Two-dimensional normalized histograms of the uncertainties in EVPA differences () and debiased polarized intensity at 353 GHz () for the control sample (top) and the target1 sample (bottom) using PR3 maps with no CMB subtraction. Both histograms are normalized and bounded to the same color scale. The two quantities are correlated: target1 has noisier EVPA differences than control, because of the lower polarized intensities in its pixels.