Sketch of the vertical structure in our atmospheric model. ILAY denotes each of the slabs into which the atmosphere is divided, each with thickness H_g ∕2. Gas density decreases exponentially with height. The atmosphere is assumed to contain CH₄, with a certain fraction . We include acloud with optical thickness τ_c and a geometrical extension Δ_c. The positionof the cloud top is specified by τ_c→TOA. In addition, the aerosols of the cloud are described by their single-scattering albedo ω₀ and effective-radius r_eff, as explainedin the text.