Comparison of marginalised 68% confidence intervals on and w₀, forecasted for varied sets of nuisance parameters, with (stars) and without (circles) the application of our intrinsic alignment parameter priors. Diamonds illustrate cases with perfect knowledge of the alignments in the simulated data. The intervals are plotted as ratios to the fiducial case (cyan), where NLA parameters and photo-z distributions are perfectly known. Dotted lines denote cases with the “Informative” photo-z bias priors (Table 4), and solid lines those without any prior. Nuisance (free) parameters are denoted for each case by curly brackets in the legend.