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Figure 15
Examples of 2D RBS space groups adopting the same labels as the corresponding 2D space groups for space crystals. A unit cell is shown in each case by a gray rectangle. The faded purple circle at each lattice site is the same as the RBS circle in Fig. 9[link](b) for the case of v = u. The blue arcs represent a series of events (an RBS spacetime flock of birds?) being observed in RBS coordinates as indicated by the axes [(\overline{x}, \overline{t}')]. Dashed black lines are glide planes, solid black lines are mirrors, yellow lines are light lines, and the black ovals represent twofold rotation axes.

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ISSN: 2053-2733
Volume 77| Part 4| July 2021| Pages 242-256
https://doi.org/10.1107/S2053273321003259
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