Propagation diagram for a 1.3 M⊙ post-main-sequence model with an ℓ = 1 avoided crossing. The Brunt-Väisälä frequency (black solid line) can be separated in two contributions: the part linked to the temperature stratification (long-dashed blue line) and the one linked to the gradient of mean molecular weight (red solid line). The Lamb frequency for ℓ = 1 modes is represented by the black dashed line. The shaded area indicates the evanescent zone. The radii r1 and r2 correspond to the turning points of the g-mode cavity and r3 the turning point of the p-mode cavity.
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