The ACS/WFC CMD, for all the detected stars. The mean completeness levels (red dashed lines) and the photometric errors are shown. Over-plotted are 8  Gyr old reddened isochrones, from Pietrinferni et al. (2004) with  [Fe/H]  =  −2.7 dex (blue) and  − 0.2 dex (red). Distance modulus and the reddening used are μ₀ = 24.33 and E(B − V) = 0.08 mag. Isochrones and boxes have been used to select the populations. The blue (bRGB) and red RGB (rRGB) on either side of  [Fe/H]  =  −0.2 dex isochrone and the blue plume (BP) which is separated into bright (black box), intemediate (magenta box) and faint (dark green box) components.