Sources with a successful phase-transfer calibration. Contours at 14.4 GHz are shown in blue; at 43.1 GHz, in green. Notice the short red lines close to the image peaks, which indicate the direction and magnitude of the core shifts. The FWHM of the restoring beam in all images is 0.6 × 0.6 mas. The optically-thin components used as astrometry references in the SFPR analysis (Sect. 3.2) are indicated with crosses. The uncertainties in the core shifts (Table 4) are not shown in this figure for clarity.
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