Ratio of the extent of the lower overshooting layer (ℓ_so^L) over the extent of the upper overshooting layer (ℓ_so^U) given by the mixture model, (a) versus the depth of the convective shell, measured as R_CB^L/R, and (b) versus the width of the convective shell measured as (R_CB^U−R_CB^L)/H_p, CB^L. Error bars indicate one standard deviation around the mean value. A pink line indicates a linear regression fit.