Distribution of colour [g − i] (rest-frame) vs. r-band absolute magnitude for the FLS. The colour coding of the points (from red to blue) represents increasing galaxy number density. The black dashed line is the criterion of [g − i]_rest = 0.9 to separate red and blue galaxies. There are two sequences of galaxies in [g − i]_rest > 0.9 and [g − i]_rest < 0.9 that are considered as the galaxies of Red Lens and Blue Lens, respectively.