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Fig. 4.


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Calculated abundances for c-C5H6 and its precursors (left panel) and for the products of its reaction with CCH (right panel). Solid lines correspond to the standard chemical model, while dashed lines correspond to a model including formation of c-C5H6 involving the reaction l-C3H + C2H4 (see text). The horizontal band and dotted lines correspond to the abundances observed in TMC-1 (see Table A.1).

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