1. Department of Applied Physics, University of Barcelona, 08028 Barcelona, Spain
2. Meteorological Service of Catalonia, 08017 Barcelona, Spain
3. Dipartimento di Geoscienze, Università degli Studi di Padova, 35122 Padova, Italy
4. National Research Council of Italy, Institute of Atmospheric Sciences and Climate (CNR-ISAC), 00133 Rome, Italy
5. German Aerospace Center (DLR), 38108 Braunschweig, Germany
6. Austro Control, 1030 Vienna, Austria
7. CIMA Research Foundation, 17100 Savona, Italy
8. Geomatics Research & Development srl (GReD), 22074 Lomazzo, Italy