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Energy differences between frozen core and full core for QCISD(T)/aug-cc-pVDZ

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For CH2 (Methylene)
  Energy (hartrees)
frozen core -412.6871318
correlated core -412.7031595
difference -0.0160276
  Energy (hartrees)
frozen core -412.6882750
correlated core -412.7036751
difference -0.0154001