tokens: Acknowledgements SPIRE has been developed by a consortium of institutes led by Cardiff Univ. (UK) and including: Univ. Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, Univ. Padua (Italy); IAC (Spain); Stockholm Observatory(Sweden); Imperial College London, RAL, UCL-MSSL, UKATC, Univ. Sussex (UK); and Caltech, JPL, NHSC, Univ. Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy); MCINN (Spain); SNSB (Sweden); STFC, UKSA (UK); and NASA (USA). PACS has been developed by a consortium of institutes led by MPE (Germany) and including UVIE (Austria); KUL, CSL, IMEC (Belgium); CEA, OAMP (France); MPIA (Germany); IFSI, OAP/AOT, OAA/CAISMI, LENS, SISSA (Italy); IAC (Spain). This development has been supported by the funding agencies BMVIT (Austria), ESA-PRODEX (Belgium), CEA/CNES (France), DLR (Germany), ASI (Italy), and CICT/MCT (Spain). V.K. would like to thank Richard Allison, and Richard Parker for their help and discussions on mass segregation with the MST method. This work has received support from the European Research Council under the European Union’s Seventh Framework Programme (ERC Advanced Grant Agreements no. 291294 – ORISTARS – and no. 267934 – MISTIC) and from the French National Research Agency (Grant no. ANR–11–BS56–0010 – STARFICH). D.A. acknowledges support by FCT/MCTES through national funds (PIDDAC) by the grant UID/FIS/04434/2019. N.S. and S.B. acknowledge support by the French ANR and the German DFG through the project GENESIS (ANR–16–CE92–0035–01/DFG1591/2–1). G.J.W. gratefully acknowledges support from The Leverhulme Trust. We also acknowledgesupport from the French national programs of CNRS/INSU on stellar and ISM physics (PNPS and PCMI). This research hasmade use of the SIMBAD database, operated at CDS, Strasbourg (France), and of the NASA/IPAC Extragalactic Database (NED), operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
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