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Energy differences between frozen core and full core for B2PLYP/3-21G

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  Energy (hartrees)
frozen core -576.6950940
correlated core -576.6987535
difference -0.0036596
  Energy (hartrees)
frozen core -576.7253142
correlated core -576.7289949
difference -0.0036807
  Energy (hartrees)
frozen core -576.7233878
correlated core -576.7270611
difference -0.0036733
  Energy (hartrees)
frozen core -576.7240227
correlated core -576.7277038
difference -0.0036811