Fig. 10
Various fractions (see text) on the grain surface calculated with the present chemical model (solid lines) and the Taquet et al. (2014) chemical model (dashed lines) as functions of the amount of MLs on the surface. The adopted physical parameters are nH = 105 cm-3, Tdust = Tgas = 10 K, AV = 10 mag. The time required to form each amount of the MLs is indicated on the top axis.
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