Figure 7: Occurrence number of effective lidar ratios (the product of the naturally occurring lidar ratio and the instrument-specific multiple scattering factor at each wavelength) at 532 nm and 1064 nm for African dust derived from the first two and a half years of the nighttime CALIOP data acquired over land within a geographical region of (12°N–30°N, 30°W–35°E) in the North Africa. The median/mean is 36.4/38.5 ± 9.2 sr at 532 nm and 47.7/50.3 ± 12.3 sr at 1064 nm. Figure from [210].