Excited radial orders for models with IGW mixing (Z_ini = 0.014, log D₀ = 3, α_ov = 0.2, no rotation) with three different exponents ζ describing the density dependence (see Eq. (1)). Filled black dots are excited in both models with and without microscopic diffusion, filled orange dots are excited in models with microscopic diffusion only and unfilled dots are non-excited modes. (a) 4 M_⊙, X_c = 0.34, (b) 9 M_⊙, X_c = 0.06.