Examples of matched haloes in the m₁₀ run (upper row) and the m₉ run (bottom row). The left panels of figures (a), (b) and (c) show the host halo with the projected ellipse and orientation angle over plotted, with the right panels showing the resolved substructures that are excised from the host halo before calculating the inertia tensor. This sources an additional scatter over that from sampling noise. (a) shows an example for which the effect is relatively small, causing a misalignment of only a few degrees. (b) is an example of a more spherical halo that is hence more sensitive to the removal of low mass substructures. (c) is another spherical halo for which the orientation angle of the m₉ run is almost orthogonal to that from the m₁₀ run.