Radial profiles of halo surface brightness at 0.43 (green solid curve) and 0.6 μm (red dash‐dotted curve) generated from the ﹩\mathrm{F}\,435\mathrm{W}\,﹩ and ﹩\mathrm{F}\,606\mathrm{W}\,﹩ images. The surface brightness has been averaged over large angular ranges, which avoid the nebular lobes (48° in the northeast and southwest quadrants) in order to increase the S/N in the very faint outer regions of the halo. A radial power law, with exponent −4.1, is shown for comparison.