Angular momentum diffusion coefficient, ν as function of mass coordinate from the centre (left) to the surface of the star (right) for the same proto-WD as in Fig. 7. Processes included are Spruit-Tayler dynamo (st), Eddington-Sweet circulation (es), and electron viscosity (visc). Each panel (from top to bottom) corresponds to a profile as marked by the black arrows in Fig. 7 (from left to right). The grey dotted lines define lines of constant hydrogen abundance, from 10^-5 to 10^-2, while the black dashed line represents the hydrogen mass abundance.