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

19 06 19 13 52
For HCCBr (Dicyanoketenimine)
  Energy (hartrees)
frozen core -596.9667327
correlated core -596.9780254
difference -0.0112926
  Energy (hartrees)
frozen core -596.9938490
correlated core -597.0050407
difference -0.0111917