Evolution of the magnetic field and electric current density. The evolution of the magnetic field components B_y(a), B_h(b), B_x(c), and the current density ﹩-{j}_{z}(d)﹩ from ﹩t=164{t}_{{\rm{A}}}﹩ to ﹩t=244{t}_{{\rm{A}}}﹩. The color-coded lines indicated ROIs (boxes 0–9) in Figure 3, in which these quantities are calculated. The same colors were used to identify the arrows that mark the minima of B_h and −j_z.