# Core CIF Dictionary version 2.3

# _reflns_shell_Rmerge_I_all

### Name

`'_reflns_shell_Rmerge_I_all'`
**Category:** reflns_shell

**Data type:** numb

**Must** appear in a looped list

**Enumeration range:** 0.0 -> infinity

### Definition

The value of Rmerge(I) for all reflections in a given shell.
sum~i~ ( sum~j~ | I~j~ - | )
Rmerge(I) = --------------------------------
sum~i~ ( sum~j~ )
I~j~ = the intensity of the jth observation of reflection i
= the mean of the intensities of all observations of
reflection i
sum~i~ is taken over all reflections
sum~j~ is taken over all observations of each reflection.

**Copyright © 2003 International Union of Crystallography**
IUCr Webmaster