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Fig. 1
(Left) VLBA image of Mrk 421 at 43 GHz corresponding to the November observation of BG207 campaign, contoured at 
× 0.55 mJy/beam. (Right) VLBA image of Mrk 421 at 43 GHz corresponding to April observation of the Boston University monitoring program, contoured at 
mJy/beam.
This figure is made of several images, please see below:
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