Polarization map based on the observed sample of nearby stars (d < 50 pc), plotted in Galactic coordinates. The length of the bars is proportional to the degree of polarization and the orientation gives the direction of the maximum electric vector. Regions with aligned polarization vectors can be seen, suggesting filament-type structures. Two different polarization scales are used for clarity, as indicated in the bottom of the panel. For low observed degrees of polarization, p < 2σ (no detection), only a cross with bar lengths, σ, is plotted.