Describes CIF, the data exchange standard of crystallography. Provides: information for scientists who wish to record or use the results of a single-crystal or powder diffraction experiment; the data ontology necessary for designing interoperable computer applications; accompanying software including machine-readable CIF dictionaries, libraries and utility programs.
An essential guide and reference to CIF for programmers, data managers handling crystal-structure information and practising crystallographers.
This definition has been superseded and is retained here only for archival purposes. Use instead '_reflns_number_gt'
The number of 'observed' reflections in the _refln_ list (not the _diffrn_refln_ list). The observed reflections satisfy the threshold criterion specified by _reflns_threshold_expression (or the deprecated item _reflns_observed_criterion). They may include Friedel-equivalent reflections according to the nature of the structure and the procedures used. Special characteristics of the reflections included in the _refln_ list should be given in the item _reflns_special_details.