Generalized resonance models analysed at ℓ_max = 2000 (E-modes ℓ_max = 1500) for the different Planck foreground separation methods, SMICA (blue), SEVEM (red), NILC (green), and Commander (yellow), together with the SSN (SMICA – SEVEM – NILC ) average (black). The upper panels apply to the constant resonance model (Eq. (10)), with T-only (left) and T+E (right), the middle panels give results for the equilateral resonance model (Eq. (13)), and the lower panels for the flattened resonance model (Eq. (14)). Both the equilateral and flattened resonance models produce broad peaks, which are reinforced with polarization (middle and bottom right panels).