Data Item _phasing_MIR_shell.R_cullis
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General 
- Item name
- _phasing_MIR_shell.R_cullis
- Category name
- phasing_MIR_shell
- Attribute name
- R_cullis
- Required in PDB entries
- no
- Used in current PDB entries
- No
Item Description
Residual factor Rcullis for centric reflections in this shell.
sum| |Fphobs +/- Fpobs| - Fhcalc |
Rcullis = ----------------------------------------
sum|Fphobs - Fpobs|
Fpobs = the observed structure-factor amplitude of the native
Fphobs = the observed structure-factor amplitude of the
derivative
Fhcalc = the calculated structure-factor amplitude from the
heavy-atom model
sum is taken over the specified reflections
Ref: Cullis, A. F., Muirhead, H., Perutz, M. F., Rossmann, M. G.
& North, A. C. T. (1961). Proc. R. Soc. London Ser. A,
265, 15-38.
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]+)?
Allowed Boundary Conditions
| Minimum Value | Maximum Value |
|---|---|
| 0.0 | +∞ |