Mass-weighted particle size distribution for the full temperature-dependent nucleation model (blue) and the simple model (red), for three radial sections of the simulation domain. A black dotted line shows the initial state, where the mass is divided equally between micrometre-sized particles with a thin ice mantle and millimetre-sized particles consisting of a micrometre-sized silicate nucleus and a thick ice mantle. The mass in solids in each radius bin and in the full simulation region is denoted by m_bin and m_tot, respectively. (a) In the region interior to the ice line, sublimation dominates and thus all solids at t = 1000 yr are in the form of bare, micrometre-sized dust grains, regardless of the model. (b) Particle growth in the region around the ice line is model dependent: in the full model both dust and pebbles grow, with a significant fraction reaching centimetre sizes, whereas in the simple model mainly micrometre-sized particles grow, reaching sizes of at most a few microns. (c) In the outer region, particle growth is inefficient for both models and the size distribution here is instead set by inwards drift of millimetre-sized particles and turbulent diffusion of micrometre-sized dust.