Table 3.

Best fit LVG model parameters and comparison with the column density obtained with the rotational diagram (RD) analysis.

	LVG calculations			RD analysis*
	Tk [K]	n(H2) [cm−3]	N(X)LVG [cm−2]	N(X)RD [cm−2]
o-H2CO	~200	~106	4.0 × 1013	(4.4 ± 0.6) × 1013
p-H2CO	~200	~106	1.8 × 1013	(1.6 ± 0.1) × 1013
HC3N	~80	~106	4.0 × 1011	(4.2 ± 0.3) × 1011
A-CH3CN	~150	~106	5.0 × 1011	(5.8 ± 0.8) × 1011
E-CH3CN	~150	~106	6.0 × 1011	(5.7 ± 0.7) × 1011
E-CH3OH	~40	~3×107	1.9 × 1013	(1.9 ± 0.2) × 1013

Notes.

^*Rotational diagram analysis assuming uniform beam filling (see Sect. 5.4).