Series of closed orbits in the plane of the Galaxy obtained using the rotation curve of Eq. (17). The spirals indicated in green represent the imposed perturbation; they coincide with the response density (red dots) up to 4:1 resonance. The red circle is the corotation radius (Rcor = 8.4 kpc). The perturbation amplitude is ζ0 = 600 km2 s-2 kpc-1. The yellow dot shows the Sun position.
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