Re: [ccp4bb] AW: [ccp4bb] AW: [ccp4bb] (R)MS

2021-05-29 Thread Ethan A Merritt
On Saturday, 29 May 2021 02:12:16 PDT Gergely Katona wrote: [...snip...] I think the assumption of independent variations per atoms is too strong in many cases and does not give an accurate picture of uncertainty. [...snip...] Gergely, you are revisiting a line of thought that historically led

Re: [ccp4bb] (R)MS

2021-05-29 Thread Philippe BENAS
Dear CCP4bbers, As Zbyszek and some others wrote, the explanation of B factors is linked to the mathematical expression of structure factors: the X-ray crystallographer primary data are projections of the reciprocal space. And it's probably better to keep this primary info in PDB files rather

Re: [ccp4bb] AW: [ccp4bb] AW: [ccp4bb] (R)MS

2021-05-29 Thread Gergely Katona
Hi, It is enough to have Ų as unit to express uncertainty in 3D, but one can express it with a single number only in a very specific case when the atom is isotropic. Few atoms have a naturally isotropic distribution around their mean position in very high resolution protein crystal