1. Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences , ul. Bartycka 18, PL-00-716 Warsaw, Poland
2. Helmholtz-Instituts für Strahlen- und Kernphysik (HISKP) , Nussallee 14-16, D-53115 Bonn, Germany
3. Argelander-Institut für Astronomie (AIfA) , Auf demügel 71, D-53121, Bonn, Germany
4. Department of Astronomy, Indiana University , Swain West, 727 E. 3rd Street, Bloomington, IN 47405, USA
5. Department of Astronomy, Yonsei University 50 Yonsei-Ro , Seodaemun-Gu, Seoul 03722, Republic of Korea
6. Korea Astronomy and Space Science Institute , Daejeon 34055, Republic of Korea
7. Leiden Observatory, Leiden University , PO Box 9513, NL-2300 RA, Leiden, The Netherlands