XmlmmCIF equivalent: diffrn Data items in the DIFFRN category record details about the diffraction data and its measurement. XmlmmCIF equivalent: diffrn/ambient_environment The gas or liquid surrounding the sample, if not air. XmlmmCIF equivalent: diffrn/ambient_pressure The mean pressure in kilopascals at which the intensities were measured. XmlmmCIF equivalent: diffrn/ambient_pressure_esd The estimated standard deviation of _diffrn.ambient_pressure. XmlmmCIF equivalent: diffrn/ambient_temp The mean temperature in kelvins at which the intensities were measured. XmlmmCIF equivalent: diffrn/ambient_temp_details A description of special aspects of temperature control during data collection. XmlmmCIF equivalent: diffrn/ambient_temp_esd The estimated standard deviation of _diffrn.ambient_temp. XmlmmCIF equivalent: diffrn/crystal_id This data item is a pointer to _exptl_crystal.id in the EXPTL_CRYSTAL category. XmlmmCIF equivalent: diffrn/crystal_support The physical device used to support the crystal during data collection. XmlmmCIF equivalent: diffrn/crystal_treatment Remarks about how the crystal was treated prior to intensity measurement. Particularly relevant when intensities were measured at low temperature. XmlmmCIF equivalent: diffrn/details Special details of the diffraction measurement process. Should include information about source instability, crystal motion, degradation and so on. XmlmmCIF equivalent: diffrn/id This data item uniquely identifies a set of diffraction data.