Density maps of a 2 kpc × 2 kpc region after CM2 has evolved for 12 Gyr. The origin is at the Galactic centre. Projections on the xy (left panel), xz (middle panel), and yz (right panel) planes are shown. During and after the merger, the composite GC loses its stars along its orbit producing a low-density background that mixes with and contributes to the thick disc population. The GC is the denser, approximately round overdensity visible in each of the panels.