Visualization of J_z(x, y) of Run 2m6 with Pr_M = 10, Lu = 1.8 × 10⁵, Lu_ν ≈ 5 × 10⁴, and 16384² mesh points at t = 464 for a small part of the domain with sizes 2.8ξ_M(t)×0.74ξ_M(t). The lengths of 100 δ_c, 2L_c, and ξ_M are indicated by horizontal white solid, dashed, and dotted lines, respectively. The thickness of the current sheet corresponds to about 3Δx ≈ 21 δ_c. In its proximity, there are also indications of ringing, indicated by the black circle.