V_ϕ vs. [Fe/H] for the identification of Splash. The 2D density plots (panels a–e) are colour coded according to the number of stars per bin in log scale. The major debris contaminants, namely GSE and Sagittarius, are excluded from these plots. Panels (a), (b), and (c) show stars from the age sample, while panels (d) and (e) show red giant stars with log(g) > 3 from the full sample. Panels (a) and (d) show the canonical Splash region (magenta box) defined by −100 < V_ϕ < +100 and −0.7 < [Fe/H] <   − 0.2. Panels (b), (c), and (e) show the region of the kinematic thick disc (red box) defined by velocity 100 <  V_ϕ < +180. We also define the low-[α/Fe] Splash region as −100 < V_ϕ < +100 and −1.0 < [Fe/H] <   + 0.5.