Metallicity versus galactocentric radial velocity for all the targets in the GIBS fields. Orange points are stars observed in CaT, azure points are stars observed at high-resolution. The field at (0,−8) has a double RC: bright-RC targets are shown in green while faint-RC ones are shown in pink. The solid lines mark the ± 1σ interval around the mean velocity at three different metallicities. See text for details.