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Energy differences between frozen core and full core for MP2/6-311+G(3df,2p)

19 06 19 13 52
For PF5 (Phosphorus pentafluoride)
  Energy (hartrees)
frozen core -216.7425058
correlated core -216.8318770
difference -0.0893712
  Energy (hartrees)
frozen core -216.7424855
correlated core -216.8317865
difference -0.0893010