Cloud properties for HR 8799 e, showing the optical depth due to clouds as a function of pressure (colour map), with the τ = 0.3 and τ = 1.0 contours highlighted by the dashed lines. The solid lines indicate the mass fraction abundance of the MgSiO₃ and Fe clouds in blue and red respectively. Left: cloud properties e.AB.13, using a freely retrieved cloud base pressure and abundances. Right: the same, but for Case e.AB.2, which uses the equilibrium condensation to determine the location of the cloud base. The abundances are determined using equilibrium chemistry, and retrieving a scaling factor, (log S_Fe = 0.0 ± 1.1, log $S_{{\mathrm{M}\mathrm{g}\mathrm{S}\mathrm{i}\mathrm{O}}_3}$ = −0.8 ± 1.0).