CHemical Evolution in MassIve star-forming COres (CHEMICO) - I. Evolution of the temperature structure

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Table 7

Molecular fractional abundances relative to H₂.

Source	Molecular abundances
	Hydrocarbons					Cyanides
	C₂H	c-C₃H	c-C₃H₂	C₄H	CH₃CCH	HC₃N	CH₃CN	HC₅N
	×10⁻⁹	×10⁻¹¹	×10⁻¹⁰	×10⁻¹⁰	×10⁻⁹	×10⁻¹⁰	×10⁻¹⁰	×10⁻¹¹
G034 (HMSC) ^a	1.6(0.5)	≤2	1.9(0.5)	3.8(0.9)^b	0.21(0.09)	1.3(0.4)	≤0.1	≤1
AFGL (HMPO) ^a	5(2)	1.4(0.8)	0.6(0.2)	≤0.06	4.7(1.6)	3.3(0.9)	2.7(0.9)	1.8(0.6)
G589 (UCHII) ^a	3.4(1.4)	≤0.7	0.5(0.2)	≤0.05	9(3)	6.5(1.9)	2.7(1.0)	3.0(0.9)

Notes. The errors are given in brackets and include a 10% calibration error on the molecular column densities. ^(a) Computed summing the column densities of the two velocity features, when present. ^(b) Computed assuming T_ex from c-C₃H₂.

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