Ensemble of SELFI posteriors for the initial matter power spectrum θ conditional on the observed data Φ_O for different observational models, used to diagnose systematic effects. All the posteriors are derived from a single, common set of N-body simulations. They make it possible to disentangle individual systematic contributions by comparing their differential impact across the range of wave numbers spanned by the power spectra. The colour scales indicate the relative error associated with the systematic effects considered in each sub-figure. The solid yellow line denotes the prior mean θ₀ and the ground truth θ_gt is indicated by the dashed blue line. The vertical dashed lines indicate the support wave numbers for the initial matter power spectrum representation. The 2σ credible regions for the prior and the posterior with the well-specified Model A correspond to the shaded yellow and green areas, respectively. The posterior means γ are represented by the coloured continuous lines for varying degrees of misspecification. For clarity, their corresponding credible regions have been omitted. (a) Impact of misspecified linear galaxy biases. (b) Impact of misspecified linear extinction. (c) Impact of misspecified redshifts. (d) Impact of misspecified selection function variances. (e) Impact of misspecified number of holes. (f) Impact of misspecified selection function variances (varying) under misspecified linear extinction (fixed).