1. Department of Mathematics and Physics ‘E. De Giorgi’, University of Salento, Via per Arnesano, CP-I93, I-73100 Lecce, Italy
2. INFN, Sezione di Lecce, Via per Arnesano, CP-193, I-73100 Lecce, Italy
3. Euclid Science Operation Centre, European Space Astronomy Centre, European Space Agency, P.O. Box 78, E-28691 Villanueva de la Canada, Madrid, Spain
4. R. P. Feynman Observatory, Gagliano del Capo, I-73034 Lecce, Italy
5. CBA, Center for Backyard Astrophysics, Gagliano del Capo, I-73034 Lecce, Italy