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Energy differences between frozen core and full core for MP2/6-311G*

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  Energy (hartrees)
frozen core -579.0348599
correlated core -579.2829194
difference -0.2480594
  Energy (hartrees)
frozen core -579.0670269
correlated core -579.3156198
difference -0.2485929
  Energy (hartrees)
frozen core -579.0860208
correlated core -579.3350188
difference -0.2489980
  Energy (hartrees)
frozen core -579.0739566
correlated core -579.3227235
difference -0.2487669