Data Item _pdbx_refine_component.density_index
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General 
- Item name
- _pdbx_refine_component.density_index
- Category name
- pdbx_refine_component
- Attribute name
- density_index
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
The index of density is the product of the (2Fobs-Fcal) electron
density values for the group of atoms divided by the average value
for the structure. Low values (less than 1.0) may be problematic for
model fitting.
index = [(D(xi)...D(xi))(1/N)] /<D>_all
Where :
D(xi) = (2*Fobs - Fcal)
<D>_all is the averaged value of density for the structure.
The product is for N atoms of group.
Ref: Vaguine, A.A., Richelle, J. & Wodak, S.J. (1999). Acta Cryst. D55,199-205
Data Type 
- Data type code
- float
- Data type detail
- float item types are the subset of numbers that are the floating numbers.
- Primitive data type code
- numb
- Regular expression
- -?(([0-9]+)[.]?|([0-9]*[.][0-9]+))([(][0-9]+[)])?([eE][+-]?[0-9]+)?