Effective amplitude of the large scale intrinsic alignment signal as predicted by model (ii) from Fortuna et al. (2021) (solid black line). The grey dashed lines shows the corresponding cumulative mean amplitude. Cosmological parameter inference with a constant IA amplitude will result in a low amplitude (grey region; see text for more details), because the relative importance of the IA signal over the cosmic shear signal is higher at low redshift (as indicated by the dashed red line).