Density maps obtained for different heights of the red sequence V − I = −0.0436 × I + b (see Sect. 2.2). From top to bottom: b = 2.50, 2.75, 3.00, and 3.25. Galaxies within ±0.3 mag from the red sequence are selected. The dynamic range is the same in all the figures, but the contour levels are estimated for each image as described in Sect. 2.2.
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