1. Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
2. Department of Physics, Engineering Physics, and Astronomy, Queen’s University, Kingston, ON K7L 3N6, Canada
3. Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China
4. Observatoire d’Astrophysique de l’Universite de Ouagadougou (ODAUO), BP 7021, Ouagadougou 03, Burkina Faso