Benchmark A₂ extraction with getsf (three top rows) and getold (three bottom rows). Ratios of the measured fluxes F_Tλn, peak intensities F_Pλn, and sizes {A, B}_λn to their true values (F/F_T, I/I_T, A/A_T, and B/B_T) are shown as a function of the S/N ratio Ω_λn. The size ratios A/A_T and B/B_T are also shown as a function of the true sizes {A, B}_λnT. The mean 𝜚_{P|T|A|B}λ and standard deviation σ_{P|T|A|B}λ of the ratios are displayed in the panels. Similar plots for λ ≤ 110 μm with only bright protostellar cores are not presented, because their measurements are quite accurate, with 𝜚_{P|T|A|B}λ ≈ {0.999|0.998|0.999|0.999} and σ_{P|T|A|B}λ ≈ {0.002|0.006|0.00004|0.00004}.