Same as Fig. A.1, but for models in which the shallow heating occurs at different depths in the outer crust. The solid line shows the results of model 1 (shallow heating in the density range Δ ρ_sh = [1−5] × 10⁹ g cm⁻³). The dashed-dotted curves shows the results for model 9, in which the shallow heating is placed closer to the surface, at a density range Δ ρ_sh = [2−10] × 10⁸ g cm⁻³, and the dotted curves show the results for model 10, in which the shallow heating is assumed to be located deeper in the crust (in the range Δ ρ_sh = [1−5] × 10¹⁰ g cm⁻³).