Explain why the transmission spectrum in Figure 19-32 is calculated from the quotient (sample transform)/(background transform) instead

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Explain why the transmission spectrum in Figure 19-32 is calculated from the quotient (sample transform)/(background transform) instead of the difference (sample transform) - (background transform).

Figure 19-32

Background interferogram Sample interferogram Retardation (8) Retardation (8) Sample transform Background transform 4 000 3 600 3 200 2 800 2 400 2 000 1 600 1200 800 400 4 000 3 600 3 200 2 800 2 400 2 000 1 600 1 200 800 400 Wavenumber (cm) Wavenumber

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