Fig. 2
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Spread in SiO2/MgO and FeO/MgO ratios in the mantles of prospective exoplanet compositions according to the Hypatia database. See Sect. 2.6 for modelling details. Contours denote the distribution withing the planets that contain FeO in their mantles, and define the levels where the distribution contains 16%, 50%, and 84% of probability mass (from inner to outer contour). The white dots represent hypothetical exoplanet compositions selected by a GMM. The mantle ratios SiO2/MgO and FeO/MgO are shown for the solar system planets Earth (McDonough & Sun 1995), Mars (Khan et al. 2022) and Mercury (Nittler et al. 2018). Venus is assumed to be similar to Earth.
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