Data Item _pdbx_vrpt_summary_diffraction.I_over_sigma

General

Item name
_pdbx_vrpt_summary_diffraction.I_over_sigma
Category name
pdbx_vrpt_summary_diffraction
Attribute name
I_over_sigma
Required in PDB entries
no
Used in currrent PDB entries
No

Item Description

Each reflection has an intensity (I) and an uncertainty in measurement (sigma(I)), so I/sigma(I) is the signal-to-noise ratio. This ratio decreases at higher resolution. <I/sigma(I)> is the mean of individual I/sigma(I) values. Value for outer resolution shell is given in parentheses. In case structure factor amplitudes are deposited, Xtriage estimates the intensities first and then calculates this metric. When intensities are available in the deposited file, these are converted to amplitudes and then back to intensity estimate before calculating the metric. X-ray entry specific, calculated by Phenix Xtriage program.

Data Type

Data type code
line
Data type detail
char item types / multi-word items ...
Primitive data type code
char
Regular expression
[][ \t_(),.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*

Aliases

Alias Item Name Dictionary Name Dictionary Version
_Entry.IoverSigma http://wwpdb.org/validation/schema/wwpdb_validation_v6.00.xsd V6.00