Fig. 3
Top left: total intensity radio contours of 3C 338 at 8415 MHz overlaid on the RM image. The angular resolution is 2.5″ × 2.5″. Contour levels are drawn at: 0.06, 0.12, 0.24, and 0.96 mJy/beam. Top right: the histogram of the RM values. Bottom: sample plots of the observed position angle versus the squared wavelength at different source locations. The inset is a zoom of the observed polarization angle corresponding to frequencies between 4585 and 8415 MHz.
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