Fig. 5
Distribution of g − r colours (AB mag) of HUDs (green outline). The dwarf (M* < 109 M⊙) centrals from the parent population of the Santa Cruz SAM are shown with the dashed red outline, the central UDGs with the dotted purple outline, and the HI-rich central UDGs with the solid blue outline. The field UDGs discussed in Rong et al. (2017) are also shown as the grey filled bars.
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