HST composite optical (left) and Chandra (right) images overlaid with the LOFAR 144 MHz contours (blue in the right panel). The resolutions of the LOFAR contours shown in the bottom left corner are 14″ × 11″ (PA = 55°, left) and 15″ × 15″ (right). In the right panel, the compact radio sources indicated with cyan circles are subtracted in the uv data. The magenta dashed lines show the shock locations. In both images, the LOFAR contours start from ±2.5σ (dotted negative), where σ = 135 and 160 μJy beam⁻¹ in the left and right panels, respectively. The Chandra first contour is 2  ×  10⁻⁹ cts cm⁻² s⁻¹ arcsec⁻². The next contours are spaced by a factor of .