Comparison among TP profiles computed considering different assumptions for reference pressure, atmospheric composition, and number of layers. Top: Comparison between CLOUDY TP profiles obtained when fixing the planetary transit radius to the reference pressure (p₀) values of 100 mbar (blue), 6 mbar (black), and 1 mbar (red). Middle: Comparison between CLOUDY TP profiles computed when accounting for metals plus only hydrogen molecules (black) and for metals plus all molecules present in the CLOUDY database (red). Bottom: Comparison between CLOUDY TP profiles obtained considering different numbers of layers, as indicated in the legend. For visualisation purposes, the TP profiles are rigidly shifted horizontally by the value indicated in the legend.