Fig. 4.
Number density of the u-selected blue (u − g < 0.4 mag) regions around the galaxy NGVS 3543 (marked as the green ellipse). The white circle marks the position of the VLA HI detection of AGC 226178 from Cannon et al. (2015), with a beam size of 49″. The white dashed box indicates the region above 3σ level of the mean background number density. The red dashed box (190″ × 120″) shows the area where the properties of the blue regions are analyzed in this work.
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