Average number of crossings (𝒞_SFMS) for several bins of galaxies selected based on the galaxies’ currently observed position in the MZR and SFMS. In the upper panel, the diagonal lines represent the relations; the position of the numbers relative to them informs which positional bin (above or below the relation) is being considered. In the bottom panel the bins considering combinations of positions in both relations are shown, with the shaded areas indicating the position in each relation. The error is computed as the error of the mean and is indicated in parentheses: the last digit shown in the error corresponds to the last digit shown in the value. In the corners in red we indicate the number of galaxies included in each bin.