Fig. 3: Surface contamination by fine particles.
a Particle size distribution histogram (blue bars) with the area in μm2 and cumulative particle size curve (red) for 3175 particles b, c Mosaic of optical images displaying single particles with an area smaller than 5 µm² (left, scale bar is 2 µm) and segmented round and elongated particles (right, scale bar is 5 µm).
