Timescale (logarithmic scale) associated with the different mechanisms responsible for angular momentum transport as a function of stellar radius (logarithmic scale) for a model with mass of 1.3 M_⊙ and 𝒩 ∼ 30 (close to RGB bump). The line colour indicates the angular momentum transport mechanism. The top (bottom) panel corresponds to models with (without) radiative damping, respectively. The vertical grey lines show the position of the hydrogen-burning shell (labelled as H-shell) and of the chemical discontinuity (labelled as μ-disc.), respectively.