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@neu
The radii of the 27% and 0.7% circles are 21.1px and 4px respectively
The larger one is therefore roughly x28 the size of the smaller. It should be x38.57 however this would only require the radius of the smaller circle to be 0.6 px smaller, so the difference is most likely due to measurement error, and the graphic is correct.
Area of a circle is proportional to the radius squared. For a circle to be x38.5 larger, it would only need to be x6.2 wider.