Slice at y=0 for the time t=489.3 s of the magnitude of the current density. The quantity plotted is the base 2 logarithm of |J|, and the limits of the color bar of –13.5 and –9.5 correspond to |J|=8.6×10⁻⁵ A/m² and |J|=1.38×10⁻³ A/m², respectively. The in-plane magnetic field lines are overplotted by blue lines and the orange arrows indicate the in-plane decoupling velocity, the projection in the xz plane of the quantity v_n−v_c. The perturbed null point is shown by a red dot. The isocontours of the decoupling in temperature, T_n−T_c, are shown by green lines, indicating three values of 10, 30, and 50 kK (darker green for a larger value).