Repositorio Institucional de la Universidad de Oviedo

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his study was supported in part by the US Department of Energy through grant DE-FG02-98ER14890. Support from University of Oviedo CEI grants “Ayudas económicas para la movilidad de excelencia para docentes e investigadores de la Universidad de Oviedo” for a stay by Jaime Orejas at Indiana University and the stay by Steven J. Ray at the University of Oviedo are gratefully acknowledged. Jaime Orejas also acknowledges the Spanish Ministry of Education for the FPU grant he is enjoying (FPU2009-1372). The authors are also grateful to the LECO corporation for the generous donation of equipment.