header : astropy.io.fits.Header
Header from which the bad keywords (as defined by the software that
recorded the image) should be purged.
history : bool
If True write detailed history for each keyword removed.
force : bool
If True, force keywords to be purged even if the FITS header
indicates it has already been purged.
file_name : str, optional
Name of file containing the header; if provided it is used to generate
more informative log messages.
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