Dark matter spiral arms in other simulations. Sgr-NBody (upper two groups of panels): stellar density (first column), DM density (second column), ⟨V_R⟩ (third column), and ⟨V_ϕ⟩ (fourth column) after the second and third passages of a Sgr-like perturber (first and second rows, respectively). Hydro (bottom left group): stellar and DM density for two snapshots with strong spiral arms. Au27 (bottom right group): stellar and DM density for the last two snapshots in the simulation, z = 0 and z = 0.023.