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Diel profiles of six source categories of HOM measured at the SMEAR II station during the spring 2012.133 This figure demonstrates how formation mechanism and oxidation conditions affect the concentrations of HOM. These six categories were separated from ambient data using positive matrix factorization. The table on the right depicts the “fingerprint” molecules of each group. Adapted with permission from ref (133). Copyright 2016 Copernicus Publications.
