Same plot as in Fig. 3, but for two representative flow velocities 0 and 300 km s⁻¹, indicated by the symbols. Left panels show the results at a temperature of 20 kK and right panels at 100 kK. The upper panels show the same plot for the effective thickness dependence for a given height of 4 R_⊙. Different thicknesses are indicated by different colors. The lower panels show the height dependence at a given thickness of 10 000 km. Different heights are indicated by the colors.