International
Tables for
Crystallography
Volume G
Definition and exchange of crystallographic data
Edited by S. R. Hall and B. McMahon

International Tables for Crystallography (2006). Vol. G. ch. 5.3, p. 511

Section 5.3.5.2.1.2. Constraining standard uncertainties to specified ranges

B. McMahona*

a International Union of Crystallography, 5 Abbey Square, Chester CH1 2HU, England
Correspondence e-mail: bm@iucr.org

5.3.5.2.1.2. Constraining standard uncertainties to specified ranges

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Some journals require that standard uncertainties in experimental values should be quoted within a specified range. Typically the standard uncertainty (s.u.) should be quoted as an integer in parentheses, modifying the last place or two of decimals in the experimental data, and with a value between 2 and 19. cif2cif permits s.u. values in the ranges 1–9, 2–19 or 3–29, selectable by a command-line switch. The effect of applying the `rule of 19' would be to change a value of 1.458(1) in the input CIF to 1.4580(10) in the output.








































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