Comparison of overshooting parameters α_ov = 0.50 (top panel) and α_ov = 0.15 (bottom panel) for 1 M_⊙ through the gradient and helium profiles as a function of the mass fraction at the same age, compared to the helium profile (black). The convective zone is in yellow; the overshooting layer is in green; the semi-convective zone is in blue; and the sharp variation left by the He-flash is in grey. The radiative gradient ∇_rad is in red, and the adiabatic gradient ∇_ad is in blue. The real gradient ∇ is defined as follows: ∇ = ∇_ad in the COS zone, and ∇ = ∇_rad in the radiative zone.