You can use harmonic restraint. There is no option on the interface.
However you can create and use keyword file on the interface.
In the keywords file you need to give instruction where you want to
put harmonic restraints. Syntax is:
for particular atom:
external harmonic chain [ch] residue
Dear CCP4BB users:
I have recently switched to use REFMAC5 instead of CNS in the final
refinement of a structure. The TLS method gave much better R/Rfree
values than did CNS (17/22 vs 25/28 at 2A).
In CNS there is a harmonic term to tether some specified atoms to
their original positions. I use t
