Fig. 4.
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Snapshots of the energy flux at t = 1 (a), t = 7 s (b), t = 20 s (c), and t = 120 s (d) at the start of the simulation. Contours illustrate the evolution of the disturbance during propagation. White and red contours show the location of the energy flux maximum, which propagates downwards. The black contour shows the energy flux that propagates upwards.
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