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

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For Al2 (Aluminum diatomic)
  Energy (hartrees)
frozen core -151.6787128
correlated core -151.7222102
difference -0.0434974
  Energy (hartrees)
frozen core -151.6824441
correlated core -151.7251725
difference -0.0427284