Polarization images (superimposed on the total-intensity image) of 3C 345, when a) we average the D-terms estimated from the visibilities of a set of sources (3C 345, BLLAC, and 0716+714) and b) we use the D-terms directly estimated from the visibilities of 3C 345. The FWHM of the restoring beam is shown at the bottom-left corners.
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