Fig. 8
Time evolution of the main volatile species at 10, 20 and 30 AU, plotted on linear scales to ease comparison to Fig. 7 of Yu et al. (2016) and Fig. 2 of Yu et al. (2017). The H2O ice abundance in these plots is at least 80. A rapid decrease of gaseous CO is seen within 1 Myr. The CO2 ice is plotted at half its abundance to emphasize the steep drop for CO gas before 1 Myr at all three radii.
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