Median colour gradient, ∇_g−x, where x = rizYJH, as a function of r-band absolute magnitude, M_r, in each of our colour/Sérsic index subsamples. Solid and dashed lines show colour gradients over the radius ranges 0.1R_e–1R_e, and 0.1R_e–2R_e, respectively. Lines are limited to magnitude bins containing at least 10 objects. They are therefore only shown where each subsample makes up a significant fraction (≳1%) of the galaxy population. Different colours correspond to different wavebands, with g−r at the top to g−H at the bottom, as indicated. Results of previous studies are overlaid in the panels which most closely match the subsample of that study (see legends). We see that only the red, high-n population has galaxies brighter than M_r ~ −22.5, so these galaxies dominate at the bright end.