Snapshot of the initial magnetic field strength and topology. The same configuration is found for all azimuthal angles due to the axi-symmetry of the equilibrium. The location and strength of the shifted driver (used in both WD2 and WD3) is shown by the purple bar on the horizontal axis. The positions of field lines 1, 2, and 3 are also indicated and used for the discussion in the text. Contours for the plasma-β = 1 layer and transition region are denoted by the green and grey lines, respectively.