Dark matter fraction derived from the M31 rotation curve F. Hammer, Y. B. Yang, P. Amram, L. Chemin, G. A. Mamon, J. L. Wang, I. Akib, Y. J. Jiao and H. F. Wang A&A, 694 (2025) A16 Published online: 03 February 2025 DOI: 10.1051/0004-6361/202452753