Additional FITS headers in primary extension.
|CPIX21||Coord of extraction, axis 2, segment 1|
|CPIX11||Coord of extraction, axis 1, segment 1|
|AP_RAD||Squared radius of aperture. See Sect. 2.1|
|SPLIT||Time extraction split at (0 if no split used)|
|CPIX22||Coord of extraction, axis 2, segment 2|
|CPIX12||Coord of extraction, axis 1, segment 2|
|RA_EXT||RA of central extracted pixel, segment 1. Derived from supplied WCS data|
|Dec_EXT||Dec of central extracted pixel, segment 1. Derived from supplied WCS data|
|DETNBINS||Number of bins used in each axis for detrending (see Sect. 2.2)|
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