Total GC population vs galaxy I_E magnitude for the full sample of galaxies (upper panel, log scale on the y-axis) and for the sample limited to faint I_E < 15 galaxies (lower panel, linear y-scale). The full sample is represented by grey filled circles in the upper panel. Dwarf galaxies are symbol and colour-coded based on their GC richness score, as labelled. In the upper panel, we also report fits to the data using the sample of galaxies with 10 ≤ I_E ≤ 21 and N_GC ≥ 5 (dash-dotted line), as well as a broken linear fit (dashed line) obtained adopting a separation limit at I_E = 17. The dotted box in the upper panel shows the position of the box in the lower panel.