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tokens: ACKNOWLEDGEMENTS We thank Åke Nordlund for his contributions to the development of the zoom-technique and the modified ramses version used at the Centre for Star and Planet Formation in Copenhagen, and for valuable suggestions and comments to the article. We thank the developers of the python-based analysing tool yt http://yt-project.org/ (Turk et al. 2011 ). Their efforts in providing analysis support for ramses simplified and improved our analysis significantly. We are grateful to the anonymous referee for constructive feedback that helped to improve the manuscript. This research was supported by a Sapere Aude Starting Grant from the Danish Council for Independent Research to TH. Research at Centre for Star and Planet Formation is funded by the Danish National Research Foundation (DNRF97). We acknowledge PRACE for awarding us access to the computing resource CURIE based in France at CEA for carrying out part of the simulations. Archival storage and computing nodes at the University of Copenhagen HPC centre, funded with a research grant (VKR023406) from Villum Fonden, were used for carrying out part of the simulations and the post-processing.