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

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For ()
  Energy (hartrees)
frozen core -579.1403162
correlated core -579.2362790
difference -0.0959629
  Energy (hartrees)
frozen core -579.1696589
correlated core -579.2631709
difference -0.0935120
  Energy (hartrees)
frozen core -579.2002933
correlated core -579.2940888
difference -0.0937955
  Energy (hartrees)
frozen core -579.1845716
correlated core -579.2786235
difference -0.0940519