Same image as in Fig. 3 after division by the best-fitting radial profile shown in Fig. C.1, specifically, (I_X/I_model−1), where the model is the sum of the best-fitting β-model and a constant sky background. In addition to the rich substructure in the core, this image shows clear signatures of an ongoing merger, including elongation in the east-west direction and sloshing. Two boxes show the positions of two prominent radio galaxies, IC310 (black) and NGC 1265 (cyan), respectively. (See also Fig. 6 for a smoothed version of the image that emphasizes large-scale structures.)