Posteriors for the best-fit power law for the variation between the alignment amplitude and halo mass (Eq. 22), for galaxies in the 1 Gpc fiducial run. Posteriors for the simple and reduced (iterative) stellar inertia tensors are shown, considering only the particles within the half-mass radius, and recomputed considering all bound particles. The recomputed inertia tensors have a lower amplitude and steeper slope compared to the tensor calculated using only the particles within the half-mass radius.