Offsets between different populations of galaxies and the reference galaxy locus (galaxies with 24.2 < V₆₀₆ < 27.0, where galaxies at the cluster redshifts 1.2 ≲ z ≲ 1.7 are excluded according to a cut in the VIJ colour plane; represented by black squares). Overall the populations exhibit quite similar offsets in U − V₆₀₆ colour despite relying on different U bands. Top section: comparison of directly matched galaxies in the HUDF region based on our measurements and the catalogue in GOODS-South by Skelton et al. (2014). Mid section: comparison of cluster fields (measurements from all nine cluster fields combined) and our measurements in the HUDF area, where we have U_HIGH imaging. Since we do not have photometric redshifts available, the populations relying on these are missing (purple pentagons and cyan triangles). Bottom section: comparisons for five CANDELS/3D-HST fields.