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Energy differences between frozen core and full core for B2PLYP/daug-cc-pVTZ

19 06 19 13 52
For NaH (sodium hydride)
  Energy (hartrees)
frozen core -217.0631920
correlated core -217.0838759
difference -0.0206838
  Energy (hartrees)
frozen core -217.0632014
correlated core -217.0837751
difference -0.0205737