Fig. 9
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Sky distribution of red UDG samples (red dots) and blue UDG samples (blue dots) identified in this study (2991 in total). The green circle marks the location of the Abell 194 galaxy cluster (RA=21.4200°, Dec=−1.4072°), and the black circle marks the location of the RXC J0340.1-1835 galaxy cluster (RA =55.0475°, Dec =−18.5875°). The green box highlights the region where red UDG samples show a significant clustering feature, with Dec values between −24° and −16°.
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