+ ?{start time of measurement} ?{end time of measurement} {Name of Source} {Type of Source} "{Neutron|X-ray}" {nominal wavelength selected} + {Polar Angle, commonly known as two theta} {Polar Angle, or two theta as an array with values for each detector element} {The counts detected in each detector element} {Efficiency correction coefficients for each detector element} monitor | timer {preset value for monitor or timer} {Monitor counts} {Descriptive name of sample} ? { Optional rotation angle for the case when the powder diagram has been obtained through an omega - two theta scan like from a traditional single detector powder diffractometer} + {Link to detector counts in NXdetector} {Link to polar angle data in NXdetector}