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Protein Data Bank exchange dictionary (pdbx) version 1.0521
_pdbx_refine_component.density_ratio_side_chain
Name:'_pdbx_refine_component.density_ratio_side_chain'
Definition:
The density ratio is similar to the density index, but summation of the density for the group is used for calculation. The ratio of density is the summation of the (2Fobs-Fcal) electron density values for the group of atoms divided by the average value for the structure. Low values (less than 0.4) of this ratio may be problematic for the group. index = [Sum~i D(xi)]/<D>_all Where: D(xi) = (2*Fobs - Fcal) <D>_all is the average value of density for the structure. The summation is for all the atoms of group.
Type: float
Mandatory item: no
Category: pdbx_refine_component