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Energy differences between frozen core and full core for B2PLYP/6-31G(2df,p)

19 06 19 13 52
For Br2 (Bromine diatomic)
  Energy (hartrees)
frozen core -166.4098891
correlated core -166.4175732
difference -0.0076841
  Energy (hartrees)
frozen core -166.4108610
correlated core -166.4185381
difference -0.0076771