Fig. 3.
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Chemical models for the CnH+ species. Upper: computed abundance ratio between the clusters C3, C5 and C7 and their protonated forms CnH+ as a function of time. Lower: abundances relative to H2 for the carbon clusters and their protonated derivatives. The dotted horizontal lines correspond to the abundances observed in TMC-1 for C3H+ and C5H+.
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