Space–time evolution of the horizontally averaged azimuthal magnetic field, ⟨ B_y ⟩, as a function of time in run 1-OA-5-e. The run starts with odd symmetry for the azimuthal field. At t ≃ 1000 Ω^-1 a current layer forms and is ejected at t = 1410 Ω^-1, leaving an azimuthal field with even symmetry.