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1.1 Purpose

This standard formally defines the FITS format for data structuring and exchange that is to be used where applicable as defined in §1.3. It is intended as a formal codification of the FITS format that has been endorsed by the IAU  for transfer of astronomical data, fully consistent with all actions and endorsements of the IAU and the IAU FITS Working  Group (IAUFWG). Minor ambiguities and inconsistencies in FITS as described in the original papers are eliminated.