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(a) Section of the infrared absorption spectrum of a wind turbine gearbox oil with different oxidation levels ranging from 3.29 A/cm to 7.03 A/cm according to ASTM E2412; (b) Section of the infrared absorption spectrum of an automotive gearbox oil contaminated with different concentrations of water ranging from 0 ppm to 1991 ppm, corresponding to ASTM E2412 readings of 8.67 A/cm to 32.7 A/cm.
