Distributions of SFR_NORM for our three samples (as indicated in the legend) and also for the total population (black histogram). The mean and median values of the latter are log(SFR_NORM) = 0.17 and log(SFR_NORM) = 0.20, respectively. The units are given in logarithmic scale. The vertical dashed lines indicate the limits considered in our analysis for the main sequence of star-forming galaxies (±0.3 dex).