3D plot of our approach for selecting candidate CGs. The members of a generic CG are displayed with magenta spheres and the surrounding Cepheids with gray spheres. The dark gray inner area shows the sphere including the members of the CG (the radius RCG). The light gray outer area shows the spherical layer with a volume three times larger than the volume of the selected CG. Candidate CGs have a Cepheid density that is 3.5 larger than the average stellar density of its neighborhood.
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