Evolution of the scaled frequencies for the ℓ = 0 modes, with radial order n = 11, that resulted from applying the interpolation algorithm to the mass track with M = 1.245 M_⊙, presented as a function of τ (top) and τ_scaled (bottom), when each is considered as the respective age proxy for interpolation. The bottom panel displays a subplot that zooms on the region of the age proxy parameter space with the highest interpolation errors.