Energy E in (cm/s)² plotted as function of the degree ℓ and the frequency ω at the radius r₀ = 0.26 R_⊙ (model ref). Ridges are visible at high frequency, tending to the maximum Brunt-Väisälä frequency (about 0.45 mHz). Black crosses represent the frequencies predicted by the oscillation code ADIPLS for order ℓ ∈ [1,50] and radial number n ∈ [0,58]. We have cut the horizontal axis to ℓ = 100 since no ridges are visible farther out.