Heliocentric radial velocity against radial distance (bottom panel) and CaT-based metallicity (middle panel) from the FORS data are shown in black. The histogram in the top panel indicates the peak of M 75 at 188 km s, and the dotted and dashed lines in the bottom panel show the core- and half-light radii of the cluster. Red symbols in the bottom panel and the red solid line in the histogram plot refer to the MIKE sample.