Fig. 6
Relative abundances of species detected towards AFGL 4176 and IRAS 16293B. Labels in bold refer to species with five or more detected transitions towards AFGL 4176. Oxygen-bearing species are labelled by numbers 1–9 in red, N-bearing species are labelled by numbers 20–25 in blue, and S-bearing species are labelled by numbers 30–34 in yellow. Black arrows indicate upper limits on the relative abundance of CH2 (OH)CHO in AFGL 4176 and of SO in IRAS 16293B. The dashed grey line indicates the 1:1 ratio of relative abundances in AFGL 4176and IRAS 16293B.
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