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The FWHM method may be difficult to apply when the spectrum has a complex shape. Another method of specifying spectral width is a special case of
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is significant, i.e., equal to or greater than a specified fraction of the largest magnitude.
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applications, the usual method of specifying spectral width is the
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where the independent variable is wavelength, λ, and
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150:(FWHM). This is the same convention used in
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169:(λ) is a suitable radiometric quantity.
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