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Fig. 2.

image

Temporal evolution of the fractional abundances of CH4, CO, total JCH4, sublimable JCH4, total JCO, and sublimable JCO in all models. The letter J represents species on the grain. The temperature is labelled on the top horizontal axis. For total JCH4 and JCO, the curves from all models except the two-phase model are almost the same.

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