Ángel Piñeiro

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Edgar Mixcoha

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Rebeca García Fandiño

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Roberto Rosende Dopazo

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Funding

This work was supported by the grant MAT2011-25501 (MINECO, Spain). E.M. is thankful for the support of CONACyT, Mexico, by a postdoctoral fellow (grants 186153 and 203848). We are grateful to the “Centro of Supercomputación de Galicia” (CESGA) for computing time and for their excellent services.