Left panel: galaxy rest-frame colour–magnitude diagram, where we choose a cut in g − r to isolate the red sequence in GAMA and SDSS. Right panel: sample absolute r-band magnitude-redshift diagram. The total distribution of GAMA and SDSS galaxies is shown, binned in hexagonal cells with a colour scale corresponding to the counts in cells. Coloured contours indicate 75% and 95% of galaxies in a sample. Colour/redshift cuts are shown as dashed green lines, and the apparent leakage of contours is due to the grid-size used in kernel density estimation.