**Definition:**

The value of Rmerge(F) for significantly intense reflections (see _reflns.threshold_expression) in a given shell. sum~i~ ( sum~j~ | F~j~ - <F> | ) Rmerge(F) = -------------------------------- sum~i~ ( sum~j~ <F> ) F~j~ = the amplitude of the jth observation of reflection i <F> = the mean of the amplitudes 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_F_obs (alternate)

**Category:** reflns_shell

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