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Bond Length differences between FULL (all electrons correlated) and FROZEN core

Such as MP2=Frozen and MP2=Full
17 10 27 16 27

For NBr atoms 1 and 2

For NBr (nitrogen monobromide)
Bond length differences (full - frozen) in Å. Mouse over a difference for the bond length with full correlation.
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 0.0002 0.0003 0.0001 0.0009 0.0030 0.0030 0.0031 0.0016 0.0016 0.0143 -0.0002 0.0016 0.0051 0.0026 0.0023 0.0077 0.0041
MP4=FULL   0.0003     0.0034       0.0016     0.0017 0.0050   0.0023 0.0065  
Coupled Cluster CCSD=FULL         0.0040           0.0004 0.0020 0.0054 0.0034 0.0027 0.0076 0.0048
CCSD(T)=FULL         0.0039           0.0001 0.0020 0.0052 0.0032 0.0027 0.0072 0.0043
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

nbr.gif