Surface brightness profiles across the NW direction in a semicircle (from −57° to +123° from W and increasing counterclockwise, left panel) and in a narrower 80°-wide sector (from 0° to 80° from W and increasing counterclockwise, right panel). In each panel, the best-fit broken power-law model is overlaid in blue, while the residuals are shown in the lower boxes and the individual components of the SB associated with the broken power law inside (“In”) and outside (“Out”) the front are shown with dashed orange and green lines, respectively. As is discussed in the text, we interpret the inner edge (left panel, R_inner = 0.94′±0.02′∼295 ± 6 kpc) as a cold front and the outer edge (right panel, R_outer = 1.24′±0.02′∼389 ± 6 kpc) as a shock front. The radial distances are in units of arcmin, where 1 arcmin = 313.8 kpc.