PDFs of last ${\overline{t}}_{\text{LB}}$ for minor and major mergers, showing distributions for the full LSB and HSB populations (panel a), dispersion-supported (panel b) and rotation-supported galaxies (panel c). Panels d–g show the distributions binned by stellar mass, while panels h–k and l–o further divide the sample by stellar mass and dynamical state, for dispersion-supported and rotation-supported galaxies, respectively. HSBs are represented by solid orange bars and LSBs are as white bars with diagonal hatching. To aid visual interpretation of number densities, we include mirrored vertical black lines along the boxes. In panel a, the horizontal red dashed lines with annotations mark the look-back times of the divergence events listed in Table 1. For statistical definitions, refer to Section 2.2.