1. P. N. Lebedev Physical Institute, RAS, Leninsky Prospekt 53, Moscow, RU-119991, Russia
2. INFN, Structure of Rome II and Physics Department of University of Rome "Tor Vergata", Via della Ricerca Scientica 1, Rome, I-00133, Italy
3. Moscow Engineering and Physics Institute, Kashirskoe Shosse 31, Moscow, RU-115409, Russia
4. INFN, Structure of Florence and Physics Department of University of Florence, Viale Sansone 1, Sesto Fiorentino, Florence, I-50019, Italy
5. Istituto di Fisica Applicata "Nello Carrara", Via Panciatichi 64, Florence, I-50127, Italy
6. INFN, Structure of Trieste and Physics Department of University of Trieste, Via A. Valerio 2, Trieste, I-34147, Italy
7. Royal Institute of Technology (KTH), Albanova University Centre, Stockholm, SE-10691, Sweden
8. INFN, Structure of Naples and Physics Department of University of Naples "Federico II", Via Cintia, Naples, I-80126, Italy
9. Universitat Siegen, Siegen, D-57068, Germany
10. INFN, Laboratori Nazionali di Frascati, Via Enrico Fermi 40, Frascati, I-00044, Italy
11. INFN, Structure of Bari and Physics Department of University of Bari, Via Amendola 173, Bari, I-70126, Italy
12. A. F. Ioffe Physical-Technical Institute, Polytekhnicheskaya 26, St. Petersburg, RU-194021, Russia
13. P. N. Lebedev Physical Institute, Leninsky Prospekt 53, Moscow, RU-119991, Russia
14. NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
15. New Mexico State University, Las Cruces, NM 88003-8001, USA