Fig. 6.
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Characteristic curves 
of the periodic families x1 (black), x2 (red), and x3 (blue) for the model of Eq. (8) with Ωsp = 15 km s−1 kpc−1 and density of the spiral potential ρ0 = 5 × 107 M⊙ kpc−3. The dashed black vertical lines correspond to the first and second ILR, and the dashed gray vertical line corresponds to the 4:1 resonance.
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