Colour (g-r) and redshift distribution of the data used in the stacks from Figs. 17-24. The stacks considered four redshift bins separated by vertical lines, with triangles at z < 0.5, circles at 0.5 ≤ z < 1.0, squares at 1.0 ≤ z < 2.0, and diamonds at z ≥ 2.0. Each redshift bin was divided into three colour ranges with approximately the same number of sources per colour bin, shown as blue, green, and red.