1. Max-Planck-Institut für Astronomie, Heidelberg
2. INAF Osservatorio Astronomico di Padova, Padova
3. INAF OA-Brera, Merate, Lc
4. Université Paris Diderot, LESIA, Observatoire de Paris, CNRS, UPMC, Meudon
5. INAF OAS, Bologna
6. Max Planck Institute for Extraterrestrial Physics, Garching