Left: échelle diagrams of the best-fit models with low overshooting (green) and with high overshooting (red). The squares represent ℓ = 0 modes, triangles ℓ = 1 modes, and diamonds ℓ = 2 modes. The observations are represented by the black filled circles. Right: evolutionary tracks in the HR diagram of the two models (green dashed line: low overshooting; red solid line: high overshooting).