Observational (black histogram) and predicted H30α profiles varying different input parameters: a) predicted H30α profiles for terminal velocities of the ionized wind of 40, 60, 80, and 100 km s^-1 (red, blue, green, and cyan). It is clearly shown that the wing humps are shifted to larger radial-velocities with increasing terminal velocities. b) predicted H30α profiles for opening angles for the Keplerian ionized layer, θ_d, of 4.5° and 15° (blue and red lines). c) predicted H30α profiles for electron temperatures for the ionized outflow, T_o, of 10 000 and 12 000 K (red and blue lines). d) predicted H30α profiles for electron temperatures for the Keplerian ionized layer, T_d, of 8500 and 12 000 K (red and blue lines).