1. International Centre for Radio Astronomy Research (ICRAR), University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia
2. ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Sydney, NSW 2006, Australia
3. ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)
4. National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100101, China
5. CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences