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Energy differences between frozen core and full core for MP4/cc-pVTZ

19 06 19 13 52
For ()
  Energy (hartrees)
frozen core -168.3358211
correlated core -168.3795526
difference -0.0437315
  Energy (hartrees)
frozen core -168.3372893
correlated core -168.3808657
difference -0.0435763