Distributions of (FUV–NUV) colour (where available) for the various samples, plotted with the same colours as before. (Note that the vertical scale has been truncated to allow the details of the three red sequence selections to be made clearer). Star-forming galaxies (grey histogram) can be seen to be concentrated at (FUV–NUV) <1.1, as are the galaxies removed by our NUV and WISE colour cuts, while our NUV + WISE passive galaxies span the range ∼0.7 to 2.1. Colour errors here are up to 0.3 mag.