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

For NF3- (Nitrogen trifluoride 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-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL -0.000184 -0.007245 -0.007245 -0.013662 -0.009224 -0.009225 -0.010851 -0.074569 -0.074570 -0.021932 -0.008788 -0.050048 -0.121296 -0.009247 -0.055443 -0.122708
MP3=FULL         -0.008423   -0.091797                  
Coupled Cluster CCSD(T)=FULL         5.609733                   -0.011680  
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-pVTZ aug-cc-pVQZ