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Spatial files
It is possible to use a spatial file (as produced by REGIONS or
WELLARD - now XRTARD) to define a 2-d region on an n-d datafile. This
file may be used to set the QUALITY of the pixels in the region by
setting FSEL=YES on the QUALITY command line. A shortform command,
ARDQUAL, is available which basically performs an IGNORE operation
on the pixels within the region specified.
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