Discrepancies on selected major species. Major species with discrepancies of more than 10% compared to the full model at any height are shown for (a) HD 209458b (without photochemistry), (b) HD 189733b (without photochemistry), (c) HD 209458b (with photochemistry), and (d) HD 189733b (with photochemistry). Top panels: Absolute abundances. Bottom left: Vertical profile of $\underset{\max }{\mathrm{\Delta }}$ for each subset of species. Bottom right: Maximum discrepancy for those species at each height. Note that in HD 189733b with photochemistry (d), the maximum discrepancy does not always map the species present because N₂H₃ is defined as a major species only at certain pressure levels.