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tokens: Acknowledgements The authors thank Jaime de la Cruz Rodríguez for his helpful comments on an early version of the manuscript. Financial support from the Spanish Ministry of Economy and Competitivity through projects AYA2014-55078-P, AYA2014-60476-P and AYA2014-60833-P is gratefully acknowledged. The authors wish to acknowledge the contribution of Teide High-Performance Computing facilities to the results of this research. TeideHPC facilities are provided by the Instituto Tecnológico y de Energías Renovables (ITER, SA). URL: http://teidehpc.iter.es . This work was also supported by computational resources provided by the Australian Governmentthrough the Pawsey Supercomputing Centre under the National Computational Merit Allocation Scheme.