Evolution of the normalised frequencies of non-radial ℓ = 1 modes with radial orders n = [10, 11, 12] for evolutionary tracks of the stellar grid with masses between 1.23 and 1.26 M_⊙ as a function of the various age proxies considered for interpolation: τ (left), τ_scaled (middle), and ρ_c (right). Different colours are used to represent different stellar masses and different line styles show different radial orders, according to the insets in the middle and right panel, respectively.