Data Item _reflns.observed_criterion_sigma_I

General

Item name
_reflns.observed_criterion_sigma_I
Category name
reflns
Attribute name
observed_criterion_sigma_I
Required in PDB entries
no
Used in current PDB entries
Yes, in about 34.4 % of entries

Item Description

The criterion used to classify a reflection as 'observed' expressed as a multiple of the value of sigma(I).

Additional Descriptive Information for Depositors

 The sigma cutoff applied to intensities in scaling of data. Xengen and scalepack use -3.

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]+)?

Advisory Boundary Conditions

Minimum Value Maximum Value
-3 4