Fig. 1. Westerbork Synthesis Radio Telescope map at 327 MHz of the Coma cluster from Giovannini et al. (1991). The central halo source Coma C and the cluster relic 1253+275 are identified. Capital letters indicate some extended Coma cluster galaxies, as following: A = NGC 4839, B = NGC 4827, C = NGC 4789. 10' corresponds to 400 kpc .