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Header card images
shall consist of a keyword, a value indicator (optional unless a value
is present), a value (optional), and a comment (optional). Except
where specifically stated otherwise
in this standard, keywords may appear in any order.
A formal syntax, giving a complete definition of the syntax of
FITS card images, is given in Appendix A.
It is intended as an aid in interpreting the text defining the standard.
5/13/1999