Comparison between the residuals in the vertical coordinate Δ_Z = Z - Z_WARP (left panel), the median radial motions V_R (middle panel) and the residuals in the vertical velocity Δ_VZ = V_z — V_Z,WARP for the young giant sample. Dashed lines give a rough indication of the region where positive residuals Δ_Z are obtained with this sample. Dotted lines are the same, but shifted by half the amplitude of the region (see text).