Examples of Σ₅ maps in redshift slices of the full passive galaxy sample in the 2 sq. deg COSMOS field (North is up, East is left). Maps are scaled so that red colors correspond to > 5σ significance. The three candidate overdensities described in Sect. 3.1 are highlighted with white circles (2 Mpc radius proper). In each plot, the inset shows the distribution of log(Σ₅) values in the map and its Gaussian fit (white and orange lines, respectively), and the white arrow shows the peak Σ₅ value of the highlighted overdensity.