tokens: This work has been supported by the Australian Research Council (grants FL110100012, FT140100554 and DP120100991). JM thanks support by FAPESP (2012/24392-2). DLL thanks the Robert A. Welch Foundation of Houston, Texas for support through grant F-634. TB was supported by the project grant ‘The New Milky Way’ from the Knut and Alice Wallenberg Foundation. Australian access to the Magellan Telescopes was supported through the Collaborative Research Infrastructure Strategy of the Australian Federal Government. The Canada–France–Hawaii Telescope is operated by the National Research Council of Canada, the Institut National des Sciences de l'Univers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii. The Hobby–Eberly Telescope is a joint project of the University of Texas at Austin, the Pennsylvania State University, Ludwig-Maximilians-Universität München, and Georg-August-Universität Göttingen.
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