tokens: The Parkes telescope and the ATCA are both part of the Australia Telescope which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. Financial support for this work was provided by the Australian Research Council. This research has made use of NASA's Astrophysics Data System Abstract Service; and the SIMBAD data base, operated at CDS, Strasbourg, France. SLB is the recipient of an Australian Research Council DECRA Fellowship (project number DE130101270). The authors dedicate this paper to the memory of J. L. Caswell, who was the driving force behind the MMB survey, and will continue to inspire maser studies for years to come.
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