Observational tests of asymptotically flat spacetimes Tao Zhu, Hoang Ky Nguyen, Mustapha Azreg-Aïnou and Mubasher Jamil Eur. Phys. J. C, 84 3 (2024) 330 Published online: 29 March 2024 DOI: 10.1140/epjc/s10052-024-12610-2