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Fig. 11
Evolution of the unperturbed frequencies fR (red) and fϕ (black) along Vθ, calculated numerically with the initial values R = 7.0 kpc, pR = 0 km s-1, ϕ = 90°, and ζ0 = 0 (see Eq. (5)). We note that fϕ is presented by two branches. The location of the co-rotation and 1/1 resonances is shown by the vertical lines.
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