Table 1: CO rotational line profiles as used in this study. Consecutive columns list the transition, the telescope, the half-power beamwidth ( HPBW), the main-beam efficiency ( $\eta _{\rm {MB}}$ ), the absolute flux uncertainty ( $\sigma _{\rm {abs}}$ ), and the literature reference. The beam width, main-beam efficiency, and absolute flux uncertainty listed in this table are the ones as found in the cited paper. In case the absolute flux uncertainty was not given, an uncertainty of 20% is assumed.
Transition Telescope HPBW $\eta _{\rm {MB}}$ $\sigma _{\rm {abs}}$ Literature

reference

CO(1-0) IRAM 23 $^{\prime \prime }$ 0.79 20%^a D. Teyssier (priv. comm.)

CO(2-1) JCMT 19.7 $^{\prime \prime }$ 0.69 20% this paper

CO(2-1) IRAM 13 $^{\prime \prime }$ 0.60 20%^a D. Teyssier (priv. comm.)

CO(2-1) SEST 23 $^{\prime \prime }$ 0.50 20%^a Winters et al. (2003)

CO(2-1) NRAO 25 $^{\prime \prime }$ 0.33^b 30% Wannier & Sahai (1986)

CO(2-1) CSO 30 $^{\prime \prime }$ 0.76 20%^a Knapp et al. (1998)

CO(3-2) JCMT 13.2 $^{\prime \prime }$ 0.63 20% this paper

CO(3-2) CSO 20 $^{\prime \prime }$ 0.65 20%^a Knapp et al. (1998)

CO(3-2) CSO 21 $^{\prime \prime }$ 0.65 20% Teyssier et al. (2006)

CO(6-5) CSO 12 $^{\prime \prime }$ 0.55 30% Teyssier et al. (2006)

**Table 1:** CO rotational line profiles as used in this study. Consecutive columns list the transition, the telescope, the half-power beamwidth ( *HPBW*), the main-beam efficiency ( $\eta _{\rm {MB}}$ ), the absolute flux uncertainty ( $\sigma _{\rm {abs}}$ ), and the literature reference. The beam width, main-beam efficiency, and absolute flux uncertainty listed in this table are the ones as found in the cited paper. In case the absolute flux uncertainty was not given, an uncertainty of 20% is assumed.
Transition	Telescope	HPBW	$\eta _{\rm {MB}}$	$\sigma _{\rm {abs}}$	Literature
					reference
CO(1-0)	IRAM	23 $^{\prime \prime }$	0.79	20%^a	D. Teyssier (priv. comm.)
CO(2-1)	JCMT	19.7 $^{\prime \prime }$	0.69	20%	this paper
CO(2-1)	IRAM	13 $^{\prime \prime }$	0.60	20%^a	D. Teyssier (priv. comm.)
CO(2-1)	SEST	23 $^{\prime \prime }$	0.50	20%^a	Winters et al. (2003)
CO(2-1)	NRAO	25 $^{\prime \prime }$	0.33^b	30%	Wannier & Sahai (1986)
CO(2-1)	CSO	30 $^{\prime \prime }$	0.76	20%^a	Knapp et al. (1998)
CO(3-2)	JCMT	13.2 $^{\prime \prime }$	0.63	20%	this paper
CO(3-2)	CSO	20 $^{\prime \prime }$	0.65	20%^a	Knapp et al. (1998)
CO(3-2)	CSO	21 $^{\prime \prime }$	0.65	20%	Teyssier et al. (2006)
CO(6-5)	CSO	12 $^{\prime \prime }$	0.55	30%	Teyssier et al. (2006)

^a Assumed, ^b taken from Huggins & Healy (1986).

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