These simulations include only dark matter. For consistency with the baryonic simulations, we label the simulation name (such as m12i_res7100) according to the baryon particle mass resolution in the equivalent baryonic simulation. Because they have no baryon particles, these simulations contain half the number of particles total. To ensure the same matter density, the high-resolution dark-matter particles in these simulations contain the mass of baryons, so high-resolution dark-matter particles are ~20% more massive (according to Omega_b / Omega_dm).

Most dark-matter-only simulations have a subset of 61 out of 601 snapshots available, specifically, every tenth snapshot. However, we provide halo catalog and merger trees across all ~600 snapshots. A few simulations are missing some snapshots (Romeo&Juliet, Romulus&Remus, Thelma&Louise), and m12z has only a single snapshot at z = 0. See notes.txt within each simulation directory.