Intensity proflies at the extreme stellar limb of the nine MHD models. The solid lines are the fitted intensity profiles using the Claret-4 law. The dashed lines depict the result of radiative transfer calculations along tangential rays in the gray approximation. The dots to the right mark the position μ = 0 (the location of the stellar radius), and the dots to the left μ = 0.04. The solid lines end at dots marking μ = 0 as the stellar limb and limit of definition of the Claret–4 law. For clarity, the curves were scaled in steps of factors of two in the vertical direction, with model В = 0 G at its original position. In this plot, the zero points of the z-scales are located at a radial Rosseland optical depth of one in the respective model.