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

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For SiF2 (Silicon difluoride)
  Energy (hartrees)
frozen core -115.3918530
correlated core -115.3925326
difference -0.0006795
  Energy (hartrees)
frozen core -115.3915907
correlated core -115.3922706
difference -0.0006798