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

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  Energy (hartrees)
frozen core -579.1214616
correlated core -579.2529892
difference -0.1315275
  Energy (hartrees)
frozen core -579.1516779
correlated core -579.2764252
difference -0.1247473
  Energy (hartrees)
frozen core -579.1821891
correlated core -579.3094854
difference -0.1272963
  Energy (hartrees)
frozen core -579.1666269
correlated core -579.2932732
difference -0.1266462