Comparison of all atmosphere of stationary solutions for 3D calcium abundances (tomographic view) without (left panels) and with ADH (right panels) in four contiguous slabs of a magnetic atmosphere, situated between log τ = −3.0 and +0.1 (Hammer equal-area projection). The depth interval of each slab is written at the top of each panel. The dark green colour corresponds to the solar abundance (6.36 ± 10%). The mass-loss rate is assumed to be uniform over the star (3.8 10⁻¹³ solar mass per year, or Z-loss = 8.36 10⁻¹⁵). In the last panel on the right, displaying abundances with ADH, Ca is slightly under-abundant (light blue) in some parts of the star at a depth of around log τ = 0.0, as in Fig. 6. In this slab, the Ca abundance differs very little from the solar value.