Data Item _phasing_MIR_der.power_centric
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General 
- Item name
- _phasing_MIR_der.power_centric
- Category name
- phasing_MIR_der
- Attribute name
- power_centric
- Required in PDB entries
- no
- Used in current PDB entries
- Yes, in about 0.01 % of entries
Item Description
The mean phasing power P for centric reflections for this
derivative.
sum|Fhcalc2|
P = (----------------------------)1/2
sum|Fphobs - Fphcalc|2
Fphobs = the observed structure-factor amplitude of the
derivative
Fphcalc = the calculated structure-factor amplitude of the
derivative
Fhcalc = the calculated structure-factor amplitude from the
heavy-atom model
sum is taken over the specified reflections
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 | +∞ |