Departure from a linear splitting as a function of the radial order for (ℓ = 1,m = 1) triplets. Left: for Ω = 3.7% Ωk. Right: Ω = 7.4% Ωk – due to cubic-order effects (blue), cubic-order effects with near degeneracy (purple, the two of them overlap for most of the modes except g2) and to a latitudinally differential rotation of 12.7% (light blue) and 20% (green). Computations were made for a model of HD 181420 (M = 1.36 M⊙, see Table 3).
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