Oriented stacking of polarization fields (Q, U) on temperature maxima (upper panels) and P_T maxima (lower panels). In both cases the threshold ν = 0 is used and the orientation is chosen such that U_T = 0 and Q_T ≥ 0 on the central peak. The image units are  μK. The left panels are the stacked SMICA maps, and the right panels their NFEAs. See Fig. 46 for the meaning of the headless vectors (black dashed lines).