Evolution of the efficiency of AM redistribution, parametrised by the additional viscosity ν_add, as a function of the radius normalised to the radius at the end of the MS. Black dots with R/R_TAMS < 2 correspond to subgiants studied by Deheuvels et al. (2020) and Eggenberger et al. (2019b). The other symbols correspond to red giants in the phase of hydrogen-shell burning with different initial masses and finally to the estimate for red clump stars based on a 1.2 M_⊙ model.