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

For PN+ (phosphorus nitride 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 -0.001762 -0.007821 -0.015223 -0.004891 -0.014687 -0.014687 -0.015731 -0.142526 -0.142526 -0.030483 -0.008915 -0.054335 -0.081999 -0.083463
MP3=FULL         -0.014023                  
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