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

For PF+ (phosphorus monofluoride 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-pVQZ
Moller Plesset perturbation MP2=FULL -0.001413 -0.007883 -0.015297 -0.004786 -0.013919 -0.013919 -0.015142 -0.142717 -0.142717 -0.027366 -0.008812 -0.053892 -0.083705 -0.085081
MP3=FULL         -0.013482   -0.021572              
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-pVQZ