tokens: Acknowledgments We thank Diederik Kruijssen and Henny Lamers for constructive and helpful discussions on cluster mass-loss. We, in particular FN, NB, IP and VK-P, gratefully acknowledge financial support for this project provided by NASA through grant HST-GO-14069 for the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS526555. NB gratefully acknowledges financial support from the Royal Society (University Research Fellowship) and the European Research Council (ERC-CoG-646928-Multi-Pop). We are grateful to Jay Anderson for sharing with us his ePSF software. DG gratefully acknowledges support from the Chilean BASAL Centro de Excelencia en Astrofsica y Tecnologas Afines (CATA) grant PFB-06/2007.
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