Stacked images of the transformed Stokes parameters Qr (top) and Ur (bottom) for SMICAE-mode hot spots. The rotation of the plane of polarization will act to leak the signal from Qr into Ur. The quadrupole pattern in the bottom plot is related to subpixel effects (Planck Collaboration XV 2014; Planck Collaboration XI 2016); fortunately, our results are insensitive to this feature, because it disappears in an azimuthal average (see Sect. 5.1).
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