Core dictionary (coreCIF) version 2.4.5
Data items in the DIFFRN_STANDARDS category record details about the set of standard reflections used to monitor intensity stability during the measurement of diffraction intensities. Note that these records describe properties common to the set of standard reflections, not the standard reflections themselves.Example:
Example 1 - based on data set TOZ of Willis, Beckwith & Tozer
[Acta Cryst. (1991), C47, 2276-2277].
_diffrn_standards_number 3 _diffrn_standards_interval_time 120 _diffrn_standards_decay_% 0