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VLBA image of M87 at 43 GHz superimposed on the measured core-shift positions. K Hada et al . Nature 477 , 185-187 (2011) doi:10.1038/nature10387.
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VLBA image of M87 at 43 GHz superimposed on the measured core-shift positions. K Hada et al. Nature477, 185-187(2011) doi:10.1038/nature10387