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

19 06 19 13 52
For CF2 (silanol)
  Energy (hartrees)
frozen core -259.4245513
correlated core -259.4858246
difference -0.0612732
  Energy (hartrees)
frozen core -259.4072375
correlated core -259.4689395
difference -0.0617020