Polarization of a test star as a function of its distance for the same set of sightlines as shown in Fig. 18. The first and second rows show the cumulatives of the radial profiles of the differentials δq and δu as a function of distance. The third and fourth rows show the degree of polarization and polarization angle observed for the test star, as derived from the cumulatives of derived δq and δu. For p^★ < 0.05%, ψ^★ is masked (shown by thin gray line).