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A method to evaluate the octane number of automobile gasoline by proton magnetic resonance (PMR) has been developed. Twenty-one samples, ranging in octane number from 80 to 100, were produced by preparing different blends of gasoline bases, and the dispersion of each sample in a pattern space was examined by applying the display methods, among various pattern recognition methods, to its PMR spectrum. This report concerns the result of the study, which revealed that the octane number of a given type of automobile gasoline could be visually estimated from its PMR spectrum.

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