Extended Data Figure 4.

Comparison between modelled compositions of a vapour depleted liquid and observed planetary compositions. Similar to Extended Data Figure 3, but for model runs with a CI chondrite initial composition. Observed Mg and Fe isotope compositions (panel b) are presented relative chondrite mean, while Si isotope observations are relative to a mean of carbonaceous and ordinary chondrites⁵⁹, because those chondrites have undistinguishable Si isotope compositions, yet are distinctly different from enstatite chondrites (see [4] and references therein).