Colour-colour plot of the ERO Dorado features, for both total flux photometry (square labels) and GCs photometry (round labels). The colours are given in magnitude. The interpolated metallicities and ages are obtained using the PEGASE (Le Borgne et al. 2004) single stellar population (SSP) model. However, the colour-coded area is consistent in age and metallicity across all the other SSP models tested. The feature labels are taken from Fig. 12. Their magnitude and colours are available in Table 5.