Macromolecular dictionary (mmCIF) version 2.0.09
The ratio of the mean of the intensities of the significantly intense reflections (see _reflns.threshold_expression) in this shell to the mean of the standard uncertainties of the intensities of the significantly intense reflections in this shell.
Mandatory item: noAlias:
_reflns_shell_meanI_over_sigI_gt (cif_core.dic version 2.3)
Related item: _reflns_shell.meanI_over_uI_gt (replaces)