Example emission line profiles and their evolution with varying wind parameters. These have all been re-normalised to have the same total flux, and have all been calculated for an observed inclination of 45 degrees. Each panel shows the effect of varying an individual parameter, given in the top left corner of each panel. When not being varied, parameters are fixed at: ṁ_w= 10⁻², r_in = 700, r_out = 3r_in, $d_f=\sqrt{3}{r}_{\mathrm{in}}$, f_cov = 0.6, v_∞ = 10⁻³, r_v = 100, β = 1, κ = −1. These are all viewed at an observer’s inclination of i = 45 degrees. The parameter choices for d_f are chosen such that they correspond to wind opening angles on the inner edge of α_min = 60° ,45° ,30° ,20° , and 10° (see Fig. 1 for a definition of the opening angle).