Contribution profile of most major production and loss reactions for CO₂ in GJ 436 b. Positive values are production contributions and negative values are loss contributions. Black lines correspond to vertical mixing compensation, such as the sum in each layer is always zero due to steady state. Dashed lines are for V20, while solid lines are for V23. The contribution of photodissociation pathways to O(³P) and O(¹D) are combined, O(³P) being favored above 10⁻⁵ bar and O(¹D) being favored for lower pressures. The third column in the legend indicates the reaction type. “Photo” corresponds to photodissociations and “no M” corresponds to reactions without pressure dependence. The last column indicates which model includes this reaction.