[Ni/Fe] versus [(C+N)/O] plot, color-coded for each detected group. A kernel density estimation (KDE) plot of MW disk stars is shown with gray curves. These were selected from APOGEE DR17 following the same quality criteria as our halo stars, and V_ϕ ≥ 100 km s⁻¹. We note that [Ni/Fe] < 0 and [(C+N)/0] < −0.2 have been linked to ex situ stars. In this work, G2 (Splash) and G5 (Galileo 5) fall in the locus of accreted stars. G6 (Galileo 6) overlaps with the thick-disk population.