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+Why Full-Width, Half Max (FWHM)?
+If you have two peaks with the same shape overlapping each other, they will
+combine into a single peak with no dip between them (aka, no concavity,
+assuming that the peak shape is convex up to the FWHM point) if they
+overlap up to the FWHM.
+While peak fitting could extract more information, the FWHM is a reasonable
+bound on the simple ability to differentiate "features" or "structure".