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Grain surface abundance per total atomic hydrogen and per grain size bin for various molecules at the final stage of integration (i.e., 5 106 yr) as a functionof the grain radius a in relation to the grain temperatures. The crosses stand for the multi-grain model at 30 au, the squares stand for the multi-grain model at 100 au, and the circles stand for 200 au. The triangles pointing upward represent the surface abundance in the single-grain model HUV-LH-Tg (grains of size 0.1 μm) and the triangle pointing downward represents the abundance in the single-grain model HUV-LH-Ta, both at 100 au. Abundances being per grain size bin, the sum of the abundances in the multi-grain models should be compared to the abundances in the single-grain case.
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