Fig. D.1.
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Iso-velocity contours (separated by 20 km s−1) overlaid on DECaLS, SDSS, or POSS images depending on the group. Contours follow a rainbow colour scheme with high velocities corresponding to redder colours and lower velocities to bluer colours (note that the velocity range varies in each panel, but contours are always separated by 20 km s−1).
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