Results of the injection and recovery test for the pre-eclipse Fe (Sect. 5.2). The red and black posterior distributions represent independent sub-chains of the same MCMC chain, both converging to similar distributions. Upper right: the retrieved T–P profile computed from 10,000 random samples of the MCMC; the solid red curve shows the median profile and the shaded regions show the 1σ and 2σ contours. The dashed black curve shows the injected T–P profile.