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Figure 5
The variation in the offset Δa/a as a function of n, the assumed number of formula units in the unit cell. The correct n is given in parentheses for each discussed phase. For Cu3As the use of n = 1 instead of 16 delivers no offset, for GaN the offset is ∼0.1%, and for NbC and W2C it is ∼0.3%.

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CRYSTALLOGRAPHY
ISSN: 1600-5767
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