Panels a–d: B and B_z for case 2b (multiple wavelengths λ₁ = 2.0, λ₂ = 16.0, with increased amplitude on the smaller wavelength component such that δ₁ = 0.35) at time t = 8, 20, 28 and 350τ_A. The simulation reaches its final state much more rapidly than in case 2a due to the increased total flux. B_z was chosen to be displayed rather than J_z since, in this case, the island structure was more visible.