Shell-averaged values of (panel a) and p/ρ_g (panel b), which are the measures of the entropy and the temperature, respectively, as a function of the distance from the planet. We set γ = 1.4. Different colors correspond to different planetary masses. The filled circles, the squares, and the triangles denote the atmospheric radius, the Bondi radius, and the Hill radius, respectively. We set ℳ_hw = 0.