Distribution of axisymmetric and nonaxisymmetric magnetic components. Top: radial profile of the magnetic Rossby number Rb and the axisymmetric azimuthal field . Bottom: isovalues of the nonaxisymmetric component (positive in green and negative in black) are superposed to a meridional section of axisymmetric toroidal component of the magnetic field at a given time during the saturation phase of the dynamo. Parameters: Re = 2.75 × 10⁴ and Ra = 10⁹. The other control parameters are fixed as in Fig. 3. These parameters correspond to the fiducial run shown in Fig. 2 of Petitdemange et al. (2023).