tokens: Acknowledgments I wish to thank Eduardo Balbinot, Nora Shipp, Alex Drlica-Wagner for the comparison between my MW stream candidates and theirs; and Elizabeth Buckley-Geer, Huan Lin, Paul Schechter and Tommaso Treu for discussions on quasar lens searches. Careful comments by the anonymous referee have led to clarifications and improvements of this paper. I gratefully acknowledge hospitality by the ITC-Harvard, where this work was completed. This research has made use of the NASA/ IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This work has made use of data from the European Space Agency (ESA) mission Gaia ( https://www.cosmos.esa.int/gaia ), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium ). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.
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