Corner plot showing the 1D and 2D marginalized posterior distributions (histograms and contours) for the five planetary parameters retrieved from fitting the transmission spectrum using the smarter model. The subplots along the diagonal show the input atmospheric profiles as a function of pressure that were used to generate the synthetic spectrum for comparison against the vertically homogeneous (isothermal and evenly mixed) atmospheric models that were retrieved. The upper right inset shows the median retrieved spectrum bounded by 1σ and 3σ credible intervals derived from posterior samples. This particular retrieval result was for the case with ∼ 83% CO₂ and is representative of similar results obtained for the other planets in our synthetic sample.