Power spectra of the FoCUS maps for different combinations of the three loss terms Loss_1; Loss₂, and Loss₃. Top plot: ratio of the EE spectra of the residual map, , and the input dust model s_m. Bottom left plot: compares the TE spectra obtained with or without Loss₃, in red and grey, respectively. Bottom right plot: compares the cross spectra between FoCUS map and the mock data d with or without Loss₂, in red and yellow, respectively. All of the spectra are binned in ℓ bins with a width ∆ℓ = 10.