[ccp4bb]: Constrain Metal ligand bond distance

[dtouw]

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Hello
I would like to constrain an As-S bond distance to fit known EXAFS 
data.  I tried to do this by adding a LINK card with the distance to 
the header of the PDB and turning LINK to Y, but this is not working.  
The bond distances after refinement in Refmac 5 are longer than 
expected.  How can I fix this problem?  Thanks
Debbie