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Table 12

Initial ice abundances with respect to water used for the five chemical model simulation M1–5.

Species ratio M1 M2 M3 M4 M5

CH3OH/H2O 4 11 14 4 10
CH4/H2O 2 2 2 2 2
HNCO/H2O 2 1 6 0.5 2
NH3/H2O 15 6 15 6 6

Notes. The three-phase model assumes a H2O abundance with respect to hydrogen of 2.66 × 10-7nH for the ice surface and 1.46 × 10-4nH for the ice bulk.

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