1. Department of Astronomy, University of Cape Town , Private Bag X3, Rondebosch 7701 , South Africa
2. Research Center for Intelligent Computing Platforms, Zhejiang Laboratory , Hangzhou 311100 , China
3. International Centre for Radio Astronomy Research (ICRAR), The University of Western Australia , 35 Stirling Highway, Crawley, WA 6009 , Australia
4. UK Astronomy Technology Centre, Royal Observatory Edinburgh , Blackford Hill, Edinburgh EH9 3HJ , UK
5. South African Radio Astronomy Observatory , 2 Fir Street, Observatory 7925 , South Africa
6. The Inter-University Institute for Data Intensive Astronomy (IDIA), and University of Cape Town , Private Bag X3, Rondebosch 7701 , South Africa
7. INAF – Osservatorio Astronomico di Cagliari , Via della Scienza 5, I-09047 Selargius, CA , Italy