Galaxies identified as either star-forming or quiescent based on their NUV − r and r − J rest-frame colours at z ≤ 3. Rest-frame colours are measured using LePHARE following Ilbert et al. (2005). Representative uncertainties associated with the rest-frame colours of the star-forming (blue) and quiescent (maroon) subsamples are plotted. At z > 1.5, the Balmer break is redshifted between two observed bands (HSC z and IRAC [3.6 μm]), and so the inferred rest-frame colours become increasingly model-dependent. Shading corresponds to logarithmic density.