Left: radial profiles of the total emission centered on the peak of the cluster’s emission. The regions used for the profiles are shown in Fig. 3. Black/filled symbols refer to the SE quadrant (black solid line in Fig. 3), red/open symbols refer to the complementary 270 deg region (red dashed line in Fig. 3). Right: radial profile of HCG 79 centered at (RA = 15^h59^m11.9^s, δ = + 20°45′31.0′′) the center of the optical halo (Da Rocha et al. 2005).