Color snapshots of the vertical velocity field u_z (top) and radial magnetic field B_x (bottom) in the poloidal plane (x, z). Left panel: LB_2m at Re = 908. Right panel: MHD state integrated from the same initial condition, but at Re = 5000. Rm = 3030 in both cases. The snapshots are taken at the time t = 5 S^-1 around which the first reversal of LB_2m occurs. The dashed black lines are iso-contours of u_z, the full black lines with arrows are poloidal velocity streamlines.