Poincaré diagrams and their respective families (x1,x2) of perturbed periodic orbits (see Contopoulos 1975, for details). In both cases we set the energy at Rc = 2.2 kpc, and the perturbation parameters are the same as Table 1. The only difference is the bulge fraction fb; at the top we have fb = 3.2 and below we have fb = 0.
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