Galaxy colour-magnitude diagram for GAMA galaxies. The logarithm of the specific star formation rate for each galaxy is displayed according to the upper colour bar. The dashed black line in the main panel indicates the empirical law for separating red and blue galaxies (see Section 2). The right marginal plot shows the colour distributions for galaxies classified as red (above the dashed line) and blue (below the dashed line) galaxies. The upper distributions show the specific star formation rate for galaxies classified as red and blue following the empirical law. The vertical dotted line indicates the specific star formation limit (−10.7) we adopted to split the galaxy sample into quenched (to the left) and star-forming galaxies (to the right).