   Exercise: Analysis of the fluorite Yb2ZrWO8
   ----------------------------------------
   We provide here an IRF file for same conditions of an X-ray diffraction
   pattern taken on Yb2ZrWO8 in a pure Kalpha1 diffractometer. 
   The problem is, using Le Bail fit or the Rietveld method, the determination of of the 
   micro-structural parameters of this fluorite sample.

   Space group: F m -3 m
   Unit cell  : a = 5.185 Angstroms
   The wavelength is Lambda = 1.54060 Angstroms. 
   The format of the data files corresponds to INSTRM=10 in FullProf.


