Vertex deviation, (l_v) and anisotropy, (β) as a function of Galactic latitude, |b|, for the NSD (black curves) and S-NSB model with varying values of the nuclear bar angle, α (coloured curves). As expected, the NSD has l_v ≈90° in the midplane. In contrast, the midplane values for the S-NSB model are dependent on α. Across all model configurations, both l_v and β converge to roughly similar values at |b| ≥ 0.5°. This marks the latitude at which contamination from large-scale bar stars dominate the density distribution.