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Energy differences between frozen core and full core for MP2/6-31G(2df,p)

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For ()
  Energy (hartrees)
frozen core -169.4894267
correlated core -169.5125344
difference -0.0231076
  Energy (hartrees)
frozen core -169.4988849
correlated core -169.5220257
difference -0.0231407
  Energy (hartrees)
frozen core -169.4938051
correlated core -169.5170404
difference -0.0232352