1) 0.69 19.7''

B3 315-373 CO(3-2) 0.63 13.2''

W/C 430-510 CO(4-3) 0.52 10.8''

W/D 630-710 CO(6-5) 0.30 8.0''

E 790-840 CO(7-6) 0.24 6.0''

**Table 1:** Technical details of the JCMT heterodyne receivers. The columns list the used receivers, the frequency windows at which they operate, the observable CO rotational transition, the beam efficiency $\eta _{{\rm mb}}$ and the half power beam width ( *HPBW*).
receiver	Frequency	CO transition	$\eta _{{\rm mb}}$	HPBW
	(GHz)
A3	215-275	CO(2-1)	0.69	19.7''
B3	315-373	CO(3-2)	0.63	13.2''
W/C	430-510	CO(4-3)	0.52	10.8''
W/D	630-710	CO(6-5)	0.30	8.0''
E	790-840	CO(7-6)	0.24	6.0''

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