Energy-angular momentum relation for each of the two most significant mergers at z = 0 per galaxy in our sample. The two left columns show the density distributions of each of the two mergers, the two middle columns are colour-coded by the mean distance (R₀) of stars inside the dwarf galaxies before they accreted, and the two right columns show the mean stellar age. This figure demonstrates that even a single merger event could result in a number of overdensities in the E − L_z space. More recent events tend to show more substructures; however, even the merger remnants from 9 − 10 Gyr ago are not featureless at z = 0. The R₀-gradient suggests how the internal structure of dwarf galaxies is being mapped into the L_z − E space once the system is accreted.