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Energy differences between frozen core and full core for B2PLYP/aug-cc-pVDZ

19 06 19 13 52
For SO3- (Sulfur trioxide anion)
  Energy (hartrees)
frozen core -958.7307395
correlated core -958.7359120
difference -0.0051724
  Energy (hartrees)
frozen core -958.7320509
correlated core -958.7371942
difference -0.0051433