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Fig. 13

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Dust-to-gas ratio at rT = 10 AU for the best-fit model of a T Tauri star (solid line), Herbig star (dotted line) and brown dwarf (dashed line). The gray line denotes a well-mixed model with a dust-to-gas ratio of 0.01. The surface temperature at this location corresponds to roughly 100 K, and therefore emits mainly in the mid-infrared.

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