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`Laue' symmetry
Wilson, A. J. C.  International Tables for Crystallography (2006). Vol. C, Section 1.4.3.2, p. 21 [ doi:10.1107/97809553602060000575 ]
... eleven conventional `Laue' symmetries [International Tables for Crystallography (2005), Volume A, Section 3.1.2 and elsewhere] involve the explicit assumption of Friedel ... Patterson symmetry. References International Tables for Crystallography (2005). Vol. A. Space-group symmetry, fifth ed., edited by Th. Hahn. Heidelberg: Springer. International Tables for Crystallography (2006). Vol. C, ch. 1.4, p. 21 © International Union of Crystallography 2006 | ...
     [more results from section 1.4.3 in volume C]

Symmorphic space groups
Wilson, A. J. C.  International Tables for Crystallography (2006). Vol. C, Section 1.4.2.1, p. 21 [ doi:10.1107/97809553602060000575 ]
... nothing fundamental about the nature of symmorphism; they are simply a consequence of the conventions governing the construction of symbols in ... do not contain screw axes or glide planes, this is a result of the manner in which the space-group symbols ... tables of space-group symbols. International tables for crystallography, Vol. A, edited by Th. Hahn, Part 4. Heidelberg: Springer. Wolff, ...
     [more results from section 1.4.2 in volume C]

Arithmetic crystal classes in one, two and higher dimensions
Wilson, A. J. C.  International Tables for Crystallography (2006). Vol. C, Section 1.4.1.2, p. 16 [ doi:10.1107/97809553602060000575 ]
... there are two geometric crystal classes, 1 and m, and a single Bravais lattice, . Two arithmetic crystal classes result, and ... ten geometric crystal classes, and two Bravais lattices, p and c; 13 arithmetic crystal classes result. The two-dimensional geometric and ... this volume. References Brown, H., Bülow, R., Neubüser, J., Wondratschek, H. & Zassenhaus, H. (1978). Crystallographic groups of ...
     [more results from section 1.4.1 in volume C]

Introduction
Wilson, A. J. C.  International Tables for Crystallography (2006). Vol. C, ch. 5.1, p. 490 [ doi:10.1107/97809553602060000595 ]
Chapter 5.1. Introduction A brief overview of Chapters 5.2 to 5.5 on the determination ... will be found in Klug & Alexander (1974) and Peiser, Rooksby & Wilson (1960). The proceedings of the symposium on Accuracy in ... Gaithersburg in 1979 (Block & Hubbard, 1980) are particularly valuable as a source of information on developments of all aspects of ...

Media for organic substances
Larsen, E. S. Jr, Meyrowitz, R. and Wilson, A. J. C.  International Tables for Crystallography (2006). Vol. C, Section 3.3.4, p. 161 [ doi:10.1107/97809553602060000587 ]
... refractive index of the saturated medium is then measured with a microrefractometer (Jelley, 1934, pp. 236-240). References Jelley, E. E. (1934). A microfractometer and its use in chemical microscopy. J. R. Microsc. Soc. 54, 234-245. International Tables for ...

High-index media
Larsen, E. S. Jr, Meyrowitz, R. and Wilson, A. J. C.  International Tables for Crystallography (2006). Vol. C, Section 3.3.3, pp. 160-161 [ doi:10.1107/97809553602060000587 ]
... . Above about 2.2, the index must be determined at a wavelength for which selenium is transparent; the red line of ... the determination of high refractive indices with the microscope. Am. J. Sci. 34, 42-47. International Tables for Crystallography (2006). Vol. C, ch. 3.3, pp. 160-161 © International Union of Crystallography ...

Media for general use
Larsen, E. S. Jr, Meyrowitz, R. and Wilson, A. J. C.  International Tables for Crystallography (2006). Vol. C, Section 3.3.2, p. 160 [ doi:10.1107/97809553602060000587 ]
... and generally satisfactory. They were selected because they require only a small number of liquids for their preparation. In general, each ... methylene iodide or [alpha]-bromonaphthalene for lower n) 1.814 (25°C) 7 × 10-4 Rather strong 2S, 2As2S2, 6AsBr3 (mix with 10% sulfur in AsBr3 for lower n) 2.003 (25°C) 6 × 10-4 Rather strong 2Se, 2As2S2, 6AsBr3 (mix ...

Introduction
Larsen, E. S. Jr, Meyrowitz, R. and Wilson, A. J. C.  International Tables for Crystallography (2006). Vol. C, Section 3.3.1, p. 160 [ doi:10.1107/97809553602060000587 ]
... of crystals are complex, and it is planned to include a full account in Volume D . What follows is restricted to a brief description of immersion media for use in the measurement ... or both. References International Tables for Crystallography (2006). Vol. C, ch. 3.3, p. 160 © International Union of Crystallography 2006 | ...

Optimization of counting times
Wilson, A. J. C.  International Tables for Crystallography (2006). Vol. C, Section 7.5.7, pp. 667-668 [ doi:10.1107/97809553602060000608 ]
... and Ij if , and is the variance of , , if i = j. There is very little correlation2 between successive intensity measurements in ... becomes These equations are strictly accurate only if F is a linear function of the I's, a condition satisfied for the integrated intensity, but for few ...

Treatment of measured-as-negative (and other weak) intensities
Wilson, A. J. C.  International Tables for Crystallography (2006). Vol. C, Section 7.5.6, p. 667 [ doi:10.1107/97809553602060000608 ]
... those for which the subtraction of background has resulted in a negative net intensity, at their measured values will lead to a bias in the parameters resulting from a least-squares refinement. This is, however, inconsistent with the ...

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