tokens: ACKNOWLEDGEMENTS The authors would like to thank the anonymous referee for his/her detailed reading of our work and the many suggestions which improved this manuscript considerably. The authors gratefully acknowledge the Gauss Centre for Supercomputing e.V. ( www.gauss-centre.eu ) for funding this project by providing computing time on the GCS Supercomputer SuperMUC at Leibniz Supercomputing Centre ( http://www.lrz.de ) through project pr49zo, and the Leibniz Gemeinschaft for funding this project through grant SAW-2012-AIP-5 129.
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