Input spectral behaviour of dust, clustered CIB, IR, and radio point sources of SET1 simulations at f_sky= 0.5, plotted as C_{ℓ = 3000}. Radio and IR point sources are labelled “rad” and “ir”, respectively. Infrared point sources, cCIB, and dust, plotted in blue, green, and orange, respectively, present similar emission laws. The CMB black-body emission law, which is not fitted for, is plotted in black.