tokens: Acknowledgements TB acknowledges support from Fundação para a Ciência e a Tecnologia (grant SFRH/BPD/122325/2016), and support from Center for Research Development in Mathematics and Applications (CIDMA) (strategic project UID/MAT/04106/2013), and from ENGAGE SKA, POCI-01-0145-FEDER-022217, funded by COMPETE 2020 and FCT, Portugal. DRGS and BR thank for funding through Fondecyt regular (project code 1161247). BR thanks Conicyt for financial support (CONICYT-PFCHA/MagísterNacional/2017-22171385). DRGS, MF, and AMS acknowledge funding through the ‘Concurso Proyectos Internacionales de Investigación, Convocatoria 2015’ (project code PII20150171) and the BASAL Centro de Astrofísica y Tecnologías Afines (CATA) PFB-06/2007. DRGS is further grateful for funding via ALMA-Conicyt (project code 31160001), Quimal (project code QUIMAL170001), and the Anillo program ‘Formation and Growth of Supermassive Black Holes’ (project code ACT172033). RSK acknowledges financial support from the Deutsche Forschungsgemeinschaft via SFB 881 ‘The Milky Way System’ (sub-projects B1, B2, and B8) and SPP 1573 ‘Physics of the Interstellar Medium’. LH and RSK were supported by the European Research Council under the European Community’s Seventh Framework Programme (FP7/2007–2013) via the ERC Advanced Grant ‘STARLIGHT: Formation of the First Stars’ (project number 339177).
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