1. Centre for Space Research, Physics Department, North West University, Mahikeng 2745, South Africa
2. Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK
3. Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, ul. Bartycka 18, PL-00-716 Warszawa, Poland
4. Department of Physics, Kavli Institute for Astrophysics and Space Research, M.I.T., Cambridge, MA 02139, USA
5. Graduate School of Science, Astronomical Institute, Tohoku University, Sendai 980-8578, Japan
6. Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
7. 12812 SE 69th Place, Bellevue, WA 98006, USA
8. 616 W. 53rd. St., Apt. 101, Minneapolis, MN 55419, USA
9. Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain
10. Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
11. Department of Astronomy, The University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USA
12. 7507 52nd Place NE, Marysville, WA 98270, USA
13. Department of Physics and Astronomy, Bishop’s University, 2600 College St., Sherbrooke, QC J1M 1Z7, Canada
14. Physics Department, Faculty of Sciences and Arts, Çanakkale Onsekiz Mart University, 17100 Çanakkale, Turkey
15. INFN, Laboratori Nazionali del Sud, Via S. Sofia 62, I-95123 Catania, Italy