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Fig. 2

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Intensity (left), Stokes q0 (middle), and u0 (right) images observed on 2020 January 3. North is right, and east is up. The FOV is ~ 19″ × 64″ (smaller than original FOV because of trimming). The parallelograms are the sampling regions. The values of q0 and u0 on the sky are scattered because of division of ~0 by ~ 0.
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