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Fig. 6

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Fitting the model containing all chemical species (termed the “reference model”) to the NIRSpec G395H spectrum (grey data points) previously published by Alderson et al. (2023). Corresponding to our findings in Fig. 4, the retrieval assuming grey clouds (left panel) uses an isothermal profile while the retrieval assuming non-grey clouds (right panel) uses a two-parameter temperature-pressure profile. In each panel, post-processing is performed to isolate the contribution of water, carbon dioxide, sulphur dioxide, clouds, and collision-induced absorption (CIA) due to hydrogen and helium. The natural logarithm of the Bayes factor between the retrievals with grey and non-grey clouds is 33.8, with the non-grey ones being strongly preferred.

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