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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 -581.0364066
correlated core -581.0489241
difference -0.0125175
  Energy (hartrees)
frozen core -581.0369767
correlated core -581.0494880
difference -0.0125114
  Energy (hartrees)
frozen core -581.0002859
correlated core -581.0126428
difference -0.0123569