Propagation diagram for all of the optimal models presented in Sect. 4.2.1. The Brunt-Väisälä frequency of the models without overshooting (resp. with α_ov = 0.15) is represented as a function of the reduced radius in dark blue (resp. light blue). The Lamb frequency of dipolar modes is shown in brown (resp. beige) for models without (resp. with) overshooting. The black continuous line corresponds to the frequency at maximum power and the dashed black lines correspond to the observed frequency range.