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

For C3H3N3O3 (cyanuric acid)

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 aug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.002272 -0.016195 -0.016195 -0.011107 -0.035271 -0.035841 -0.037758 -0.170414 -0.170907 -0.083241 -0.155586 -0.021833 -0.130765 -0.026001 -0.155204
MP3=FULL         -0.034017                    
MP4=FULL   -0.015433     -0.034152       -0.176211     -0.020314      
B2PLYP=FULL -0.000682 -0.004795 -0.004795 -0.003285 -0.010368 -0.010532 -0.011092 -0.048408 -0.048553 -0.023982 -0.044251 -0.006426 -0.037779 -0.007656 -0.044659
Quadratic configuration interaction QCISD(T)=FULL         -0.034043                    
QCISD(TQ)=FULL         -0.034111                    
Coupled Cluster CCSD=FULL         -0.033690                    
CCSD(T)=FULL         -0.034061                    
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 aug-cc-pVTZ