Fig. 6
Color–color diagram (g−r colors versus u−g colors) for the 10 new X-shaped sources analyzed here (empty triangles), the X-shaped sources from M11 (filled triangles), and the control sources from M11 (squares). Black line: u−r = 2.22 galaxy type separator from Strateva et al. (2001). Sources situated above this line are classified as early-type galaxies.
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