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Fig. 3

image

Density map of the galaxies selected as belonging to the cluster Cl 0016+1609 (z = 0.5455). The large black circle (in some of the following figures it may be drawn in other colours to be more clearly visible) is centred on the position of the cluster given in Table 1 and has a radius of 1 Mpc, as in all following figures. The green contour levels start at 3σ and increase by 1σ. The cyan ellipse (often drawn in yellow in other figures) indicates the maximum extent of the 3σ contours, with the values of the ellipse major and minor axes given in Table 2. The dark blue ellipse indicates the maximum extent if the neighbouring cluster A is excluded. The small white points show the positions of the galaxies with a measured spectroscopic redshift, and the magenta points those that are in the approximate cluster redshift range (given in the figure captions, here 0.53 <z< 0.57). The medium-size circles (here black, but also blue or white in some of the following figures) indicate clusters that we detect and that can be identified with a galaxy cluster or group in NED. North is up and east is left in all figures.

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