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Caption: Figure 19.
Volume mixing ratios for select molecules, assuming chemical equilibrium and a clear atmosphere, obtained from POSEIDON (solid lines) when fitting the coadded spectrum. The shaded regions indicate the ±1σ−2σ model posteriors. The dashed lines are the abundances for H2O, CH4, CO, and H2S from the best-fitting VULCAN model in Table 3. From the forward model, these molecules are expected with VMRs <10−4 in stark contrast to the POSEIDON values where some trace molecules are found with VMRs > 0.01.
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