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Energy differences between frozen core and full core for MP2/aug-cc-pVDZ

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For ()
  Energy (hartrees)
frozen core -169.4476363
correlated core -169.4557663
difference -0.0081301
  Energy (hartrees)
frozen core -169.4561314
correlated core -169.4642871
difference -0.0081558
  Energy (hartrees)
frozen core -169.4505277
correlated core -169.4586591
difference -0.0081314