Fig. 14
Mass-metallicity diagram for Solar System giant planets and exoplanets. Our estimation for K2-18b with solar C/O ratio isindicated with a green double arrow. Metallicity for Solar System giant planets is based on CH4 abundance. The grey dashed line corresponds to the linear fit (in log log diagram) for Solar System planets and assuming that the metallicity cannot be lower than 1. Figure adapted from Wakeford et al. (2017) and Wakeford & Dalba (2020).
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