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Bond Length differences between CCSD(T)=FULL (all electrons correlated) and CCSD(T) (frozen core)

For BeN- atoms 1 and 2

For BeN- (Beryllium mononitride anion)
Bond length differences (full - frozen) in Å
Methods with standard basis sets
cc-pVQZ
Coupled Cluster CCSD(T)=FULL -0.0058