tokens: ACKNOWLEDGEMENTS SDC and SW acknowledges support from the ERC starting grant No. 679852 ‘RADFEEDBACK’. APW, ADC and PCC gratefully acknowledge the support of a consolidated grant (ST/N000706/1) from the UK Science and Technology Facilities Council. STS acknowledges funding by the Deutsche Forschungsgemeinschaft (DFG) via the Sonderforschungsbereich SFB 956 Conditions and Impact of Star Formation (subproject A4) and the Bonn-Cologne Graduate School. RLS gratefully acknowledges the support of a UK Science and Technology Facilities Council postgraduate studentship. SEJ gratefully acknowledge the support of postgraduate scholarships from the School of Physics Astronomy at Cardiff University and the UK Science and Technology Facilities Council. SW further thanks the DFG for funding through the Collaborative Research Center (SFB956) on the ‘Conditions and impact of star formation’. PCC acknowledges support from the European Community’s Horizon 2020 Programme H2020-COMPET-2015, through the StarFormMapper Project (number 687528). SDC would like to thank Volker Ossenkopf for useful discussions about radiation transfer. The authors would also like to thank the anonymous referee for their helpful comments on the paper. This work was performed using the facilities of the Advanced Research Computing at Cardiff Division, Cardiff University.
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