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

For C3H7ONO (Propyl nitrite)

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 aug-cc-pVDZ
Moller Plesset perturbation MP2=FULL -0.001769 -0.010387 -0.010387 -0.007309 -0.022800 -0.024053 -0.025262 -0.111892 -0.112893 -0.048755 -0.102524 -0.014390 -0.087637 -0.016881
MP3=FULL         -0.022097                  
Coupled Cluster CCSD(T)=FULL         4.638810             -0.013290 -0.087672  
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 aug-cc-pVDZ