Diffusion of cosmic-ray electrons in M 51 observed with LOFAR at 54 MHz V. Heesen, F. de Gasperin, S. Schulz, A. Basu, R. Beck, M. Brüggen, R.-J. Dettmar, M. Stein, L. Gajović, F. S. Tabatabaei and P. Reichherzer A&A, 672 (2023) A21 Published online: 23 March 2023 DOI: 10.1051/0004-6361/202245223