Snapshots of the horizontal (left) and vertical (right) velocities for the P′≡P − P_eq case (top) and L2′≡L2 − L2_eq case (bottom), where the evolution of the background has been removed. The isocontours of the neutral density spanning the range from the minimum to the maximum value are plotted for the P′ snapshots (top). The magnetic field lines are plotted over the L2′ snapshots as isocontours of the magnetic potential (bottom), with levels corresponding to values from 0.6 and , where is the maximum value of |A_y|.