Tracks for 100 separately evolved embryos at different starting locations with the same initial conditions. Right: same model choice as population L. Left: same model choice as population L_no. The colour separates icy planets (blue > 1%volatiles) from rocky planets (green), and the initial water ice line is plotted in blue (dashed). The furthest initial embryo forming a rocky planet and the closest initial embryo forming an icy planet are indicated with a black cross (×).