Profiles of the logarithm of the diffusion coefficients (left axis) of the meridional circulation (D_eff), the vertical shear (D_shear = D_v), the overshoot (D_A), the parametric turbulence (D_T6.425), and the total transport coefficient (D_tot = D_eff + D_shear + D_A + D_T6.425) as a function of the radius normalised to solar radius at four different ages (10⁷ years, 5 × 10⁷ years, 10⁹ years, and solar age) for model . The abundance profile of A(⁷Li) is the orange full line (right axis). Hatched areas correspond to convective regions.