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

For CNH2 (Aminomethylidyne radical)

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) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL -0.000483 -0.003299 -0.003299 -0.002333 -0.007522 -0.007857 -0.008145 -0.036698 -0.037026 -0.014250 -0.033683 -0.004335 -0.026429 -0.055922 -0.004928 -0.031253 -0.056962
MP4=FULL   -0.003130     -0.007287       -0.038343     -0.003997 -0.026934   -0.004582 -0.032130  
Coupled Cluster CCSD=FULL         -0.007165           -0.034963 -0.003907 -0.026578 -0.057734 -0.004478 -0.031762 -0.058816
CCSD(T)=FULL         -0.007259           -0.035176 -0.003966 -0.026847 -0.058284 -0.004546 -0.032037 -0.059374
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ