Fraction of blue galaxies as a function of merger score, shown separately for past-merger scores (left) and future-merger scores (right). Each curve corresponds to a redshift bin defined as [z_low, z_high), i.e., including the lower bound but excluding the upper bound. Within each redshift bin, the score distribution is divided into five quantile bins. Error bars indicate the standard error of the mean blue fraction within each merger score bin. Several redshift bins are absent in the future-merger panel due to the exclusion of low-redshift samples (z < 0.15).