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Fig. 2

image

Top, from left to right: azimuthal slab through the normalized perturbation in azimuthal velocity (a), radial velocity (b), and surface density (c) for Stokes numbers 10−4–1. The perturbation in the gas is indicated in black as a reference. Bottom: streamlines that a gas parcel would follow along an orbit at r = 1.7 rpl. The maximum radial deviation is marked with a black dot as a guide for the eye to the effect of the pitch angle on the flow of the particles. The perturbation in line density (see text) is indicated in red, sharing the same shape and amplitude as the perturbation in surface density (panel c).

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