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

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  Energy (hartrees)
frozen core -579.0628702
correlated core -579.0788424
difference -0.0159722
  Energy (hartrees)
frozen core -579.0948422
correlated core -579.1101331
difference -0.0152909
  Energy (hartrees)
frozen core -579.1227865
correlated core -579.1382998
difference -0.0155133
  Energy (hartrees)
frozen core -579.1080314
correlated core -579.1235646
difference -0.0155332