2D profiles of vertical (top) and horizontal (bottom) velocity in the red giant model at x = 7.77 × 1011 cm (marked by white vertical lines in Fig. 4). Locations where the vertical velocity Mach (supersonic down-flows, top panel) are marked with white contours, those where vz and vh exceed 1 Mach are contoured in black (contours start at Mach = ± 1.0 and are drawn at every ± 0.5 Mach thereof).
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