tokens: ACKNOWLEDGEMENTS 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, Inc., under NASA contract NAS 5-26555. These observations are associated with programme #12310,#11522. The authors gratefully thank Dr. R. Bouwens and Dr. E. Wisnioski for sharing their catalogues. The authors are also thankful to the anonymous referee for comments and suggestions that helped improve the manuscript. AA, GÖ, and MH acknowledge the support of the Swedish Research Council (Vetenskapsrådet) and the Swedish National Space Agency (SNSA). MH acknowledges the continued support as a Fellow of the Knut and Alice Wallenberg Foundation.
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