Absorption Coefficients of Kerogen (IMAGE) Science China Press Caption This image shows R0% (vitrinite reflectance) dependence of α (absorption coefficients) of kerogen of different maturities at selected frequencies. Credit ©Science China Press Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.