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Figure 6
The points of coincidence are defined by coprime pairs of integers (n,m), i.e. by fractions m/n in their irreducible forms. Plotted on the nodes of a lattice, they generate the so-called set [{\cal V}] of points visible from the origin made of the lattice points drawn in blue. Each rational row of this set, as those drawn in colors, is associated with a branch of points with the same colors in the coincidence pattern of Fig. 7[link].

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ISSN: 2053-2733
Volume 79| Part 4| July 2023| Pages 301-317
https://doi.org/10.1107/S2053273323003662
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