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Hello Nimira--

> I was doing structure refinement and noticed that the IMPR energy is quite
> strange for different structures in the emsemble.
> I calculated 20 structures and 7 of them has IMPR energy less than 120 and
> 13 of them around 1500, a difference of one order.
> In the later case, the IMPR energy dominate the total energy.
> 
> Any one have any idea how this arise and how to fix it?
> 

Without the structures, it's hard to say. You might look at the
violations for each structure using the XPLOR statement

  print threshold=5 impr

(this output is given in the .viols files if using the Python interface.)

The high-energy structures must have some badly violated impropers.

hope this helps--
Charles
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