Residuals of Chandra X-ray image (McDonald et al. 2015) minus a β-model. The residuals were smoothed by a boxcar function with a scale of three pixels (1.5 arcsec). The white contours indicate the emission in the X band as observed with the VLA and are drawn at [ − 1, 1, 4, 16] × 4σ_rms, where σ_rms = 2.2 μJy beam⁻¹. The black contours indicate the emission in the L band as observed with the VLA, and are drawn at [ − 1, 1, 2, 4] × 4σ_rms, where σ_rms = 10.8 μJy beam⁻¹. The black pluses indicate the positions of the ghost cavities detected by McDonald et al. (2015).