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It should be noted that there are a number of keywords which
are not defined by the PDFs. These are:
- Keywords which refer solely to the way in which the FITS
tape itself is written ( e.g. SIMPLE, BITPIX, BLOCKED,
BSCALE, BZERO, TAPENAME, END). These keywords must be
added by the software that creates the FITS files.
- The mandatory keywords NAXIS and NAXISn should also be
determined by the FITS-writing software at the point of writing
to tape, in order to ensure consistency with the data-array.
- It is possible for the observer to specify an arbitrary number of
comments during an exposure, which will be written as COMMENT
records to the FITS header.