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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 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) cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL -0.000849 -0.007491 -0.014974 -0.004589 0.011407 -0.014574 -0.015662 -0.119081 -0.142525 -0.030042 -0.008947 -0.053766 -0.081459 -0.082970
MP3=FULL         -0.029175                  
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