Bob,

        These CIF items have to do with "modulated structures". I only have a  
"nodding acquaintance" with this concept, but I know these CIF items  
would not appear in a "normal" CIF. Is it only one, particular CIF  
that is giving that error? Then it must be one modulated structure  
that you have a CIF for.

        Here is a link to an IUCR definition of modulated structure:

                                
http://reference.iucr.org/dictionary/Modulated_crystal_structure

        And here is a link to the CIF items for modulated structures:

                                
http://www.iucr.org/__data/iucr/cifdic_html/1/cif_ms.dic/index.html


Pat

Patrick J. Carroll, Ph.D.
Director, X-ray Crystallography Facility
Department of Chemistry
University of Pennsylvania
Philadelphia, PA

Phone: 215-898-3505
Web: http://macxray.chem.upenn.edu





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