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Fig. 4

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Sketch of the two-population representation of the size distribution. The solid black curve is an arbitrary dust size distribution with the upper limit of afrag. The dark shaded area is the small population, i.e. the part of the size distribution which is not influenced by drift velocities because particles of these sizes are low enough to be tightly coupled to the gas. The light gray area is the large population, i.e. the grains that are significantly drifting inwards. The total mass contained in the small and large population is given by Σ0 and Σ1, while the representative size is a0 and a1, respectively.

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