Power spectra of foreground emission in MD30 (red) and GD30 (blue) configurations, as well as their respective residuals present in the signal reconstructed with the GNILC (dashed red and dashed blue). The power spectra are plotted for frequency channels centered at 0.985 GHz (left), 1.115 GHz (center), and 1.255 GHz (right). The multipole range considered is 30 ≤ ℓ ≤ 270, with a multipole bin size of Δℓ = 12.