Fig. 8
Residual polarization map after integrating each pixel over the FD ranges (−100 ± 50) rad/m2 and (+100 ± 50) rad/m2 and subtracting the results. Overlaid are the outlines of the ellipses used to integrate in the image plane. The outline of the ellipse on the 10-kpc ring is marked in boldface. Detected point sources have been masked (seen as white points).
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