**Definition:**

The value of Rmerge(I) for significantly intense reflections (see _reflns.threshold_expression) in a given shell. sum~i~ ( sum~j~ | I~j~ - <I> | ) Rmerge(I) = -------------------------------- sum~i~ ( sum~j~ <I> ) I~j~ = the intensity of the jth observation of reflection i <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.

**Type:** float

**Mandatory item:** no

The permitted range is [0.0, infinity)

**Related item: **_reflns_shell.Rmerge_I_obs (alternate)

**Category:** reflns_shell

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