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Vitrinite reflectance histogram
A histogram presenting frequency of values versus reflectance values obtained during the reflectance determination. The histogram is probably the best means of assessing whether a coal is a blend or not because a single seam coal has a reflectance histogram which is symmetrical and covers generally only 2-3 vitrinoid types. A blend, on the other hand, is likely to cover a greater number of vitrinoid types, and present a non-symmetrical distribution. Also called a reflectogram.
