Hertzsprung-Russell diagram indicating the location of the target stars. Also plotted are evolutionary tracks from Brott et al. (2011) for SMC metallicity and no initial rotation. The dashed lines indicate isochrones in steps of 1 Myr. The dashed-dotted lines indicate the magnitude cut-offs for the three galaxies, and the dotted vertical line roughly indicates the division between O and B stars. The IC 1613 stars from Garcia & Herrero (2013) are plotted in red.