This is best done by calculating  the structure factors for the part you
want to fix. (make sure the occupancies are set yo 0.8)
The REFMAC hklout will contain F SIGF etc plus FCALC PHIcalc for that bit
Define this file as your input hkl
Then refine the 20% structure (occs=0.2) with input
LABI FP=F SIGFP=SIGf  FPARTi=FCALC_80% PHIPARTi-PHIC
THis will refine the 20% part and add on the structure factors from the 80%
without any refinement of that..
Eleanor


On Tue, 5 Mar 2024 at 13:32, Martin Malý <martin.maly...@email.cz> wrote:

> Dear Marius,
>
> could the 'refinement exclude' keyword for refmac5 help?
> refinement exclude all from [residue] [chain] to [residue] [chain]
>
> Best regards,
> Martin
>
> On Tue, 2024-03-05 at 14:06 +0100, Ilme Schlichting wrote:
>
> Dear Marius,
>
> Thomas discussed this issue in great detail in the supplement of our
> recent publication
> https://www.nature.com/articles/s41586-024-07032-9
>
> Good luck,
>
> Ilme
>
> On 28/02/2024 17:43, Marius Schmidt wrote:
>
> Dear All,
> can someone quickly update me with a
> way to refine a mixture of structures in
> refmac or phenix.
> For example, the mixture consists of
> 80 % structure 1 and 20 % structure 2.
> It is important that structure 1 is kept
> fixed (is not refined) and only structure
> 2 is varied.
>
> Best
> Marius
>
>
> Marius Schmidt, Dr. rer. Nat. (habil.)
> Professor
> University of Wisconsin-Milwaukee
> Kenwood Interdisciplinary Research Complex
> Physics Department, Room 3087
> 3135 North Maryland Avenue
> Milwaukee, Wi 53211
> phone (office): 1-414-229-4338
> phone (lab): 414-229-3946
> email: smar...@uwm.edu
> https://uwm.edu/physics/people/schmidt-marius/
> <https://uwm.edu/physics/people/schmidt-marius/>
> https://sites.uwm.edu/smarius/ <https://sites.uwm.edu/smarius/>
> https://www.bioxfel.org/ <https://www.bioxfel.org/>
> Nature News and Views:
> https://www.nature.com/articles/d41586-023-00504-4
> <https://www.nature.com/articles/d41586-023-00504-4>
>
>
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