1. Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ, UK
2. Department of Physics and Astronomy, University of the Western Cape, Bellville 7535, South Africa
3. South African Astronomical Observatories, Observatory, Cape Town 7925, South Africa
4. Surendranath College, 24/2 M. G. ROAD, Kolkata 700009, West Bengal, India
5. Center for Computational Astrophysics, Flatiron Institute, 162 5th Avenue, New York, NY 10010, USA