Fig. 4.
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Radial profiles of the azimuthal (top) and longitudinal (bottom) velocity components at t = 0 for the twist parameter ranging from c = 0 to c = 0.4. The inset in the top panel shows a close-up view of the azimuthal velocity around its maximum. Both velocity components are normalized to the maximum amplitude of the perpendicular velocity perturbation, v0.
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