tokens: Support for programme GO 11598 was provided by NASA through a grant from the Space Telescope Science Institute, operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. Much of the data presented herein were obtained at the W.M. Keck Observatory, which operates as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. Additionally, partial support for this work came from NASA ATP NNX12AH86G, HST grants HST-GO-11598 and HST-GO-12248, NASA ADP grant NNX08AJ44G, NSF grants AST-0847667 and AST-133514, and the South African National Research Foundation's Research Chairs programme. The simulations used here were run on computing facilities owned by the Carnegie Observatories. Computing resources used for this work were made possible by a grant from the Ahmanson foundation, and through grant DMS-0619881 from the National Science Foundation. Facilities : Keck: I (HIRES), Hubble (COS).
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