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Fig. 8

image

Gas phase abundances of selected species as a function of time. Solid and dashed black lines are for the multi-grain models with the cosmic-ray-induced desorption enabled and disabled, respectively. Gray lines with stars and circles, respectively, show the results from the single-grain model with and without the cosmic-ray-induced desorption. The dust temperaturein each model is kept constant at 10 K for all grains. Legends apply to all panels.

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