tokens: Based on observations obtained at the SOAR telescope, which is a joint project of the Ministério da Ciência, Tecnologia, Inovações e Comunicações (MCTIC) do Brasil, the U.S. National Optical Astronomy Observatory (NOAO), the University of North Carolina at Chapel Hill (UNC), and Michigan State University (MSU). A.K. gratefully acknowledges support from the German Research Foundation (DFG) via Sonderforschungsbereich SFB 881 (“The Milky Way System,” subproject A08). We thank C.I. Johnson and A. Mucciarelli for useful comments. We thank the referee for the thorough reading of the manuscript and timely suggestions to improve it.
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