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. Author manuscript; available in PMC: 2015 Feb 9.
Published in final edited form as: Combust Flame. 2013 Dec;160(12):2996–3003. doi: 10.1016/j.combustflame.2013.06.025

Fig. 2.

Fig. 2

(A) EPR spectra of particulate accumulated at sampling port C using the cryogenic method. (B) Spectrum A on expanded scale to show detail. (C) EPR spectra of particulate collected on a cellulose-ester filter at the same sampling position.