KELT-7b atmospheric retrieval of the transmission observations assuming thermochemical equilibrium (top panel) and free-chemistry (middle panel). The solid curves with shaded areas show the median and 1σ span of the posterior model spectra for PYRAT BAY (blue) and PLATON (pink), displayed at a resolution of R = 150. The black circle markers with error bars show observations used to constrain the models. The diamond markers show the model spectra integrated over the observing bands. Bottom panels: Posterior distribution of the model parameters (same color coding as above). The labels on top of each posterior show the mean and 1σ uncertainties for each parameter posterior (denoted with a dashed line and shaded area, respectively). Some parameters have been omitted from this figure (see Table 5 for the full list of free parameters).