Cl0016+1609. Left panel: image of the BCG. The BCG is indicated with a red cross, the small galaxy to the north-east belongs to the cluster, but not the large galaxy located south-west of the BCG. Right panel: large scale density map computed from the galaxies located on the cluster red sequence. The black circle is centred on the position of the cluster given in Table 1 and has a 1 Mpc radius, as in all following figures (in some cases, the circle is drawn in another colour to be more visible). In both figures, the contour levels start at 3σ, they increase by 2σ or 3σ in the left figures, depending on the brightness of the BCG, and by 1σ in the density maps. In the right figure, the ellipse (here in cyan, but drawn with different colours for other clusters to be clearly visible) indicates the maximum extent of the 3σ contours. The small green or white points show the positions of the galaxies with a measured spectroscopic redshift. The magenta points show the galaxies with redshifts in the approximate cluster redshift range (this range is indicated in the figure caption of each cluster, it is 0.53 < z < 0.57 for Cl0016+1609), and the small blue rectangle at the centre shows the size of the left figure (in this and following figures). North is up and east is left in all figures.
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