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Measured effective enthalpies (kJ mol−1) plotted against four experimental variables: precursor hydrocarbon molecular weight (g mol−1), reacted concentration of precursor hydrocarbon (ppmC), initial NOx concentration (ppb), and aerosol volume produced (nL m−3, or μg m−3 assuming unit density). Data labels indicate the oxidant precursor used in the reaction. Linear regression through all data is shown by the solid black line.
