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For more information about the HDF file format, please go to http://www.hdfgroup.org/ 

The Tomography Nexus format (which is stored in HDF5) is described as follows from the Pandata Europe Deliverable 5.3

5.3 Tomography Raw Data

This is again a scan around the sample rotation axis. However, in tomography it is common to collect dark field and bright field images before, during and after the actual sample scan in order to be able to correct the data for detector effects. For data reduction the order in which those images have been collected is important.

• entry:NXentry
  • title
  • start_time
  • end_time
  • definition
  • instrument:NXinstrument
    • NXsource
      • type
      • name
      • probe
    • detector:NXdetector
      • data[nFrames,xsize,ysize]
        • @signal=1
      • image_key[nFrames]
      • x_pixel_size
      • y_pixel_size
      • distance
  • sample:NXsample
    • name
    • rotation_angle[nFrames]
      • @axis=1
    • x_translation[nFrames]
    • y_translation[nFrames]
    • z_translation[nFrames]
  • control:NXmonitor
    • data[nFrames]
  • data:NXdata
    • data --> /NXentry/NXinstrument/data:NXdetector/data
    • rotation_angle --> /NXentry/NXsample/rotation_angle

Where image_key is an array which holds for each image either 0,1 or 2 depending if it is a sample, bright field or dark field image.