Left panel: metal-poor ([Fe/H] ≲−1.4) stellar density map of M 31 in standard tangential coordinates. Right panel: equivalent stellar halo of the simulated Aq-C, seen from 1 Mpc away. The displayed region is 300 × 300 kpc wide. To give a better sense of scale, a dashed purple circle with a radius of 100 kpc is drawn in both panels. Similar debris resulting from accretion events are easily seen in the halos of both M 31 and Aq-C. In the real and the simulated galaxy, the accreting substructures have anisotropic distributions on the sky. We note that the entire Aq-C stellar halo is built from accreted material since the simulations contain no in situ components.