Figure 3.
Construction of modified lawns for rational ϕ = pπ/q and p even, with p = 6 and q = 13 (a, lemma 3.8) and for irrational ϕ/π with ϕ = 1.2 (b, lemma 3.9). The caps and cups around the equator are shown as black and white dots, respectively.
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