Fig. D.1.
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Characterisation of the environments of the galaxies. Upper panel: FCC 224 (shown with the orange star marker). Lower panel: DF2/DF4 (green and purple stars, respectively). These are based on the 2MASS XSC, revealing that the galaxies are in low-density regions: FCC 224 in the outskirts of the Fornax Cluster and DF2/DF4 in the sparsely populated NGC 1052 group, distant from massive galaxies.
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