   Exercise: Analysis of the phase transition on Nd2NiO4
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   We provide here an IRF file of the old D2B at ILL and
   two diffraction patterns taken on Nd2NiO4 at RT and
   at 1.5K. The compound is magnetically ordered at RT.
   There is a phase transition from Bmab (HT) -> Pccn (LT)
   that is accompanied by strong micro-structural effects
   due to anisotropic micro-strains related to micro-twinning.
   This example is provided for information and for illustration
   of what can be done using FullProf. Some comments on this
   example are provided in the FullProf manual.


