Repositorio Institucional de la Universidad de Oviedo

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he authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The data reported in this article was collected with the support of the U.S. National Science Foundation (awards: SRS85-17581, SRS88-07409, SRS90-02467, SRS92-17876, SRS99-06416); the Foundation BBVA (Spain); the U.S. National Aeronautics and Space Administration (coopoerative agreement: NNX16AC66A). We are grateful for this support, but all of the findings and conclusions reported in this work are the responsibility of the authors and do not necessarily reflect the views of any funding agency.