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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 KO atoms 1 and 2

For KO (Potassium monoxide)
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
Moller Plesset perturbation MP2=FULL -0.0037 0.0859   0.0000 0.1526 0.0005 0.0008 0.1605 0.0010 0.0021 0.2236
MP3=FULL         0.0005   0.0007       0.2333
MP4=FULL   0.1028     0.0005       0.0010    
B2PLYP=FULL   0.0206 0.0194 0.0000 0.0002 0.0002 0.0002 0.0003 0.0003 0.0006 0.0499
Quadratic configuration interaction QCISD(T)=FULL         0.0005            
Coupled Cluster CCSD=FULL         0.0005           0.2388
CCSD(T)=FULL         0.0005           0.2420
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP

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