raw, 2-D SAS data with an area detector with a time-of-flight source It covers all raw data from any SAS techniques that use an area detector at a time-of-flight source. NeXus convention is to use "entry1", "entry2", ... for analysis software to locate each entry Official NeXus NXDL schema to which this file conforms type of radiation source Name of the radiation source The collimation length This is area detector data, of number of x-pixel versus number of y-pixels. Since the beam center is to be determined as a step of data reduction, it is not necessary to document or assume the position of the beam center in acquired data. The distance between detector and sample Physical size of a pixel in x-direction Size of a pixel in y direction This is the x position where the direct beam would hit the detector. This is a length, not a pixel position, and can be outside of the actual detector. This is the y position where the direct beam would hit the detector. This is a length, not a pixel position, and can be outside of the actual detector. Name of the instrument actually used to perform the experiment Descriptive name of sample Count to a preset value based on either clock time (timer) or received monitor counts (monitor). preset value for time or monitor