Fig. 6

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Naturally weighted total intensity CLEAN image of 3C 273 at 15.4 GHz (top). The alignment error (in beam widths) along the jet as a function of frequency ratio (middle). The alignment error (in beam widths) perpendicular to the jet (bottom). The error is defined as rν1−rν2 where rν1 is the position in the low-frequency image and rν2 is the corresponding position in the high-frequency image. The different spectral index gradients are shown in different colors: −0.1 mas-1 (black squares), −0.2 mas-1 (blue crosses), and −0.3 mas-1 (red circles).
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