a) Normal (B_⊥) and tangential (B_∥) components of B across and along the current layer are plotted in the z = 0-plane (solid lines) and the z = 0.2-plane (dashed lines). Obviously, the components that show a sudden switch in sign are the B_⊥ components. b) Total pressure perpendicular to the current layer in the z = 0-plane (solid line) and the z = 0.2-plane (dashed line). These are taken at t = 7 for the experiment using driver 1, η = 0 and 512³ resolution.