Fig. A.1.

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Stokes I contours and linear polarization intensity (shown in gray-scale) of NRAO 150 for the 12 GHz band derived using a priori calibration from rPicard/CASA, polarization leakage calibration from PolSolve, and absolute EVPA correction using CASA. The purple ellipse shows the restoring beam used. The contours start at 5σI up to the peak of Stokes I increasing by a factor of 2. The blue ticks show the average EVPA across a 5 × 5 pixel region.
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