They had 4 independent teams, blinded to each other's work, using different approaches, so that they could be sure they were doing it right. And, FYI, that ring you see? The light doesn't come straight. Photon paths are strongly bent around the black hole. And light coming from the side of the plasma disk that is headed our way has a huge Doppler boost compared to light from the receding side.
UPDATE: At the journal club today, Halzen said that one of the journalists at the press conference asked why the picture was so blurry. We got a good laugh out of that. If I understand correctly, this is the highest resolution image ever taken.
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