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

For NH- (Imidogen anion)

Energies in Hartree
Methods with standard basis sets
6-31G* 6-31+G** aug-cc-pVDZ cc-pV(T+d)Z
Moller Plesset perturbation MP2=FULL     -0.002098 -0.011918
MP3=FULL -0.002628 -0.058564    
6-31G* 6-31+G** aug-cc-pVDZ cc-pV(T+d)Z