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Fig. 2

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Mixing ratio of HNC in the upper atmosphere of Titan. Nominal model (solid line) and the different acceptable profiles derived from recent Herschel observations (Moreno et al. 2011) (grey dotted lines). Local sensitivity analysis for the isomerization reaction H + HNC  →  HCN + H is also illustrated by changing its rate by a factor of 10 or 100.

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