Fig. 3.
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Fractional abundances of three C5H4 isomers calculated with the chemical model as a function of time. Dotted lines lines correspond to calculated abundances when the dissociative recombination of C5H
is neglected as a source of C5H4 isomers. The abundances observed in TMC-1 (from this work and Cernicharo et al. 2022) are indicated by horizontal dashed lines.
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