1. Consiglio Nazionale delle Ricerche, Istituto di Metodologie per l'Analisi Ambientale (CNR-IMAA), C.da S. Loja, Potenza 85050 Tito Scalo, Italy
2. Science Systems and ApplicationS Inc., c/o NASA Langley Research Center MS 475, Hampton, VA 23681, USA
3. Leibniz Institute for Tropospheric Research (IfT), Permoserstraße 15, 04318 Leipzig, Germany
4. Gwangju Institute of Science and Technology (GIST), 1 Cheomdan-Gwagiro, Buk-Gu, Gwangju 500-712, Republic of Korea
5. NASA Langley Research Center, MS 475, Hampton, VA 23681, USA
6. Laser Remote Sensing laboratory, Physics Department, National Technical University of Athens, 15780 Athens, Greece
7. National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan