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tokens: It is a pleasure to thank Eve Ostriker for stimulating discussions and insightful suggestions, Anne Decourchelle and Jean Ballet for enlightening elements regarding the observations of supernovae remnants and Matthieu Gounelle for triggering our interest in supernova explosions. We thank the anonymous referee for a careful reading of the manuscript which has significantly improved the paper. This work was granted access to HPC resources of CINES under the allocation x2014047023 made by GENCI (Grand Equipement National de Calcul Intensif). P.H. acknowledges the financial support of the Agence Nationale pour la Recherche through the COSMIS project. This research has received funding from the European Research Council under the European Community’s Seventh Framework Programme (FP7/2007-2013 Grant Agreement No. 306483 and No. 291294).