Percentage fraction in total marginal posterior error of f_δ, mn due to uncertainties in the lensing kernel and IA parameter. Shown is the statistical error relative to the full marginal error (RMS variance of posterior) as a function of k in three redshift bins without marginalisation (solid lines), with marginalisation over errors in the source redshift distributions only (dashed lines), Ω_m in the lensing kernel only (dash-dotted lines), and for the A_IA error only (dotted lines).