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

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For ()
  Energy (hartrees)
frozen core -579.1661593
correlated core -579.2996063
difference -0.1334470
  Energy (hartrees)
frozen core -579.2002051
correlated core -579.3263203
difference -0.1261151
  Energy (hartrees)
frozen core -579.2279985
correlated core -579.3569811
difference -0.1289826
  Energy (hartrees)
frozen core -579.2121832
correlated core -579.3405418
difference -0.1283586