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. Author manuscript; available in PMC: 2012 Jul 1.
Published in final edited form as: Appl Comput Harmon Anal. 2011 Jul;31(1):44–58. doi: 10.1016/j.acha.2010.10.001

Figure 8.

Figure 8

Left: the orientable double covering of ℝP(2), which is S2; Middle: the orientable double covering of the Klein bottle, which is T2; Right: the orientable double covering of the Möbius strip, which is a cylinder.