NIR (dereddened) CMDs of the target galaxies, ordered by increasing luminosity. Representative photometric errorbars are plotted along the CMDs. The red dashed lines indicate the expected position of the TRGB as a function of metallicity (see text for details). The green lines are isochrones with a fixed age of 10 Gyr and spanning the metallicity range of each target galaxy, with the same values as in Fig. 1. The blue solid lines indicate the 50% completeness limits.