Evolution of the TR statistics as a function of look-back time for CGs split by their assembly channels in each SAM. The statistics are computed using the properties of the two first-ranked galaxies selected at z = 0. The left plots display the statistics T₁ (first column) and T₁^* (second column), while the right plots show T₂ (first column) and T₂^*(second column). Error bars are computed using the bootstrap resampling technique. Horizontal solid lines indicate the reference values of 1 and 0.7 for the statistics.