Fig. 3.
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Calculated fractional abundances of C5H4, C7H4, C4H3N, and C6H3N (allowing for various isomers) as a function of time. The horizontal dotted lines correspond to the abundances observed in TMC-1, where C5H4 includes CH3C4H and CH2CCHCCH, C7H4 includes CH3C6H and CH2CCHC4H, C4H3N includes CH3C3N, CH2CCHCN, and HCCCH2CN, and C6H3N includes CH3C5N and CH2CCHC3N.
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