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

19 06 19 13 52
For NH3 (Ammonia)
  Energy (hartrees)
frozen core -412.6804449
correlated core -412.6962984
difference -0.0158535
  Energy (hartrees)
frozen core -412.6813496
correlated core -412.6966860
difference -0.0153364