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

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  Energy (hartrees)
frozen core -579.1379682
correlated core -579.2295641
difference -0.0915959
  Energy (hartrees)
frozen core -579.1673215
correlated core -579.2570539
difference -0.0897323
  Energy (hartrees)
frozen core -579.1977038
correlated core -579.2873753
difference -0.0896716
  Energy (hartrees)
frozen core -579.1821419
correlated core -579.2722159
difference -0.0900740