Particle sizes and Stokes numbers as a function of the cooling rate of our protoplanetary disc model at at r = 0.4 AU (top panel) and size distribution of corundum, enstatite, and iron at a specific cooling rate (bottom panel). All the species increase in size for decreasing cooling rates. The Stokes number increases quadrat-ically with the particle size above the size transition from Epstein to Stokes regime. Pure iron (Fe) and iron with sulfur (Fe+S) obtain the largest sizes and by far the highest Stokes numbers.