tokens: This work was supported by NSF grants AST-1105835 and AST-1440343. AL acknowledges support from the University of California Office of the President Multicampus Research Programs and Initiatives through award MR-15-328388, and from NASA through Hubble Fellowship grant HST-HF2-51363.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. The NASA funding for the eGSM is NASA grant no. NNX16AF55G. We acknowledge the use of the Legacy Archive for Microwave Background Data Analysis (LAMBDA), part of the High Energy Astrophysics Science Archive Center (HEASARC). HEASARC/LAMBDA is a service of the Astrophysics Science Division at the NASA Goddard Space Flight Center. 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. We wish to thank Jacqueline Hewitt, Gianni Bernardi, Douglas Finkbeiner, Aaron M. Meisner for helpful comments and suggestions, and Angelica de Oliveira-Costa for pioneering the GSM approach. We also wish to thank our anonymous referee for extremely helpful and detailed feedback.
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