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Energy differences between frozen core and all electrons correlated.
MP2, MP3, MP4, B2PLYP, CCSD, and CCSD(T)

For CH2CH2OH (2-hydroxy ethyl radical)

Energies in Hartree
Methods with standard basis sets
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.000885 -0.005036 -0.005036 -0.003614 -0.011803 -0.012635 -0.013674 -0.055599 -0.056274 -0.022146 -0.050993 -0.007199 -0.044389 -0.008274 -0.051664
MP3=FULL         -0.011526   -0.025622                
Coupled Cluster CCSD(T)=FULL         -0.011498           -0.053247 -0.006680 -0.045336 -0.007743 -0.051480
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ