Marginalized one-dimensional constraints for cosmological and (a selection of) nuisance parameters, found by each of our stage III forecast configurations: γγ,  3 × 2 pt,  3^ph × 2 pt, and 6 × 2 pt, with colours and line-styles as in Fig. 12 (also given in the legend). The three columns give the unbiased, incoherently biased, and coherently biased forecasts, respectively, and points are grouped on the x axis according to the nuisance model employed by each forecast (see Table 2 for a summary of forecast configurations). Error bars illustrate the σ₆₈ interval, within which the posterior means are given as horizontal markers. y-axes then give the difference δp = p − p_ideal for parameter p relative to the idealized ($n_z^{\mathrm{true}}:\mathrm{do}\mathrm{nothing}$) case for each probe set (except for shift model parameters δz_i, where the difference is given relative to the fiducial truth, that is, the actual differences in the tomographic means, as we did not conduct shift model forecasts for $n_z^{\mathrm{true}}$).