Maps of the median PM in latitude (top) and longitude (middle and bottom) for RC stars in the nuclear region of the MW. As expected, the median latitude PM, ⟨μ_b⟩ is perfectly smooth and centered to zero, across the whole region. In contrast, the median longitude PM, ⟨μ_l⟩, shows a clear excess of stars with μ_l > 0 in the region of the NSD. In the bottom panel we reproduce the middle panel map, also showing the density contours of the Sormani et al. (2022) model (black), and the spatial regions analyzed in the following sections.