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Energy differences between frozen core and full core for MP2/cc-pVTZ

19 06 19 13 52
For F3- (trifluoride anion)
  Energy (hartrees)
frozen core -2611.8307966
correlated core -2611.8916329
difference -0.0608363
  Energy (hartrees)
frozen core -2611.8307959
correlated core -2611.8916327
difference -0.0608368