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Vitrinoid type
These are individual reflectance measurement groupings covering a 0.1 % range, e.g. vitrinoid type V6 includes all individual reflectance measurements from 0.60-0.69% inclusive, V7 = 0.70-0.79%, V8 = 0.80-0.89%, V12 = 1.20-1.29% etc. A vitrinite reflectance histogram (also called a reflectogram) can be drawn by plotting the number of individual measurements in each vitrinoid type versus reflectance.
