Size-dependent component of the terminal velocity of the dust grains assumed in the Monte Carlo model. Model 1 corresponds to the random velocity distribution found by Rotundi et al. (2015), Model 2 corresponds to the steep, most probable value, v ∝ r-0.96 found by Della Corte et al. (2015), and Model 3 to the less steep dependence given by v ∝ r-0.42. The escape velocity at 20RN is also indicated.
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