Extended Data Fig. 7: Projected matter density in the present-day initial conditions for the five N-body simulations in the centre-of-mass frame.

In each case, the MW is located at the bottom right, with the LMC perceptible as a small substructure close to the cenre of the MW. M31 and M33 are located in the top left. Differences between the five systems are subtle, reflecting the (small) differences in the present positions, and the differences in masses.