Left panel: Normalized power spectra of the velocity ${\stackrel{\sim }{E}}_{\mathrm{K}}^{(\ell )}=E_{\mathrm{K}}^{(\ell )}/\sum _l{E}_{\mathrm{K}}^{(\ell )}$ and magnetic fields ${\stackrel{\sim }{E}}_{\mathrm{M}}^{(\ell )}=E_{\mathrm{M}}^{(\ell )}/\sum _l{E}_{\mathrm{K}}^{(\ell )}$ from DipB at r = 0.98R. The solid lines show the power spectra from early times (first 15 years) of the simulation, and the dashed lines the late times (last 15 years). Right panel: Temporal evolution of the dipolar contribution (ℓ = 1) of the power spectra of the magnetic field ${\stackrel{\sim }{E}}_{\mathrm{M}}$ from all the simulations. The values were normalized by ${\stackrel{\sim }{E}}_{\mathrm{M}}^{(1)}$ at the starting point of each simulation (at t₀ = 85 years), for a better comparison.