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tokens: ACKNOWLEDGEMENTS We used the nirvana code version 3.3, developed by Udo Ziegler at the Leibniz-Institut für Astrophysik Potsdam (AIP). For computations we used Leibniz Computer Cluster, also at AIP. We thank Dipankar Bhattacharya, Torsten Enßlin and Anvar Shukurov for very insightful discussions.