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

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  Energy (hartrees)
frozen core -578.1151443
correlated core -578.1230692
difference -0.0079249
  Energy (hartrees)
frozen core -578.1160297
correlated core -578.1239653
difference -0.0079356
  Energy (hartrees)
frozen core -578.0695978
correlated core -578.0775922
difference -0.0079944