Distribution of galactocentric total velocity (v_GC) versus galac-tocentric radius (r_GC) for HVSs ejected via the Hills mechanism from the center of the Sgr dSph, color coded by each star’s apparent magnitude in the Gaia RVS band. Results generated using the speedystar code assuming M_BH = 10⁴M_⊙, ejection rate η = 10⁻⁴yr⁻¹ and a Salpeter IMF (Salpeter 1955) with κ = 2.35. Solid, dashed, and dotted curves represent the escape-velocity profiles predicted by three Milky Way potential models (Bovy 2015; McMillan 2017; Cautun et al. 2020).