Comparisons of visualizations of J_z(x, y) for Runs 2m5 and 2m6 with Pr_M = 10 and 8192² (left) and 16384² (right) mesh points at times t = 1, 10, 100, and 464. In each panel the lengths of the dotted, dashed, and solid lines denote the values of ξ_M, 5 L_c, and 500 δ_c. The bottom right panel shows the same current sheet that was presented in Fig. 14 as a blow-up. The thick white line in that panel at (x, y) = (0.27, 0.25) marks the location of the cross section shown in Fig. 15.