Variation in the Maximal Lyapunov exponent with the dark halo flattening qz. The halo orientation is fixed to φ = 90. The higher exponent values, corresponding to the most strongly chaotic orbits, are found with the lowest initial velocities (red curves). The inset shows the range of qz values where the HC2 and HF2 orbits are chaotic (otherwise they are regular).
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