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When a plane light wave interacts with a small spherical particle light waves are scattered in all radial directions. The properties of the scattered waves in space and time can be predicted analytically, as originally demonstrated at length by Mie in 1908. In real ensembles such as sprays and clouds, droplet size and velocity distributions are ubiquitous. In order to get information on individual droplets in an ensemble, a short exposure image of the ensemble has to be taken using a laser and a digital camera and the frozen information has to be postprocessed and evaluated.