For the photometric survey with pessimistic settings, comparison of each Fisher marginalised (light grey) and unmarginalised (dark grey) errors on the cosmological and nuisance parameters, for: CF/int/CLASS (blue circles) versus CF/int/CAMB (orange squares) versus MP/Fisher (green stars) versus the public EP:VII results (red crosses, referred in the legend as IST:F). Each forecasted error σ_i for each case and parameter is compared to the median of the four cases, and the discrepancy is expressed in percent.