Stars with 18 points

data178/T22 data175/AJL1 data146/F417D data169/FIG7 data168/F142 data167/F142 data12/P136
The class is those tilings with a star polygon with 18 points. Note that there are two versions of the same tiling (both in brown). The first one is somewhat inferior since the irregular heptagon is not even approximately round as it should be. The second version is nearer to the original. The difference shows some of the problems in producing a good high-quality graphic.

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