Run of the density versus wind velocity for three models. The first one (solid line) has Ṁ = 1.0 × 10^-6   M_⊙   yr^-1, β = 1.0 and the second one (dashed line) has Ṁ = 4.3 × 10^-7   M_⊙   yr^-1, β = 2.0. In both cases, the mass-loss rate is the one need to fit the emission peak of He ii. The third model (dot-dashed line) has Ṁ = 4.3 × 10^-7   M_⊙   yr^-1, β = 1.0. All other parameters are the same as in our final model.