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Energy differences between frozen core and full core for CCSD/6-31G*

19 06 19 13 52
For ()
  Energy (hartrees)
frozen core -40.1272938
correlated core -40.1314248
difference -0.0041310
  Energy (hartrees)
frozen core -40.1454700
correlated core -40.1497223
difference -0.0042523