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Energy differences between frozen core and full core for QCISD(T)/cc-pV(T+d)Z

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For ()
  Energy (hartrees)
frozen core -1590.9257818
correlated core -1591.3268086
difference -0.4010268
  Energy (hartrees)
frozen core -1590.9512495
correlated core -1591.3517614
difference -0.4005119
  Energy (hartrees)
frozen core -1590.9475625
correlated core -1591.3475998
difference -0.4000373