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Energy differences between frozen core and full core for B2PLYP/6-31G(2df,p)

19 06 19 13 52
For CH2CClCHCH2 (1,3-Butadiene, 2-chloro-)
  Energy (hartrees)
frozen core -2074.6580294
correlated core -2074.6871892
difference -0.0291597