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

19 06 19 13 52
For ()
  Energy (hartrees)
frozen core -957.9655143
correlated core -958.0476863
difference -0.0821720
  Energy (hartrees)
frozen core -957.9666521
correlated core -958.0485336
difference -0.0818815