Hi Partha,
It should be depended  on the input model :

MIXEd
   Some atoms with isotropic, some with anisotropic B-values. In this
   case input file (PDB) defines which atom should be refined
   isotropicly and which anisotropicly. The atoms with ANISOU card are
   refined anisotropicly.
ta
   leo


Partha Chakrabarti wrote:
Hi,

Sorry to sound stupid, could someone explain what does refmac do if one chooses "mixed (bref MIXED)" or "overall (bref OVER)" B factor refinement in the context of TLS refinement?

Is it something like: Isotropic for the main chain and/or waters and anisotropic for the side chain?

Regards, Partha




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