Normalised convective core mass M_core/M_ini over the normalised core hydrogen mass fraction $X_c^{\prime }$. The stars are colour-coded by their primary degree: l = 0 (green), l = 1 (blue), and l = 2 (orange). The shape represents the radial order: g₂-modes are represented by thin diamonds, g₁ by thin triangles, radial fundamental modes by triangles, p₁ by circles, and p₂ by squares. The grey tracks in the background show the evolution for the indicated masses with f_ov = 0.005 (solid, labelled at low $X_c^{\prime }$) and f_ov = 0.035 (dashed, labelled at high $X_c^{\prime }$). The typical uncertainty is indicated in the upper right corner.