Top-left: absolute rest-frame colour u − i vs. i magnitude for PAUS galaxies in the W3 area. These rest-frame magnitudes were derived for CFHTLenS (Erben et al. 2013) using the LEPHARE software package (Arnouts et al. 1999; Ilbert et al. 2006). We define the red sequence as those galaxies for whom u − i > 1.138 − 0.038i, as indicated by the orange line. Top-middle: spectroscopic redshift distribution of galaxies in GAMA, and photo-z distribution of PAUS W3, coloured according to the cuts in the top-left and top-right panels – we note that PAUS samples are restricted to 0.1 < z_phot. < 0.8 for our correlation function analysis. Top-right: absolute rest-frame colour u − i vs. i magnitude for GAMA equatorial galaxies from the final GAMA data-set (Liske et al. 2015). We followed Johnston et al. (2019) in setting the red/blue boundary at rest-frame g − r = 0.66, and plot the galaxies on the u − i vs. i plane for comparison with PAUS W3. Bottom: CIGALE-estimated absolute rest-frame u − i vs. i for PAUS W3, with 2-cluster (left) and 3-cluster (right) galaxy type classification.