Top: median fraction of the mass at z = 0 acquired by mergers due to major mergers for galaxies with f_merg > 0.4. The red and blue lines use stellar mass ratios between 1:1 and respectively 1:3 and 1:5 to define major mergers. The error bars are bootstrap estimates of the uncertainties of the mean fractions. Bottom: geometric mean mass ratio of mergers for galaxies with f_merg > 0.4 at z = 0. The error bars are bootstrap estimates of the uncertainties of the geometric mean ratios. The red and blue horizontal lines respectively represent the 1:3 and 1:5 limits of major mergers.