求翻译：Checking the box next to a listed target substance results in the spectrum of the target substance in its pure form being plotted in the same window containing the test spectrum (this pure target spectrum is also automatically pre-processed according to the requirements of the model). Figure 12 illustrates this feature, which is useful for visually comparing a test spectrum with the spectrum of a target substance of a model. A blue line is used for the plot of the pure target spectrum.是什么意思？

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