Azimuthal variations of the density perturbation for the cold (solid), warm (dashed), and hot (dotted) disk components at different radii: R =5 (top panels), R = 7.5 (middle panels), and R = 10 kpc (bottom panels) and at different times: t = 0.3 Gyr (left column), t = 0.5 Gyr (middle column) and t = 1.3 Gyr (right column).
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