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  _____      ___      ____      ______   __   __  
 / ____||   / _ \\   |  _ \\   /_   _//  \ \\/ // 
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  `----`  `-`   `-`  `-` --`   `-----`   `-`  --`

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Text this: Higher-order figure-8 microphones/hydrophones collocated as a perpendicular triad-their "spatial-matched-filter" beam steering