The Index plot window is an application-wide tool that is summoned from the Tools menu. At the upper left of this window is a table where you can drop glasses dragged from the lens design Glasses window or from the glass library. The tool plots the index of refraction as a function of wavelength. The index of the first glass can be subtracted, in order to plot the difference in index between all the other glasses and the first glass.
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See also the index fitting tool