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Energy differences between frozen core and full core for MP3/cc-pVTZ

19 06 19 13 52
For ClOO+ (chloroperoxy cation)
  Energy (hartrees)
frozen core -412.7359295
correlated core -412.7997951
difference -0.0638656
  Energy (hartrees)
frozen core -412.7359789
correlated core -412.7997951
difference -0.0638162