This method is a procedure for calculating paraffin, olefin,naphthene and aromatic hydrocarbon types in hydrocarbon fractions,such as reformer feeds and reformates, having endpoints of 200�C orless (C3 through C11). C12 paraffins and naphthenes atconcentrations totaling less than 3% can be determined. Olefinsmust be less than 2%. C8 minus paraffins and naphthenes arereported individually. C9 through C12 paraffins and naphthenes aredetermined by carbon number. Aromatics through C10 are determinedindividually with C11+ aromatics determined as a composite. Olefinsare reported undistributed. If analysis by carbon number only forall hydrocarbon types over all carbon number ranges is sufficient,use ASTM Method D6839, "Hydrocarbon Types, Oxygenated Compounds,and Benzene in Spark Ignition Engine Fuels by Gas Chromatography."Results are reported to the nearest 0.01 mass-%. Conversion toliquid volume-percent (LV-%) is described in theAppendix.