Constraints on the NLA model alignment amplitude A_IA, from various subsamples of GAMA and SDSS (Table 1), plotted against sample properties. The constraints illustrated here are also given in Table B.1. Top left panel: A_IA vs. shape sample red galaxy fraction. We interpolate (green line/shading) between our fits to blue (blue square) and red (red square) galaxy samples, according to , where f_red is the red fraction and we assume linearity in the contributions of galaxy populations to the total alignment signal/amplitude. The inconsistency of mixed-sample signals (open points) with this interpolation is due to variable contributions of satellite galaxies – this is discussed in Sect. 4.2.2. Top right panel: A_IA vs. shape sample luminosity (as a ratio to the pivot L_piv ∼ 4.6 × 10¹⁰ L_⊙, corresponding to absolute r-band magnitude M_r = −22). Bottom right panel: A_IA vs. shape sample mean redshift. All plotted data points illustrate the mean and 68% confidence interval of 1D marginalised posterior distributions on A_IA, after fitting to relevant alignment/clustering signals. Only the filled points are independent of each other; each of the open points is in some way correlated with the others. Dashed lines and shading indicate the mean and 68% CI of the total-colour fits, highlighting the type-dependence of alignments.