Generalized feature 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 left three panels apply to the equilateral feature models, showing, respectively, in the top panel the full feature survey significance at each frequency and phase (temperature only), the maximum significance at each frequency for temperature only (middle), and with polarization (lower). The right three panels apply to the flattened feature models, showing the maximum significance at each frequency for temperature only (top right) and with polarization (middle right), along with significance at each frequency and phase for temperature and polarization (right lower).