Fig. 20
Reference isobaric photochemical model for the Orion Bar with P = 108
K cm-3 and
χ = 2 ×
104. 13C fractionation reactions have been included to
explain the observed [C13CH]/[13CCH] ratio (shown in the region enclosed by the
red dashed lines). The black curve show a model in which the rate of the
reaction is 100 times higher than
that of the 
reaction (see text).
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