Extended Data Fig. 6: Daytime oxidation effects on imaginary refractive index.
From: Shortwave absorption by wildfire smoke dominated by dark brown carbon

The spectral k values upon daytime OH· oxidation over a duration of three equivalent days. The slight fluctuations in k values of the aged plume is likely due to gas-phase oxidation of volatile organic compounds in the plume, leading to formation of secondary BrC60. The shaded regions in the plots represent errors corresponding to one standard deviation of the measurements.