Left: Hα line profiles for cmfgen models with parameters as listed in Table 1. Black triangles represent the line profile with the same Q-parameter (Eq. (1)) as model C (T_eff = 12 500 K), but with different Ṁ and R_⋆ values. Right: Hα line EW vs. T_eff for models with only H (crosses), H+He (circles), and more sophisticated (triangles) models. Red asterisks represent the changes in the Hα line when the He mass fraction in the pure H+He models is increased to 60%. Blue squares indicate how the Hα EW behaves as a function of a constant Q value.