Fig. 6.
Top: the distance between the two VLBI cores that are detected at the same frequency provides a good estimate of the distance between the two SMBH, BH1 and BH2, if ejection directions of the VLBI jets are equal to within few degrees. Bottom: when the jets are ejected in opposite directions or in very different directions, then the distance between the two VLBI cores is very different than the distance between the two SMBH.
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