Fig. 4
Comparison of the results from MC, HME to the 2nd order, HME to the 3rd order, and RE. The y-axis is the number of each species in a volume containing exactly one grain. To translate it into abundance relative to H nuclei, it should be multiplied by 3.5 × 10-10. Physical parameters used when running these models include T = 10 K, nH = 2 × 105 cm-3, grain radius = 0.02 μm.
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