Fig. 3.

Numbers of virions in bins with the log(relative UV intensity) shown. Particle diameters are 9 µm in (a) and (e), 5 µm in (b) and (f) and 1 µm in (c) and (g). Particles are on a surface with m=1.4 + i 0.0001. The wavelength is 260 nm for the panels on the left and 302 nm for the panels on the right. Penetration depths (δ) are stated for each panel. The area under each distribution is normalized to 1.