V_ϕ distribution for stars with PGS metallicities between –1.7 and –4.0. From top to bottom: panels 1 and 2: PGS decontamination by APOGEE. Panels 3–8: folding of the retrograde counterparts over the prograde counterparts of the decontaminated PGS. The black dashed line indicates the location of our presumed halo. In panel 3, the folding is done assuming a theoretical halo. In the remaining panels, it is done assuming a prograde halo shifted by 10 km.s⁻¹ at every panel. The red dashed lines delimit the location of the population we aim to characterise.