Affiliation: | Department of Physics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece;Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 15783, Greece;Departamento de Astronomía y Astrofísica, Universidad de Valencia, Dr. Moliner 50, 46100 Burjassot (Valencia), Spain |