Radio contours at 325 MHz overlaid on the spectral index image (left panels) and on the spectral index error image (right panels) of A520 between 325 and 1400 MHz with a resolution of 60′′ × 60′′ (top panels) and 39′′ × 39′′ (bottom panels). We blanked pixels with brightness below 3σ at 325 or 1400 MHz. The crosses in the low-resolution image represent the radio galaxies embedded in the diffuse emission.
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