GMRT images of the cluster Z2120. Left: DSS optical image with GMRT high-resolution contours overlaid. Contours start at 0.1 mJy beam⁻¹ and are spaced by a factor of two. The first negative contour is dashed. Labels mark the position of discrete sources. Right: GMRT 330 MHz low-resolution (32.7″ × 28″) contours after the subtraction of compact sources superimposed on the Chandra X-ray image. Contours are (2,3,6...) × σ, with σ = 0.3 mJy beam⁻¹. The position of the discrete sources is marked with a black cross.