Pairs of snapshots of the horizontal and vertical decoupling in velocities for the simulations P-WN (top left), P-WN-NN (top right), L1-WN-NN-B (bottom left), and P-WN-NN (bottom right). The snapshots are taken at the time indicated at the right-hand-side image of each pair. The maximum absolute values of the corresponding decoupling and velocity are indicated at the bottom of each image. The black lines represent the iso-contours of the absolute value of the y-component of the magnetic field potential, |A_y|. The iso-contours are equally spaced between 0.6 and , where is the maximum value of |A_y|.