Macromolecular dictionary (mmCIF) version 2.0.09
The percentage decrease in the mean of the intensities for the set of standard reflections from the start of the measurement process to the end. This value usually affords a measure of the overall decay in crystal quality during the diffraction measurement process. Negative values are used in exceptional instances where the final intensities are greater than the initial ones.
Mandatory item: noAlias:
_diffrn_standards_decay_% (cif_core.dic version 2.0.1)
The permitted range is (-infinity, 100.0]