The graphics user interface (GUI) of EDP showing
the viewing port, the panel with the control buttons, as well as 2 results
sections, one with the positions of the reflections used to index the lattice,
and one with the results of the lattice refinement.
The purpose of EDP is to facilitate the indexing and subsequent processing of electron diffraction patterns, whether they're collected on photographic film or on a slow-scan charge-coupled device (CCD) camera. To this end, EDP was developed with a GUI, which enables the user to simply click on three reflections - which surround the central beam -, to index them, and to subsequently compute the lattice vectors as well as the position of the central beam of the electron diffraction pattern. Next, EDP allows the user to modify a large set of variables that are used in the subsequent processing of the pattern. After modification of these variables, a processing script can be written out, that can be run off-line.
Below is the entry point to the tutorial on this entire procedure pertaining to the usage of the program EDP.