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Droplets of a water-in-oil emulsion being tracked as the drops move in a glass capillary. The images are a small section of a larger field of view taken 50 minutes apart. The superimposed traces indicate the locations of three objects tracked over time. Objects moving in from the right are assigned new numbers (enhanced online) [URL: http://dx.doi.org/10.1119/1.4935806.1][URL: http://dx.doi.org/10.1119/1.4935806.2] .
