Vertical (left) and horizontal (right) velocity maps in a typical 3D snapshot of the red giant model constructed at different geometrical depth, z, with z = 0 set at log τRoss = 0 and increasing towards the stellar center. Locations where the vertical velocity Mach (supersonic down-flows) 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). Vertical lines mark the x position (x = 7.77 × 1011 cm) at which the 1D velocity profiles shown in Fig. 8 were taken.
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