Relative orientations of pixelized star polarization angles and the position angle of the RW (red, top row) or the Galactic midplane (gray, bottom row). Panels A and C show distributions for stars within 400 pc, while panels B and D those for stars beyond 1.2 kpc. The vertical gray band in each panel is centered on the circular mean of each distribution (dashed vertical line) and has a width equal to two times the uncertainty on that mean.