The top panel presents the 25 cm total intensity map of the filaments of A2255. The arrow passing through each filament represents the direction along which the profile of the polarized emission though the RM cube was extracted. These three profiles are reported in panels F1, F2, and F3, together with a couple of examples of Faraday spectra extracted at the locations specified in the total intensity map (A, B, C, D, E, and F). The dotted line is at φ = 0 rad m^-2. The total intensity map has a resolution of 14″ ×  15″ and the contours are at 0.05, 0.1, 0.2, 0.4, 0.8, 1.6, 3.2, 6.4, 12, 24 mJy beam^-1.