JWST simulation with constant chemistry assuming ID atmosphere for the thermal structure. Shown are the main absorbers volume mixing ratio profiles at the equator on GJ 1214 b. Substellar point at 180° longitude. Overplotted are the best species profiles of Free, ACE, FastChem and GGchem retrievals (black solid, dashed, dotted, and dash-dotted lines, respectively). The retrieval having the highest Bayes factor is plotted in red.