Posteriors for the best-fitting power law for the variation between the alignment amplitude and halo mass (Eq. 22), for galaxies in the 2.8 Gpc fiducial run. Posteriors for the simple iterative, reduced iterative, simple non-iterative and reduced non-iterative total inertia tensors are shown, considering only the particles within the half-mass radius. The effect of the choice of inertia tensor scheme on the slope is less than 1σ, and constitutes only an amplitude scaling.