Top: images of 3C 40A and 3C 40B at different frequencies, smoothed to a resolution of 2.9′. The images are VLSSr (74 MHz; Lane et al. 2014), VLA P band (330 MHz), VLA L band (1443 and 1630 MHz), and SRT (6600 MHz). The dynamic range (DR) of each image is shown on each of the top panels. Bottom: total spectrum of sources 3C 40 A and 3C 40 B together. The blue line is the best fit of the CI model.
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