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Figure 2
Two sets of 3rd order cosine waves (h′ = 3) that cross the unit cell of plane group pg along the principal axes a and b. Note that the order determines the number of full Fourier wave trains with wavelength dh′ = a,b/h′ along the line of projection. Moreover, the illustration shows that the plane waves cannot sense the position of an atom along the direction of projection (see Fig. 1[link]). This feature is essential as it allows the use of line projections for the calculations with equations 6[link] and 7[link].

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 82| Part 2| February 2026| Pages 235-243
https://doi.org/10.1107/S2056989026000745
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