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Fig. 5
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Representation of the Δ χ2 with the best fit compared to the K2-18 b observation (Madhusudhan et al. 2023) and the 1D models. The 2D map goes over the range of metallicity and C/O ratio, collapsed in Kzz with best χ2 values. The 2D map is zoomed for C/O ratio ≤ 10 since above this value it follows the same trend.
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