Interpolation errors presented as a function of τ_scaled (bottom x-axis) and ρ_c (top x-axis) that resulted from the application of the full interpolation algorithm (cubic splines along tracks and linear across tracks). Results are shown for all ν_1, 11 mode frequencies of the subgrid of stellar models with f_ov = 0.00, when ρ_c is the age proxy for interpolation. The transition mass, between radiative and convective cores in the MS, is 1.182 M_⊙ for this choice of f_ov.