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

For LiMg (Lithium magnesium)

Energies in Hartree
Methods with standard basis sets
STO-3G 3-21G 3-21G* 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 -0.019926 -0.004298 -0.007461 -0.007310 -0.007310 -0.007839 -0.141527 -0.141527 -0.011475   -0.004087 -0.031085 -0.045923 -0.004453 -0.033258 -0.046695
MP3=FULL       -0.007335   -0.008231                    
Coupled Cluster CCSD(T)=FULL       -0.007565           -0.090689 -0.004208 -0.034387 -0.050400 -0.004586 -0.036769 -0.051256
STO-3G 3-21G 3-21G* 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