Fig. A.1.
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Example channel maps of the primary beam corrected cube of HCG 31 overlaid on DECaLS DR10 R-band optical images. Contour levels are (1.5, 2, 2.5, 3, 6, 9, 16, 32) times the median noise level in the cube (0.71 mJy beam−1). The blue colours show contour levels below 3σ; the red colours represent contour levels at 3σ, or higher. More channel maps are available online.
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