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Energy differences between frozen core and full core for B2PLYP/aug-cc-pVTZ

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For ()
  Energy (hartrees)
frozen core -579.8137836
correlated core -579.8523481
difference -0.0385645
  Energy (hartrees)
frozen core -579.8458859
correlated core -579.8824551
difference -0.0365692
  Energy (hartrees)
frozen core -579.8759649
correlated core -579.9133179
difference -0.0373529
  Energy (hartrees)
frozen core -579.8600532
correlated core -579.8972938
difference -0.0372406