R–V_z plane of initial conditions chosen along the Sun’s L_z-level, with p_R = 0 and z = 0. The equidistant levels of the maximal vertical deviation from the equatorial plane, z_max, are shown by continuous curves; its value mainly increases with the increasing V_z (see beside panel to associate the absolute z_max-values). The red curve shows the location of the circular orbits with L_z = 1995 kpc km s⁻¹ as a function of the initial V_z. The structures, which are characteristic of the e–z resonances, appear on both sides of the red curve, expanding their domains with increasing eccentricities. The blue curve shows loci of the very strong 1/1 resonance. The projection of the Sun’s orbit is shown by cyan dots; its maximal z-amplitude is around 0.85 kpc. Side panel: z_max-values as a function of the initial V_z, for circular orbits (red curve) and orbits with initial R = 13 kpc (black curve).