Left panel: vs. the for all 552 circular regions in bin 1 (light blue), 2 (green), and 3 (purple). Horizontal dashed lines show: (i) the value of 1, corresponding to equal power in E and B modes; (ii)the value of 0.52, as reported in P16XXX. The inset shows the mean and standard deviation of for all multipole bins to highlight the increase of the ratio at high column density. The mean values are computed in bins of that contain 20 data points each. Right panel: scatter plot of vs. . Colors are same as in the left panel. Horizontal dashed lines show: (i) the value of 0, corresponding to absence of correlation between intensity and E modes; (ii) the value of 0.36, as reported in P18XI. The solid line shows a fit of for . The gray-shaded areas in both panels refer to regions dominated by instrumental noise and data systematic effects.