tokens: We would like to thank Ruud Visser for providing a detailed and clear referee’s report that helped to improve the paper. We also want to thank Zhaohuan Zhu for providing the burst spectrum of FU Orionis. CH.R. and E.V. acknowledge funding by the Austrian Science Fund (FWF): project number I2549-N27. CH.R. and M.G. acknowledge funding by the Austrian Science Fund (FWF): project number P24790. M.A. and A.P. acknowledge funding by the Swiss National Science Foundation (SNSF): project number: 200021L_163172. The research leading to these results has received funding from the European Union Seventh Framework Programme FP7-2011 under grant agreement No. 284405. This publication was partly supported from the FFG ASAP 12 project JetPro* (FFG-854025). This publication was supported by the Austrian Science Fund (FWF). The computational results presented have been achieved using the Vienna Scientific Cluster (VSC). This research has made use of NASA’s Astrophysics Data System. All figures were made with the free Python module Matplotlib ( Hunter 2007 ). This research made use of Astropy, a community-developed core Python package for Astronomy ( Astropy Collaboration et al. 2013 ).
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