Leading-order perturbations on the frequencies of dipolar (l = 1, top panels) and quadripolar (l = 2, bottom panels) mixed modes in the studied 1.5 M_⊙ red giant star. Left panels: magnetic angular frequency splitting δω_mag (for B₀ = 1MG) of the m ∈ [ − l, l] modes. Middle panels: angular frequency splitting δω_rot for a plausible two-layer differential rotation (with Ω_core = 0.5 μHz and Ω_env = Ω_core/10) of the same mixed modes is represented. Right panels: combination of magnetic and rotational splittings of mixed-mode angular frequencies δω_tot = δω_mag + δω_rot. The vertical orange line indicates in each panel the expected frequency of maximum power of the modes ν_max. The ζ function is represented in each case by the grey dashed line.