Fossil group origins - XI. The dependence of galaxy orbits on the magnitude gap S. Zarattini, A. Biviano, J. A. L. Aguerri, M. Girardi and E. D’Onghia A&A, 655 (2021) A103 Published online: 29 November 2021 DOI: 10.1051/0004-6361/202038722