Chemical model abundances for the warm-up stage of a hot-core type model with a final collapse density of nH = 6 × 1010 cm−3 (high-density model, black lines for NH2CN and green lines for NH2CHO). Solid lines denote gas-phase molecules; dotted lines indicate the same species on the grains. The red lines correspond to the abundance profiles of gas-phase and grain-surface NH2 CN for the lower density model, run at nH = 1.6 × 107 cm−3.
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