Final sizes of the simulated early-type galaxies as a function of the number of the major (left) and minor (right) mergers that the galaxies have undergone. The colored squares are median effective radii of the galaxies at different mass bins. The error bar of each square point is 1σ of the average effective radii of 200 bootstrap resampling. The early-type galaxies that have experienced more (major/minor) mergers have larger sizes than the counterparts that have experienced fewer mergers.