Final core masses of planets that start with planetary seeds at r₀ and t₀ for the disc with Z_dust = 0.1%. The top features a water-to-silicate ratio of 3:1, the bottom plot a water-to-silicate ratio of 1:3. The coloured lines have the same meaning as in Fig. 7. The final core masses are lower compared to the Z_dust = 0.5% disc, because of the lower pebble isolation mass in the outer disc. This also means that planetary seeds can reach pebble isolation mass at larger orbital distances and later times compared to seeds in the Z_dust = 0.5%.