Fig. 12.
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Spectral index profile along the ‘ridge’ of diffuse emission in HCG15. The top panel shows the radio surface brightness at 943 MHz as per Fig. 8, with circular regions of 20 arcsec diameter denoting those profiled. The bottom panel shows the spectral index trend in the indicated regions. Horizontal lines show the median values for each of the αlow, αmid, and αhigh profiles.
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