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  y(x)/y0(x)
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[Analyze]-[Convert Data]
[special]-[y(x)/y0(x)]

This item is used to calculate ratio of y(x) in a data file to y0(x) in the base curve data file. So this item is enabled when you use two or more data files in the current graph. The "y(x)/y0(x)" window opens by clicking this item. The details of the options in the window are almost the same as that in [y(x)-y0(x)].