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Fig. A.4.

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Screenshots of the three-dimensional visualisation of HCG 31. The top panel shows iso-surface level highlighting the high-column density gas. The bottom panel showcases the low-column density H I gas. The blue circles indicate the position of the member galaxies. The 2D greyscale image is a DeCaLS R-band optical image of the group. Interactive visualisations of the group can be accessed online and at https://amiga.iaa.csic.es/x3d-menu/.

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