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tokens: We thank the anonymous referee for the careful and constructive comments that greatly improved this paper. This paper is based on observations made with the NASA/ESA Hubble Space Telescope , obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, under NASA Contract NAS 5-26555. These observations are associated with Program 13364 (LEGUS). Support for Program 13364 was provided by NASA through a grant from the Space Telescope Science Institute. This research has made use of the NASA/IPAC Extragalactic Database (NED) operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. D.A.G. acknowledges financial support by the German Research Foundation (DFG) through grant GO 1659/3-2. M.F. acknowledges support by the Science and Technology Facilities Council (grant number ST/L00075X/1).