[gmx-users] mix berger ff with opls

[BIN ZHANG]

Dear all:

I was trying to convert the lipid.itp downloaded from Tieleman's  
website to the format compatible with OPLS. I basically followed the  
procedure in this post, which is really helpful:
http://www.mail-archive.com/gmx-users@gromacs.org/msg03459.html

But there is one comment there I don't understand:
after changing c6/c12
to sigma/epsilon. (gives effective fudgeLJ of 0.125).
  Can someone please explain what this means? Why do I have this  
effective fudgeLJ?
Thanks a lot,Bin

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