Poloidal cut of a self-similar, axisymmetric MHD DW for our reference solution (L5W17). Selected flow surfaces are plotted in red. Four important model parameters affecting predictedrotational signatures are illustrated here: the inner and outer launching radii, r_in and r_out, of the wind-emitting region (taken as 0.5 au and 8 au in this graph); the magnetic lever arm parameter λ_BP (here = 5.5) , with r₀ the launch radius and r_A the cylindrical radius reached on the Alfvén surface (in dashed dark blue); and the widening factor , where r_max is the maximum radius reached by the streamline (here = 17, reached at z∕r₀ ≃ 200). We note that due to self-similarity, all flow surfaces are homologous to each other and therefore share the same λ_BP and .