Alexia Tsouni, Stavroula Sigourou, Vasiliki Pagana, Michail-Christos Tsoutsos, National Observatory of Athens (NOA), Greece; Panayiotis Dimitriadis, G-Fivos Sargentis, Theano Iliopoulou, Romanos Ioannidis, Dimitra Dimitrakopoulou, Efthymios Chardavellas, Marcos Julien Alexopoulos, Antonis Koukouvinos, Nikos Mamasis, Demetris Koutsoyiannis, National Technical University of Athens (NTUA), Greece; Charalampos (Haris) Kontoes, National Observatory of Athens (NOA), Greece