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tokens: ACKNOWLEDGEMENTS We thank Emanuele Giallongo, Andrea Grazian, Frederick Davies, and the anonymous referee for useful comments. This work is carried out within the Collaborative Research Centre 956 ‘The Conditions and Impact of Star Formation’, sub-project C4, funded by the Deutsche Forschungsgemeinschaft (DFG). We are thankful to the community developing and maintaining software packages extensively used in our work, namely: matplotlib (Hunter 2007 ), numpy (Walt, Colbert Varoquaux 2011 ), scipy (Jones et al. 2001 ), yt (Turk et al. 2011 ).