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Fig. 3
Left: WHT V, R, I color image of Abell 1612. Overlaid are the radio contours from Fig. 2 (left panel). Right: A1612 radio relic spectrum. Flux measurements at 241, 325, and 610 MHz are from the GMRT observations. The 1.4 GHz flux is from the NVSS survey image.
This figure is made of several images, please see below:
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