Median vertical velocities, Ṽ_Z, of the giant sample as a function of height, Z, for four azimuth slices: [−30, −15] degrees (upper left panel), [−15, 0] degrees (upper right panel), [0, +15] degrees (lower left panel), and [+15, +30] degrees (lower right panel). The curves correspond to different ranges of galactic radius: R ∈ [6, 8] kpc (blue), [8, 10] kpc (orange), and [10, 12] kpc (green). The shaded areas represent the ± 1−σ uncertainties on the median vertical velocities.