Overshoot region (blue) and bottom of the convective zone (red) in the F1a (top left), F1b (top right), F3 (bottom left), and F5 (bottom right) models, for θ spanning from 30 to 150 ^o. The white line show the radius r_c at which the enthalpy flux crosses zero at a given latitude while the orange line signals the radius r₀ where the local enthalpy flux is equal to a tenth of the maximal enthalpy flux at the corresponding latitude.