XmlmmCIF equivalent: cell_measurement_refln Data items in the CELL_MEASUREMENT_REFLN category record details about the reflections used in determination of the crystallographic cell parameters. The CELL_MEASUREMENT_REFLN data items would in general be used only for diffractometer data. XmlmmCIF equivalent: cell_measurement_refln/theta Theta angle in degrees of a reflection used for measurement of the unit cell. XmlmmCIF equivalent: cell_measurement_refln/index_h Miller index h of a reflection used for measurement of the unit cell. XmlmmCIF equivalent: cell_measurement_refln/index_k Miller index k of a reflection used for measurement of the unit cell. XmlmmCIF equivalent: cell_measurement_refln/index_l Miller index l of a reflection used for measurement of the unit cell.