S5 polar cap sample sources in year 2000 (at 15 GHz, in blue contours) and in year 2010 (at 14.4 GHz, in red contours). The sources have been shifted to set their intensity peaks at the coordinate origin. The contours are spaced logarithmically from 0.75% to 99% of the source peaks. The restoring beams have a FWHM of 1 × 1 mas.
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