Final core masses of planets that start with planetary seeds at r₀ and t₀ for the disc with Z_dust = 0.5%. The top features a water-to-silicate ratio of 3:1, while the bottom plot features a water-to-silicate ratio of 1:3. The blue and white lines have the same meaning as in Fig. 5. Planets that are below the top yellow line have a core mass of at least 10 Earth masses, planets that are below the second yellow line from top have core masses of at least 20 Earth masses. The final core mass is determined by the pebble isolation mass, which increases with orbital distances, because H/r increases. However, at the outer edges of the disc, pebble accretion is not that efficient any more, so that pebble isolation mass is not reached, leaving the final core mass lower than at smaller orbital distances.