Size distributions at different radial distances for the M_⋆ = 1 M_⊙ run before switching on sublimation. The quantity on the vertical axis, A, is the cross-section density per unit size decade (see Appendix C.2), which is horizontal if all sizes contribute equally to the cross-section. The gray band indicates the slope of a size distribution that follows the classical Dohnanyi (1969) power law (n(s) ∝ s^-3.5, hence A ∝ s^-0.5). The vertical lines mark the particle sizes corresponding to relevant values of β.