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

For CH2NN (diazomethane)

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-pV(T+d)Z cc-pCVDZ cc-pCVTZ
Moller Plesset perturbation MP2=FULL -0.000845 -0.005275 -0.005275 -0.003726 -0.011804 -0.012143 -0.012803 -0.056303 -0.056448 -0.024516 -0.007229 -0.043480 -0.043480 -0.107083 -0.147397
MP3=FULL         -0.469609   -0.021111                
Coupled Cluster CCSD(T)=FULL         -0.011387           -0.006693 -0.044523   -0.112584 -0.153417
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-pV(T+d)Z cc-pCVDZ cc-pCVTZ