**Definition:**

For each reflection class, the residual factors for all reflections, and for significantly intense reflections (see _reflns_threshold_expression), included in the refinement. The reflections also satisfy the resolution limits established by _reflns_class_d_res_high and _reflns_class_d_res_low. This is the conventional R factor. sum | F(obs) - F(calc) | R = ------------------------ sum | F(obs) | F(obs) = the observed structure-factor amplitudes F(calc) = the calculated structure-factor amplitudes and the sum is taken over the reflections of this class. See also _reflns_class_wR_factor_all definitions.

Appears in list containing _reflns_class_code

The permitted range is 0.0 -> infinity

**Type:** numb

**Category:** reflns_class

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