tokens: We are grateful to Bernhard Müller for helpful discussions about various neutrino-transport issues, to Lorenz Hüdepohl for providing his vertex-prometheus data used for the test in Section 4.3.1 , to Bruno Peres for useful comments, and to the anonymous referee for helping to improve the clarity of the manuscript. We acknowledge support by the Max-Planck/Princeton Center for Plasma Physics (MPPC), by the Deutsche Forschungsgemeinschaft through the Transregional Collaborative Research Center SFB/TR 7 ‘Gravitational Wave Astronomy’, by the Computational Center for Particle and Astrophysics (C2PAP) as part of the Cluster of Excellence EXC 153 ‘Origin and Structure of the Universe’, by the European Research Council through ERC-AdG no. 341157-COCO2CASA at Garching and grant CAMAP-259276 at Valencia, and by the Spanish Ministerio de Ciencia e Innovación through grant AYA2013-40979-P Astrofísica Relativista Computacional at Valencia. The computations were performed at the Rechenzentrum Garching, the Leibniz-Rechenzentrum, and at the cluster Lluisvives of the University of Valencia.
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