1. Institute of Astrophysics, Foundation for Research and Technology-Hellas, Voutes, 71110 Heraklion, Greece
2. Department of Physics, University of Crete, 71003 Heraklion, Greece
3. Astronomical Institute, St. Petersburg State University, Universitetsky pr. 28, Petrodvoretz, 198504 St Petersburg, Russia
4. Cahill Center for Astronomy and Astrophysics, California Institute of Technology, 1200 E California Blvd, MC 350-17, Pasadena CA, 91125, USA
5. Section of Astrophysics, Astronomy & Mechanics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis Zografos 15784, Greece
6. Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
7. Finnish Centre for Astronomy with ESO, FINCA, University of Turku, Quantum, Vesilinnantie 5, FI-20014, Finland
8. Aalto University Metsähovi Radio Observatory, Metsähovintie 114, FI-02540 Kylmälä, Finland
9. Geodesy and Geomatics Engineering Laboratory, Technical University of Crete, GR-73100 Chania, Greece
10. Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziadzka 5, PL-87-100 Toruń, Poland
11. Center for Interdisciplinary Exploration & Research in Astrophysics (CIERA), Northwestern University, Evanston, IL 602, USA
12. Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411 007, India
13. Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, Voutes, 71110 Heraklion, Greece
14. Janusz Gil Institute of Astronomy, University of Zielona Góra, Prof. Szafrana 2, PL-65-516 Zielona Góra, Poland