tokens: ACKNOWLEDGEMENTS We thank the anonymous referee for their thorough and careful reading of this paper and many constructive suggestions. We acknowledge Nicolas Peretto for help with CO data at the locations of some of our sources. HC, HLG, and PC acknowledge support from the European Research Council (ERC) in the form of Consolidator Grant cosmicdust (ERC-2014-CoG-647939). MJB and IDL acknowledge support from the ERC in the form of Advanced Grant SNDUST (ERC-2015-AdG-694520). MM acknowledges support from an STFC Ernest Rutherford fellowship (ST/L003597/1). Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
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