Fig. 3.
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Band 3 (227.1 GHz) M87* total intensity amplitude and phase data measured in 2017, 2018, and 2021. The calibration applied is the pipeline-based signal stabilization and a priori flux density calibration without image-based self-calibration. The 2017 and 2018 data were produced by EHT-HOPS, and the 2021 data by rPICARD. The grey bands around 3.4 Gλ indicate the approximate location of the first visibility minima.
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