Top: Map of Tail C in Abell 2256 at 6.8″resolution at 149 MHz, (LOFAR reference), color-coded by its spectral index to 1.5 GHz (Owen et al. 2014). Bottom: Observed spectral index between 149 and 1515 MHz, and the corresponding maximum age for relativistic electrons at each location, based on the cutoff frequency calculated from the spectral index, as described in the text. The red line corresponds to an electron transport velocity of 4500 km s⁻¹.