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Energy differences between frozen core and full core for QCISD(TQ)/6-31G*

19 06 19 13 52
For ()
  Energy (hartrees)
frozen core -38.6555574
correlated core -38.6593585
difference -0.0038011
  Energy (hartrees)
frozen core -38.6504551
correlated core -38.6542991
difference -0.0038440