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Core CIF Dictionary version 2.3

_reflns_threshold_expression

Name

'_reflns_threshold_expression'

Category: reflns

Data type: char

Related item: '_reflns_observed_criterion'
Related function: alternate

Example: 'I>2u(I)'

Definition

    	
   The threshold, usually based on multiples of u(I), u(F^2^)
   or u(F), that serves to identify significantly intense
   reflections, the number of which is given by _reflns_number_gt.
   These reflections are used in the calculation of
   _refine_ls_R_factor_gt.
 


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