1. Argelander-Institut für Astronomie, Auf dem Hügel 71, D-53121 Bonn, Germany
2. South-Western Institute for Astronomy Research, Yunnan University, Kunming 650500, China
3. Department of Astronomy, School of Physics, Peking University, Beijing 100871, China
4. Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
5. Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands
6. Faculty of Physics, Ludwig-Maximilians-Universität, Scheinerstr. 1, D-81679 Munich, Germany
7. Excellence Cluster Universe, Boltzmannstr. 2, D-85748 Garching, Germany
8. INAF – Astronomical Observatory of Capodimonte, Via Moiariello 16, I-80131 Napoli, Italy
9. Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands
10. Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK
11. INAF, Osservatorio Astronomico di Bologna, via Pietro Gobetti 93/3, I-40129 Bologna, Italy
12. INAF – Osservatorio Astronomico di Padova, via dell'Osservatorio 5, I-35122 Padova, Italy
13. Key laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China