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Energy differences between frozen core and full core for MP2/cc-pV(T+d)Z

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For ()
  Energy (hartrees)
frozen core -1590.8352721
correlated core -1591.2406650
difference -0.4053929
  Energy (hartrees)
frozen core -1590.9033160
correlated core -1591.3076670
difference -0.4043510
  Energy (hartrees)
frozen core -1590.9033160
correlated core -1591.3076670
difference -0.4043509