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

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For NSe (Silane, tetrachloro-)
  Energy (hartrees)
frozen core -151.5648164
correlated core -151.5726426
difference -0.0078261
  Energy (hartrees)
frozen core -151.5708998
correlated core -151.5784618
difference -0.0075621