Definition:
Identifies the data set used as an external standard for the diffraction angle or the intensity calibrations. *_name specifies the name of the material and *_id the _pd_block_id for the CIF containing calibration measurements. If more than one data set is used for calibration, these fields may be looped.
May appear in list containing _pd_calib_detector_id
Type: char
Category: pd_calib
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