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Keywords:

  • computer programs;
  • graphical user interface;
  • powder diffraction;
  • Rietveld analysis.

A description and justification of the EXPGUI program is presented. This program implements a graphical user interface and shell for the GSAS single-crystal and Rietveld package. Use of the Tcl/Tk scripting language allows EXPGUI to be platform independent. Also included is a synopsis of how the program is implemented.