Top: total intensity radio contours of the A781 system at 1400 MHz with the VLA in D configuration. The image has a FWHM of 41.6′′  ×  44.8′′ (PA = 16.6°). The contour levels are drawn at  − 0.3 (thin-dashed lines), 0.3 mJy beam^-1, and the rest are spaced by a factor of 2. The sensitivity (1-σ) is 0.1 mJy beam^-1. Total intensity radio contours are overlaid on the XMM X-ray image in the 0.2 − 12 keV band. The X-ray image was convolved with a Gaussian of σ = 8′′. Middle: total intensity radio contours at 1400 MHz with the VLA in C configuration. The image has a FWHM of 13.2′′  ×  16.5′′ (PA =  −84.9°). The first contour level is drawn at 0.27 mJy beam^-1 and the rest are spaced by a factor of 2. The sensitivity (1-σ) is 0.09 mJy beam^-1. Bottom: total intensity radio contours of the discrete sources A, B, C, and D at 1400 MHz with the VLA in A configuration. The images have a FWHM of 1.2′′  ×  1.4′′ (PA = 67.3°). The sensitivity (1-σ) is 0.05 mJy beam^-1. The first contour level is drawn at 0.15 mJy beam^-1 and the rest are spaced by a factor of . The field of view of the images is 30′′.