1. CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei, Anhui 230026, China.
2. School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China.
3. Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843-4242, USA.
4. Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA.
5. Department of Physics, Middlebury College, Middlebury, VT 05753, USA.
6. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA.
7. Department of Physics, University of California, Santa Barbara, Santa Barbara, CA 93106, USA.
8. Department of Astronomy, School of Physics and Technology, Wuhan University, Wuhan 430072, China.
9. Zentrum für Astronomie der Universität Heidelberg, Astronomisches Rechen-Institut, Mönchhofstr 12-14, D-69120 Heidelberg, Germany.
10. Department of Physics, Rhodes College, Memphis, TN 38112, USA.