Top: S/N fluctuation map as a function of post-processing parameters on 1SHORT for β Pictoris b on-sky data. Middle: contrast curves calculated analytically with FastCurves (in red) and empirically with β Pictoris b on-sky data (in blue) on 1SHORT for various postprocessing techniques. Bottom: S/N curves calculated similarly. The plots are given at the planet’s separation (ρ ≈ 0.5″) and for 90 principal components subtracted when the PCA is applied. For FastCurves estimations, as in Fig. 9, systematics (M_sim) where fringes and straylight were incorrectly subtracted by the pipeline had to be considered (see Sect. 5).