tokens: ACKNOWLEDGEMENTS DT acknowledges financial post-doctoral support from The Claude Leon Foundation (South Africa). YZM would like to acknowledge the supports from National Research Foundation with grant no. 105925 and 110984, and from the National Science Foundation of China, no. 11828301. The Parkes radio telescope is part of the Australia Telescope National Facility which is funded by the Australian Government for operation as a National Facility managed by CSIRO (Commonwealth Scientific and Industrial Research Organisation). The authors would like to thank Dr. Christopher Anderson for granting access to the processed Parkes 21-cm maps, and for several valuable suggestions about the analysis presented in this work.
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