(IUCr) CIF Definition save__map_segment.mask_array_id

DRAFT DICTIONARY CBF/imgCIF Extensions Dictionary | Draft version 1.5 for comment

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Index

##### Image dictionary (imgCIF) version 1.5.4

# _map_segment.mask_array_id

Name:
`'_map_segment.mask_array_id'`

Definition:

           The value of _map_segment.mask_array_id, if given, the array
                  structure into which the mask for the map is organized.  If no
                  value is given, then all elements of the map are valid.  If a
                  value is given, then only elements of the map for which the
                  corresponding element of the mask is non-zero are valid.  The
                  value of _map_segment.mask_array_id differs from the value of
                  _map_segment.array_id in order to permit the mask to be given
                  as, say, unsigned 8-bit integers, while the map is given as
                  a data type with more range.  However, the two array structures
                  must be aligned, using the same axes in the same order with the
                  same displacements and increments

                  This item is a pointer to _array_structure.id in the
                  ARRAY_STRUCTURE category.

Type: code

Mandatory item: implicit

Category: map_segment

#### HTML version of draft dictionary created by modified version of makedicthtml by B. McMahon from modified version of imgCIF dcitionary 1.3.2 which is subject to the following copyright:

Copyright © 2005 International Union of Crystallography