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

For BO+ (boron monoxide cation)

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) cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVQZ cc-pV(T+d)Z
Moller Plesset perturbation MP2=FULL -0.000546 -0.002908 -0.002908 -0.002163 -0.007232 -0.007232 -0.007623 -0.035328 -0.035328 -0.012909 -0.003474 -0.023311 -0.052806 -0.004517 -0.053629 -0.023311
MP3=FULL         -0.007336   -0.009718                  
Coupled Cluster CCSD(T)=FULL         -0.007217               -0.055640   -0.056527  
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVQZ cc-pV(T+d)Z