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Table 1

Disc-halo logarithmic potential.

ΔE z 0 z max σI3 maximum σI3 median

0.05 3.3 2.4 0.008 0.004
0.1 3.3 3.7 0.006 0.003
0.2 3.3 6.1 0.021 0.005
0.5 3.3 12.9 0.012 0.006

Notes. Maximum and median values of the quasi-integral dispersion σI3 (i.e. the relative error) for orbits with different energies ΔE: best fit of z0, maximal height zmax above the galactic plane for the shell orbits.

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