tokens: Acknowledgments This work has been supported by Narodowe Centrum Nauki through research projects DEC-2011/01/B/ST9/03183 (JN) and DEC-2013/10/E/ST9/00662 (OK, JN and AB). MP acknowledges support through grant PO 1508/1-2 of the Deutsche Forschungsgemeinschaft. The numerical experiment was possible through a 7 Mcore-hour allocation on the 2.399 PFlop Prometheus system at ACC Cyfronet AGH. Part of the numerical work was conducted on resources provided by the North-German Supercomputing Alliance (HLRN) under project bbp00003 and also at the Pleiades facility at the NASA Advanced Supercomputing (NAS).
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