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Energy differences between frozen core and full core for MP2/3-21G*

19 06 19 13 52
For ()
  Energy (hartrees)
frozen core -619.4419785
correlated core -619.4608774
difference -0.0188989
  Energy (hartrees)
frozen core -619.3804708
correlated core -619.3992285
difference -0.0187577