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

For FHF- (Hydrogen difluoride anion)

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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL -0.000019 -0.003711 -0.003711 -0.002062 -0.004141 -0.004176 -0.004781 -0.037710 -0.037794 -0.009435 -0.034171 -0.004243 -0.025969 -0.062791 -0.004610 -0.028231 -0.063574
MP3=FULL         -0.003661   -0.081997                    
Coupled Cluster CCSD(T)=FULL         -0.003716           -0.034720 -0.003823 -0.025568 -0.063896 -0.004174 -0.027912 -0.064675
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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ