Double SemiDiameterMarginPct
The default value of zero leaves no margin, while a margin of 5% would add 5% to the clear semi-diameter or semi-diameters of all surfaces with an automatic solve. The maximum allowed margin is 50%. The clear semi-diameter or semi-diameter margin is not added to the stop surface.
If both "percent" and "millimeters" margin values are non-zero, the percent is added first, then the lens unit margin.
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