C/Os for synthetic planets in both of the ongoing and reset carbon erosion models. The data for each erosion model are separated on each panel by a dashed line. Each panel separates the planets by the proto-planetary disk metallicity. Left-hand panel: low metallicity, middle panel: solar-like metallicity (− 0.1 < [Fe/H] ≤ 0.1), and right-hand panel: high metallicity (0.1 < [Fe/H] ≤ 0.6). The different point shapes represent different initial disk masses. The colour of each point denotes the trap from which the planet originated: ice line (blue), dead zone (orange), and heat transition (green). Generally, there is a shift in the C/Os between planets growing in the reset and ongoing carbon erosion models. However, there are some exceptions: for example, the heat transition planet (green point) in the first panel has nearly the same C/O in both the reset and ongoing models (this is Planet C from above).