International
Tables for Crystallography Volume G Definition and exchange of crystallographic data Edited by S. R. Hall and B. McMahon © International Union of Crystallography 2006 |
International Tables for Crystallography (2006). Vol. G. ch. 2.2, p. 27
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(29) Data names may not exceed 75 characters in length.
(30) Data-block codes and save-frame codes may not exceed 75 characters in length (and therefore data-block headers and save-frame headers may not exceed 80 characters in length).