Action space for five of the most significant merger remnants in the 09–18 M31 galaxy. From top to bottom: X-Z density maps, J_z − J_r space, (J_r − J_z)/J_tot − J_ϕ/J_tot plane, and plane. Similar to Fig. 11 (for the entire accreted population), the individual merger debris completely fill the (J_r − J_z)/J_tot − J_ϕ/J_tot plane; nevertheless, different remnants peak at slightly different regions of the diagram depending on the orbital parameters. The interesting feature, seen in the second row, is that the merger remnants show a different ratio of J_z to J_r. Some substructures, however, can be seen at the very large radial and vertical actions, which correspond to the outer parts of the debris where the dynamical time is longer and, thus phase mixing is not yet completed for the most recent mergers at z = 0.