Parameters of the initial model atmosphere as a function of the vertical coordinate, z. Top left: density of neutrals in the models with the original (red) and enhanced (dashed green) density contrasts, and density of charged particles (blue). Top right: same for the pressure of neutrals and charged particles. Bottom left: temperature of both the charged particles and neutrals. Bottom right: modulus of the magnetic field in the models with the original (red) and enhanced (green) density contrasts.