Left: modal diagram: range of dimensionless frequencies for a 50 M_⊙ MS model (labeled B in Table 1) as a function of the degree ℓ of the mode. Stable modes are represented by gray points while excited modes are shown with solid blue circles. Right: propagation diagram for the same model. The solid red line stands for the Brunt-Väisälä frequency, and the Lamb frequency for three different degrees (ℓ = 1, 3 and 20) is represented by the dotted, dashed, and dot-dashed lines, respectively. The propagation zones for p and g modes with ℓ = 1 are highlighted by the dark gray and light blue shadow regions, respectively. The solid horizontal black line stands for an example of the propagation zones for a mode of ω = 1.0 with ℓ = 3.