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Figure 1
Rose window on the south entrance (Puerta del Sarmental) of the Burgos cathedral in Northern Spain. The 20-fold pattern is rather rare. The symmetry of this rose window is C10v (or 10mm), consisting of a tenfold central symmetry (inner circle) and mirror planes of symmetry duplicating each `leaf' on the other side of each of the ten radial lines. Overall, the left side is balanced by a symmetrical equivalent on the right side. Image from the personal collection of the author.

Journal logoSTRUCTURAL
BIOLOGY
ISSN: 2059-7983
Volume 70| Part 3| March 2014| Pages 907-911
https://doi.org/10.1107/S1399004713032859
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