Hello, I think you are at a mid-refinement stage (R-free mid-thirties and map 
clearly still needing a lot more fitting work to be done on it) so I would not 
worry too much about the geometry stats at this point! I should pick someone's 
brains locally on model-building and get the fit to the map as good as possible.

Best wishes, Jon Cooper. jon.b.coo...@protonmail.com

-------- Original Message --------
On 6 Aug 2020, 16:39, Silvia Napolitano wrote:

> Dear CCP4BB community,
>
> I am working on a crystal structure and I am a bit stuck with the refinement.
>
> To build the model I use Coot and to refine I use Phenix.
>
> First, I noticed that the geometry analysis of exactly the same files is 
> quite different between Coot 0.8 and Coot 0.9 (see PowerPoint attached, 
> slides 1 and 2); isn't that a bit strange?
> Anyway, I tried to fix the Ramachandran outliers, geometry, and rotamers, 
> obtaining, I think, a decent model (see PowerPoint attached, slides 3-5).
>
> However, when I input this model for refinement, the statistics and the 
> geometry obtained at the end of the refinement cycles are very bad (see 
> PowerPoint attached, slide 6). I am a very basic user, so I was wondering if 
> some of you have some suggestions on what I can do and which parameters I can 
> set for the refinement that might improve the model. I also attached the .log 
> file and the .eff file of the last refinement I performed.
>
> Many thanks in advance for your precious help!
>
> I wish you a nice evening/day.
>
> Best
>
> Silvia
>
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