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, Figure 1. UV absorption spectra of perfluoro-2-methyl-3-pentanone (PF-2M3P), 717 perfluoro-3-methyl-2-butanone (PF-3M2B) and 2-methyl-3-pentanone (2M3P) and 718 compared with those from literature. The shaded area in yellow represents the solar 719 spectral irradiance measured inside HELIOS (13:00 local time, p.27, 2013.

, Figure 2. Perfluoro-2-methyl-3-pentanone (PF-2M3P) and its products during the 725 photolysis experiment under natural irradiation in HELIOS, 2013.