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tokens: ACKNOWLEDGEMENTS We appreciate the ATNF and CSIRO Data Access Portal for making such high-quality data publicly available. We thank the XMM–Newton help desk for important clarifications regarding the XMM–Newton data analysis. We also thank Bettina Posselt, Oleg Kargaltsev, George G. Pavlov, and Joanna Rankin for the useful discussions. We greatly appreciate Dr. Sebastien Guillot for carefully reviewing our manuscript and suggesting essential improvements. DM acknowledges funding from the grant ‘Indo-French Centre for the Promotion of Advanced Research – CEFIPRA’.