Image Math is a tool to calculate the average and the median of all the diffractograms.

For this, navigate to the folder where the .edf images are saved and type the following to the Konsole:

  image_math_petra 'name stem' 'first number (usually 0)' 'last number' median

The program will create three new files, which are named the same as your previous .edf images, just with an 'm' in the middle.