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centroids-EXPID
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:Summary: JSON file containing centroid data associated with the guide cameras.
:Naming Convention: ``centroids-EXPID.json``, where EXPID is the zero-padded 8-digit
    exposure ID.
:Regex: ``centroids-[0-9]{8}\.json``
:File Type: JSON, 100 kB

Contents
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Each file contains a dictionary with the following top-level keys:

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Key              Description
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``expid``        Exposure number
``frames``       TODO: *Description needed.*
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