The radio relic in Abell 2256: overall spectrum and implications for electron acceleration M. Trasatti, H. Akamatsu, L. Lovisari, U. Klein, A. Bonafede, M. Brüggen, D. Dallacasa and T. Clarke A&A, 575 (2015) A45 Published online: 19 February 2015 DOI: 10.1051/0004-6361/201423972