How was the most recently identified contender, Quipu, primarily traced?

Answer

Using an X-ray satellite and a 'friends-of-friends' algorithm

Quipu was identified using different techniques than the H-CB GW, specifically employing an X-ray satellite and a 'friends-of-friends' algorithm applied to trace galaxy clusters.

How was the most recently identified contender, Quipu, primarily traced?

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