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Core CIF Dictionary version 2.3




Category: diffrn_refln

Data type: char

Must appear in a looped list containing '_diffrn_refln_index_'
Must match a value of '_diffrn_reflns_class_code'


   The code identifying the class to which this reflection has
   been assigned. This code must match a value of
   _diffrn_reflns_class_code. Reflections may be grouped into
   classes for a variety of purposes. For example, for modulated
   structures each reflection class may be defined by the
   number m=sum|m~i~|, where the m~i~ are the integer coefficients
   that, in addition to h,k,l, index the corresponding diffraction
   vector in the basis defined for the reciprocal lattice.

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