RA−z distribution of secure-redshift galaxies in W1 (top) and W4 (below), in comoving coordinates. For the sake of clarity, only the central degree in Dec is plotted. The colour used for each galaxy refers to the value of the local density computed around the galaxy (from light grey for the lowest density to black for the highest density, as in the colour bar). The density is computed in cylindrical filters with radius corresponding to the fifth n.n., using the volume-limited sample of tracers that is complete up to z = 0.9.