Kippenhahn diagram for the same proto-WD as in Fig. 4, including both element diffusion and rotational mixing. The intensity of the orange and indigo colour indicates the ratio of the spin angular velocity to the orbital angular velocity, Ω/Ω_orb, as shown on the colour scale to the right. The green areas and the dotted white lines have the same meaning as in Fig. 4. The black arrows point to the position of the profiles in Fig. 8.