Average of the mean cloud particle size for particles in the optically thin atmosphere ⟨ ⟨ a ⟩ ⟩ [μm], (defined asthe average above the pressure, as defined in Eq. (22) and shown in Fig. 9). Four cloud particle cases are shown: monodisperse distribution of compact particles (black), Gaussian distribution of compact particles (red), monodisperse distribution of highly micro-porous particles f_por = 0.9 (blue), and Gaussian distribution of highly micro-porous particles (green). The inverted y-axis aids comparison with Fig. 9.