Stellar density maps of the N-body model in (X,Y) (left) and (X_g,Y_g) coordinates (right, see Eq. (1) for the guiding coordinates transformation). The solid lines highlight a region of 60° in azimuth, comparable to the coverage in the MW of the Gaia RVS sample. The dashed lines limit the region we adopt in the analysis of R−v_ϕ-ridges, and an SNd-like region (0.2 kpc, solid line circle) is placed at Y = −8.0 kpc.