Fig. A.1.
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Top: Spectral index map of the radio halo and the corresponding error map. The overlaid black and magenta contours are from the MeerKAT UHF band and L band’s HR images, respectively. For both images, the contour levels are σ×[3,9,18,27]. 1σ is 12.4 μJy/beam for the UHF-band image and 4.9 μJy/beam for the L-band image. Bottom: Corresponding error map.
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