Hess diagrams of the GCs in the Fornax dSph, showing the observed data adopted for each cluster (top row), the data in the MW and Fornax field background reference region (middle row, scaled to the same area as the observed data), and the difference between the two (bottom row). For the outer four clusters, the level of MW and Fornax field contamination within the cluster aperture is low. We therefore multiplied the reference Hess diagram for these clusters by a factor 10 to highlight features in the CMD. Overlaid (solid) isochrones trace a metal-poor ([Fe/H] = −2.5 dex) population at a fixed age of 14 Gyr, taken from the Dartmouth Stellar Evolution Database isochrone set (Dotter et al. 2008). We also show for Fornax 4 a more metal-rich ([Fe/H] = −1.5 dex) isochrone at a fixed age of 14 Gyr as the dashed line. For each isochrone, we adopted the distance given in Table 1 that was derived from RR Lyrae stars.