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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 BeN atoms 1 and 2

For BeN (Beryllium mononitride)
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 0.0001 0.0000 0.0000 0.0001 -0.0015 0.0016 0.0019 -0.0035 0.0011 0.0073 0.0004 0.0012 0.0060 0.0039 0.0058 0.0066 0.0043
MP3=FULL         0.0119   -0.0051                    
MP4=FULL   0.0001     0.0016       0.0010     0.0011 0.0067   0.0062 0.0074  
Coupled Cluster CCSD=FULL         0.0034           0.0016 0.0021 0.0133 0.0080 0.0126 0.0136 0.0086
CCSD(T)=FULL         0.0026           0.0009 0.0022 0.0119 0.0066 0.0104 0.0120 0.0074
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

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