Mushroom-head-shaped X-ray cavity in A496. (a) Chandra unsharp masked image of A496, obtained by subtracting a 10″σ smoothed image from a 2″σ smoothed one. The image has been further smoothed with a 4″σ Gaussian. (b) Same as panel (a), with red contours from the GMRT at 330 MHz at levels of 1.5, 3, 6, and 12 mJy/beam. Green contours are from the VLITE at 340 MHz at levels of 2, 4, 8, 16, 32, 64, and 128 mJy/beam. The dashed white region shows the mushroom-head-shaped cavity.