Similar to Fig. 9 but for the mean and median of the δ_blue and δ_red distributions for the GCs of different galaxies. The error bars centred in the mean indicate the standard error on the mean of the quantities. The dotted line stands for the value δ_blue and δ_red = 0. NGC 4382 and NGC 4473 are marked with yellow rectangles because their K-band data were obtained in highly extincted conditions.