Rest-frame U−B colour distribution in a mass-limited sample (using the most conservative limit, see text) in different redshift bins, as observed (solid black histogram for the total population) and predicted using the “SFH-evolution” from the previous higher redshift bin (red filled histogram). The dotted blue histogram in the top panels represent the expected z = 0 colour distribution by applying the “SFH-evolution” to the galaxies in the first redshift bin. Left panels: assuming no evolution in the dust content, i.e., the same dust content derived from the SED fitting at the observed redshift; right panels: assuming no dust content in the evolved galaxies.