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This web page g-tol.blogspot.com states the following, "Geometrical tolerancing, engineering drawing, British and ISO standards." We saw that the webpage said " Sunday, 9 June 2013." It also said " One of the geometrical tolerance characteristics is Roundness or circularity if you are working to ASME Y14. The way in which Roundness has always been defined is that it applies to the line element created in any plane perpendicular to the axis of the feature. It makes more sense from a measurement point of view, as it will reduce measurement uncertainty."