Dear Prof Gerard:
     In fact I have read your Model Validation on-line, and I have to say it
is youe lecture
that made me to think about this problem, though I have used it as a common
stand for
the quality of the model without understand it for a long time.
     And the http://en.wikipedia.org/wiki/Molecular_geometry and
http://en.wikipedia.org/wiki/Dihedral_angle, I think both from your
lecture, I have checked
them today before I post my mail, but unable to access them. For some
reason, wiki is
forbiddon here. I really coouldnot find the best answer and have discussed
with others
before, so I just want to make it clear, though maybe nothing to do with
practicals.
    Thanks for your reply again.

Best Regards!

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