tokens: ACKNOWLEDGEMENTS WEK was supported by an ESO Fellowship and the Excellence Cluster Universe, Technische Universität München, Boltzmannstrasse 2, D-85748 Garching, Germany. Support for program #13432 was provided to KSL and PFW by NASA through grant HST -GO-13432 from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. PFW acknowledges additional support from the NSF through grant AST-1714281. We would like to acknowledge the detailed discussions and input from Marten van Kerkwijk and Kim Venn during the preparation of the HST proposal that led to the observations reported here. We would like to acknowledge the helpful comments by our referee.
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