menucheckCIF procedure
PLAT915
PLAT915 Type_3 Test for low Friedel pair coverage in non-centro structure
This ALERT reflects the notion that a dataset should contain a sufficient number of Bijvoet (Friedel) pairs for the reliable determination of the absolute structure of a non-centrosymmetric crystal structure. A Friedel coverage that deviates significantly from 100 percent may bias/invalidate the value of the Flack parameter.
