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Energy differences between frozen core and full core for B2PLYP/6-31+G**

19 06 19 13 52
For CHFClI (fluorochloroiodomethane)
  Energy (hartrees)
frozen core -151.7864608
correlated core -151.7904027
difference -0.0039419
  Energy (hartrees)
frozen core -151.7894876
correlated core -151.7933132
difference -0.0038256