1. Aryabhatta Research Institute of Observational Sciences (ARIES); Manora Peak; Nainital; 263 129; India
2. Max-Planck-Institut für Radioastronomie (MPIfR); Auf dem Hügel 69; D-53121; Bonn; Germany
3. Department of Physics; The College of New Jersey; PO Box 7718; Ewing; NJ; 08628; USA
4. Indian Institute of Astrophysics; Sarjapur Rd, Koramangala; Bangalore; 560 034; India
5. Institute of Astronomy; Bulgarian Academy of Sciences; 72 Tsarigradsko Shosse Blvd.; 1784; Sofia; Bulgaria
6. Astrophysical Institute; Department of Physics and Astronomy; Ohio University Athens; OH; 45701; USA
7. Abastumani Observatory; Mt. Kanobili; 0301; Abastumani; Georgia
8. Korea Astronomy and Space Science Institute (KASI); Daejeon; 305-348; Republic of Korea
9. Xinjiang Astronomical Observatory; the Chinese Academy of Sciences; 150 Science 1-Street; Urumqi; 830011; China
10. UCD School of Physics; University College Dublin; Dublin; Ireland
11. Department of Physics; University La Sapienza; P. le Aldo Moro 2; I-00185; Roma; Italy
12. Nordic Optical Telescope; E-38700 Santa Cruz de La Palma; Santa Cruz de Tenerife; Spain
13. SARA Observatory; Florida International University; Miami; FL; 33199; USA
14. Instituto de Astrofísica de Andalucía; CSIC; Apartado 3004; 18080; Granada; Spain