This seems to be another name for a difference Fourier map, calculated
from F_obs - F_calc; the term omit map being used in the macromolecular
community. It shows scattering density missing in the model, i.e. from
omitted atoms.
*Von:* davide.lev...@gmail.com
*Gesendet:* Sonntag, 18. August
It should be slightly different
(https://doi.org/10.1107/S0021889887012755), see slide 9 here:
https://brockhouse.lightsource.ca/media/uploads/xrd-school-2024/introduction_to_gsas-ii.pdf
The calculation appears to be here:
https://github.com/AdvancedPhotonSource/GSAS-II/blob/0b735da79488087ee5bc
The OMIT map is calculated like a normal map, but with a certain
region of the structure being omitted when calculating Fcalc.
A usual electron density map in macromolecular crystallography is
calculated from both experimental (Fobs) and calculated (Fcalc)
structure factors. Fcalc (structure facto
