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\acknowledgements  Using \tt{yt} \citep{http://adsabs.harvard.edu/abs/2011ApJS..192....9T} made analysing the simulated data a great deal more efficient and painless than it otherwise would have been. NM sincerely thanks the development team for their rapid resolution of problems and bugs. In parts of this work we made use of Astropy, a community-developed core Python package for Astronomy \citep{http://adsabs.harvard.edu/abs/2013A%26A...558A..33A}