Misalignment angle between polarization data (rotated by 90°) and starlight polarization measurements as a function of the stellar distance for Planck data at 353 GHz (top-left panel), H I polarization templates (top-central panel), and Planck data at 30 GHz (top-right panel). The misalignment is shown in green and pink for the northern and southern he mispheres, respectively. The misalignment peaks at the edge of the LB in cyan. With the same color scheme, the bottom panels show the average normalized kurtosis of the corresponding Δψ distributions. The uncertainty is the standard deviation between the two versions of each dataset. The gray shaded area represents the standard deviation of the average kurtosis of a normal distribution in the case of low-number statistics, as for the number of stars per distance bin (approximately 20).