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Energy differences between frozen core and full core for B2PLYP/6-31G(2df,p)

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  Energy (hartrees)
frozen core -579.7602065
correlated core -579.7733013
difference -0.0130948
  Energy (hartrees)
frozen core -579.7921851
correlated core -579.8049178
difference -0.0127327
  Energy (hartrees)
frozen core -579.8224542
correlated core -579.8353198
difference -0.0128656
  Energy (hartrees)
frozen core -579.8061319
correlated core -579.8190623
difference -0.0129304