(a) ACIS image in the 0.7–5 keV band. Pixels are 2^{﹩\arcsec﹩}; point sources are excluded. A mild brightness edge is seen 60 h⁻¹ kpc south of the center. (b) Same image smoothed by a Gaussian with ﹩\sigma =1^{\prime \prime }﹩ (brightness increases from gray to red to green). The cool filament (Fabian et al. 2001) is seen in the center. The dashed ellipse centered on the cD galaxy approximately delineates the edge. The dashed lines show two 60° sectors used for extracting radial profiles.