Table 2: Line parameters of CO isotopomers at the peak position (IRAM-30 m observations). All line parameters have been obtained from a two-Gaussian fit, except for the C¹⁷O (1-0) line, for which we have used METHOD HFS of the CLASS program to take into account the hyperfine structure (see text).
Line rms $V_{\rm lsr}$ $\Delta v_{1/2}$ $\int T_{\rm MB}{\rm d}v$

(K) (km s^-1 ) (km s^-1 ) (K km s^-1 )

C¹⁸O (1-0) 0.065 -50.0 2.38 3.73

-47.8 1.20 2.59

C¹⁷O (1-0) 0.064 -49.9 2.08 1.18

-47.5 1.12 0.41

C¹⁷O (2-1) 0.18 -49.8 2.93 5.06

-47.3 0.90 0.69

**Table 2:** Line parameters of CO isotopomers at the peak position (IRAM-30 m observations). All line parameters have been obtained from a two-Gaussian fit, except for the C¹⁷O (1-0) line, for which we have used METHOD HFS of the CLASS program to take into account the hyperfine structure (see text).
Line	rms	$V_{\rm lsr}$	$\Delta v_{1/2}$	$\int T_{\rm MB}{\rm d}v$
	(K)	(km s^-1 )	(km s^-1 )	(K km s^-1 )
C¹⁸O (1-0)	0.065	-50.0	2.38	3.73
		-47.8	1.20	2.59
C¹⁷O (1-0)	0.064	-49.9	2.08	1.18
		-47.5	1.12	0.41
C¹⁷O (2-1)	0.18	-49.8	2.93	5.06
		-47.3	0.90	0.69

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