1. Università degli Studi di Palermo, via Archirafi 36, I-90123 Palermo, Italy
2. INAF – IASF Palermo, Via U. La Malfa 153, I-90146 Palermo, Italy
3. IAAT Universität Tübingen, Sand 1, D-72076 Tübingen, Germany
4. INAF – Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, I-80131 Napoli, Italy
5. IRAP, Universitè de Toulouse, CNRS, UPS, CNES, Toulouse, France