Results from a dynamical dynamo simulation including mean-field effects. Colour-coded lag in the rotation velocity v_φ(r,z) averaged over azimuth. Values | δv | > 30 km s^-1have been clipped for clarity. Top: Predicted deviation from the initial rotation profile based on the effect of the Lorentz force. Bottom: the actual deviation seen in the simulation, which appears more washed out owing to the effect of the turbulent viscosity but otherwise agrees markedly well (see also the lower panel of Fig. 9 in Gressel et al. 2013, for the actual field distribution).