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Fig. 6

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Dust-to-gas ratio at different times of dust evolution including radial drift and a bumpy gas surface density (Eq. (21)) with A = 0.4. Case of αturb = 10-3, vf = 10 m s-1, p = 0.5, Rout = 30 AU (top panel) and Rout = 60 AU (bottom panel).

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