tokens: Based on observations with the 100-m Telescope of the MPIfR (Max-Planck-Institut für Radioastronomie) at Effelsberg. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. S.E.R. and R.J.S. acknowledge support from the DFG via the SPP 1573 Physics of the ISM (grants RA 2158/1-1 and SM321/1-1). R.J.S. also acknowledge support from the SFB 881 The Milky Way System.
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