Fig. 5.
Calculated fractional abundances of various hydrocarbons as a function of time. The asterisk in the legend means that the chemical model does not distinguish between different isomers. The abundances observed in TMC-1 for c-C3H2 (Cernicharo et al. 2021a) and l-H2Cn with n = 3−6 (this work) are indicated by dashed horizontal lines.
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