Top: (V, B − I) CMD illustrating the selection of blue HB (blue points), red HB (pink), and red clump stars (red). The RRLs are plotted as green circles. The upper portion of the top panel shows the colour histogram of the pink, red, and full sample (in black). Bottom: Cumulative distribution vs the galactocentric radius of the four HB subsamples. This indicates that the redder the component, the higher the central concentration.