Growth maps showing final masses (colours) and selected final positions (black contours) of protoplanets starting at 1–50 AU distance from the star between 0 and 3 Myr of disc evolution. The four panels show the results for different values of the pebble-to-gas flux ratio ξ. The starting points of the selected growth tracks from Fig. 4 are indicated with dots. The cores of cold gas giants akin to Jupiter and Saturn start their assembly here in the 20–30 AU region for nominal values of ξ = 0.01–0.02. Higher values of ξ allow core assembly closer to the central star, starting in the 10–15 AU region.